Fix all compilation issues (?)

New features

.travis.yml

@@ -11,7 +11,7 @@ env:
     - BOARD="multi4in1:avr:multiatmega328p:bootloader=optiboot"
     - BOARD="multi4in1:avr:multixmega32d4"
     - BOARD="multi4in1:STM32F1:multistm32f103c:debug_option=none"
-    - BOARD="multi4in1:STM32F1:multistm32f103c:debug_option=native"
+   # - BOARD="multi4in1:STM32F1:multistm32f103c:debug_option=native"
     - BOARD="multi4in1:STM32F1:multistm32f103c:debug_option=ftdi"
     #
 notifications:
@@ -42,9 +42,9 @@ before_install:
       arduino --install-boards multi4in1:avr;
     fi
   #
-  - buildMulti() { exitcode=0; BUILDCMD="arduino --verify --board $BOARD Multiprotocol/Multiprotocol.ino --pref build.path=./build/"; echo $BUILDCMD; $BUILDCMD; if [ $? -ne 0 ]; then exitcode=1; fi; echo; return $exitcode; }
+  - buildMulti() { start_fold config_diff; travis_time_start; git diff Multiprotocol/_Config.h; end_fold config_diff; exitcode=0; BUILDCMD="arduino --verify --board $BOARD Multiprotocol/Multiprotocol.ino --pref build.path=./build/"; echo $BUILDCMD; $BUILDCMD; if [ $? -ne 0 ]; then exitcode=1; fi; echo; return $exitcode; }
   - buildProtocol() { exitcode=0; opt_disable $ALL_PROTOCOLS; opt_enable $1; buildMulti; if [ $? -ne 0 ]; then exitcode=1; fi; return $exitcode; }
-  - buildEachProtocol() { exitcodesum=0; for PROTOCOL in $ALL_PROTOCOLS ; do echo Building $PROTOCOL; buildProtocol $PROTOCOL; if [ $? -ne 0 ]; then exitcodesum=$((exitcodesum + 1)); fi; done; return $exitcodesum; }
+  - buildEachProtocol() { exitcodesum=0; for PROTOCOL in $ALL_PROTOCOLS ; do printf "\e[33;1mBuilding $PROTOCOL\e[0m"; buildProtocol $PROTOCOL; if [ $? -ne 0 ]; then exitcodesum=$((exitcodesum + 1)); fi; done; return $exitcodesum; }
   #
   # Arduino IDE adds a lot of noise caused by network traffic; firewall it
   - sudo iptables -P INPUT DROP
@@ -86,6 +86,12 @@ before_script:
       opt_enable FRSKYX_CC2500_INO AFHDS2A_A7105_INO MJXQ_NRF24L01_INO DSM_CYRF6936_INO;
     fi
   #
+  - export -f travis_fold
+  - export -f travis_nanoseconds
+  - export -f travis_time_start
+  - export -f travis_time_finish
+  - start_fold() { echo -e "travis_fold:start:$1"; }
+  - end_fold() { echo -e "\ntravis_fold:end:$1\r"; }
 script:
   # Build with all protocols enabled for STM32; a subset of protocols for Atmega
   - buildMulti
@@ -113,91 +119,158 @@ before_deploy:
   - cp ./_Config.h.bak Multiprotocol/_Config.h
   # Build the release files for OrangeRX
   - if [[ "$BOARD" == "multi4in1:avr:multixmega32d4" ]]; then
+      printf "\n\e[33;1mBuilding multi-orangerx-aetr-green-inv-$TRAVIS_TAG.bin\e[0m";
       opt_enable $ALL_PROTOCOLS;
       opt_disable ORANGE_TX_BLUE;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-orangerx-green-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-orangerx-aetr-green-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-orangerx-aetr-blue-inv-$TRAVIS_TAG.bin\e[0m";
       opt_enable ORANGE_TX_BLUE;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-orangerx-blue-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-orangerx-aetr-blue-inv-$TRAVIS_TAG.bin;
+      cp Multiprotocol/Multi.txt ./binaries/Multi.txt;
     fi
   # Build the release files for AVR without bootloader
   - if [[ "$BOARD" == "multi4in1:avr:multiatmega328p:bootloader=none" ]]; then
+      printf "\n\e[33;1mBuilding multi-avr-usbasp-aetr-A7105-inv-$TRAVIS_TAG.bin\e[0m";
       opt_disable CHECK_FOR_BOOTLOADER;
       opt_disable $ALL_PROTOCOLS;
       opt_enable $A7105_PROTOCOLS;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-avr-usbasp-A7105-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-avr-usbasp-aetr-A7105-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-avr-usbasp-aetr-CC2500-inv-$TRAVIS_TAG.bin\e[0m";
       opt_disable $ALL_PROTOCOLS;
       opt_enable $CC2500_PROTOCOLS;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-avr-usbasp-CC2500-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-avr-usbasp-aetr-CC2500-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-avr-usbasp-aetr-CYRF6936-inv-$TRAVIS_TAG.bin\e[0m";
       opt_disable $ALL_PROTOCOLS;
       opt_enable $CYRF6936_PROTOCOLS;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-avr-usbasp-CYRF6936-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-avr-usbasp-aetr-CYRF6936-inv-$TRAVIS_TAG.bin;
     fi
   # Build the release files for AVR with bootloader
   - if [[ "$BOARD" == "multi4in1:avr:multiatmega328p:bootloader=optiboot" ]]; then
+      printf "\n\e[33;1mBuilding multi-avr-txflash-aetr-A7105-inv-$TRAVIS_TAG.bin\e[0m";
       opt_enable CHECK_FOR_BOOTLOADER;
       opt_disable $ALL_PROTOCOLS;
       opt_enable $A7105_PROTOCOLS;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-avr-txflash-A7105-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-avr-txflash-aetr-A7105-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-avr-txflash-aetr-CC2500-inv-$TRAVIS_TAG.bin\e[0m";
       opt_disable $ALL_PROTOCOLS;
       opt_enable $CC2500_PROTOCOLS;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-avr-txflash-CC2500-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-avr-txflash-aetr-CC2500-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-avr-txflash-aetr-CYRF6936-inv-$TRAVIS_TAG.bin\e[0m";
       opt_disable $ALL_PROTOCOLS;
       opt_enable $CYRF6936_PROTOCOLS;
       buildMulti;
-      mv build/Multiprotocol.ino.hex ./binaries/multi-avr-txflash-CYRF6936-inv-$TRAVIS_TAG.hex;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-avr-txflash-aetr-CYRF6936-inv-$TRAVIS_TAG.bin;
     fi
   # Build the release files for STM32 without debug
   - if [[ "$BOARD" == "multi4in1:STM32F1:multistm32f103c:debug_option=none" ]]; then
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-aetr-inv-$TRAVIS_TAG.bin\e[0m";
       opt_enable CHECK_FOR_BOOTLOADER;
       opt_enable $ALL_PROTOCOLS;
       opt_enable MULTI_STATUS;
       opt_disable MULTI_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-inv-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-aetr-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-taer-inv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace AETR TAER;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-taer-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-reta-inv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace TAER RETA;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-reta-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-aetr-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace RETA AETR;
       opt_disable INVERT_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-noinv-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-aetr-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-taer-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace AETR TAER;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-taer-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-reta-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace TAER RETA;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-reta-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-aetr-inv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace RETA AETR;
       opt_disable MULTI_STATUS;
       opt_enable MULTI_TELEMETRY;
       opt_enable INVERT_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-inv-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-aetr-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-taer-inv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace AETR TAER;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-taer-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-reta-inv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace TAER RETA;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-reta-inv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-aetr-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace RETA AETR;
       opt_disable INVERT_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-noinv-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-aetr-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-taer-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace AETR TAER;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-taer-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-reta-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace TAER RETA;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-reta-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-ppm-aetr-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace RETA AETR;
+      opt_disable MULTI_STATUS;
+      opt_disable MULTI_TELEMETRY;
+      opt_set NBR_BANKS 5;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-ppm-aetr-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-ppm-taer-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace AETR TAER;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-ppm-taer-noinv-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-ppm-reta-noinv-$TRAVIS_TAG.bin\e[0m";
+      opt_replace TAER RETA;
+      buildMulti;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-ppm-reta-noinv-$TRAVIS_TAG.bin;
     fi
   # Build the release files for STM32 with Native USB debugging
   - if [[ "$BOARD" == "multi4in1:STM32F1:multistm32f103c:debug_option=native" ]]; then
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-aetr-inv-usbdebug-$TRAVIS_TAG.bin\e[0m";
       opt_enable CHECK_FOR_BOOTLOADER;
       opt_enable $ALL_PROTOCOLS;
       opt_enable MULTI_STATUS;
       opt_disable MULTI_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-inv-usbdebug-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-aetr-inv-usbdebug-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-aetr-inv-usbdebug-$TRAVIS_TAG.bin\e[0m";
       opt_disable MULTI_STATUS;
       opt_enable MULTI_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-inv-usbdebug-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-aetr-inv-usbdebug-$TRAVIS_TAG.bin;
     fi
   # Build the release files for STM32 with FTDI USB debugging
   - if [[ "$BOARD" == "multi4in1:STM32F1:multistm32f103c:debug_option=ftdi" ]]; then
+      printf "\n\e[33;1mBuilding multi-stm-erskytx-aetr-inv-ftdidebug-$TRAVIS_TAG.bin\e[0m";
       opt_enable CHECK_FOR_BOOTLOADER;
       opt_enable $ALL_PROTOCOLS;
       opt_enable MULTI_STATUS;
       opt_disable MULTI_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-inv-ftdidebug-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-erskytx-aetr-inv-ftdidebug-$TRAVIS_TAG.bin;
+      printf "\n\e[33;1mBuilding multi-stm-opentx-aetr-inv-ftdidebug-$TRAVIS_TAG.bin\e[0m";
       opt_disable MULTI_STATUS;
       opt_enable MULTI_TELEMETRY;
       buildMulti;
-      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-inv-ftdidebug-$TRAVIS_TAG.bin;
+      mv build/Multiprotocol.ino.bin ./binaries/multi-stm-opentx-aetr-inv-ftdidebug-$TRAVIS_TAG.bin;
     fi
 deploy:
   provider: releases

BootLoaders/package_multi_4in1_board_index.json

@@ -152,6 +152,24 @@
         ],
         "toolsDependencies": []
       },
+      {
+        "name": "Multi 4-in-1 AVR Boards",
+        "architecture": "avr",
+        "version": "1.1.0",
+        "category": "Contributed",
+        "help": {
+          "online": "https://github.com/pascallanger/DIY-Multiprotocol-TX-Module"
+        },
+        "url": "https://github.com/pascallanger/DIY-Multiprotocol-TX-Module-Boards/raw/master/archives/package_multi_4in1_avr_board_v1.1.0.tar.gz",
+        "archiveFileName": "package_multi_4in1_avr_board_v1.1.0.tar.gz",
+        "checksum": "SHA-256:7bacf2db754ceb890a203de5ce89d97aa787a9e6462debeb44cf04830859687a",
+        "size": "326431",
+        "boards": [
+          {"name": "Multi 4-in-1 (Atmega328p, 3.3V, 16MHz)"},
+          {"name": "Multi 4-in-1 (OrangeRX)"}
+        ],
+        "toolsDependencies": []
+      },
       {
         "name": "Multi 4-in-1 STM32 Board",
         "architecture": "STM32F1",
@@ -488,6 +506,27 @@
           "version": "4.8.3-2014q1"
         }]
       },
+      {
+        "name": "Multi 4-in-1 STM32 Board",
+        "architecture": "STM32F1",
+        "version": "1.1.7",
+        "category": "Contributed",
+        "help": {
+          "online": "https://github.com/pascallanger/DIY-Multiprotocol-TX-Module"
+        },
+        "url": "https://github.com/pascallanger/DIY-Multiprotocol-TX-Module-Boards/raw/master/archives/package_multi_4in1_stm32_board_v1.1.7.tar.gz",
+        "archiveFileName": "package_multi_4in1_stm32_board_v1.1.7.tar.gz",
+        "checksum": "SHA-256:37cccde7eafad3d0587d28d13d5f8b2b3244bf7c83e6819b6cb08f4f468815e2",
+        "size": "7966348",
+        "boards": [{
+          "name": "Multi 4-in-1 (STM32F103C)"
+        }],
+        "toolsDependencies": [{
+          "packager": "arduino",
+          "name": "arm-none-eabi-gcc",
+          "version": "4.8.3-2014q1"
+        }]
+      },
       {
         "name": "Multi 4-in-1 OrangeRX Board - DEPRECATED, USE MULTI 4-IN-1 AVR BOARDS PACKAGE INSTEAD",
         "architecture": "orangerx",

Multiprotocol/A7105_SPI.ino

@@ -198,6 +198,7 @@ void A7105_AdjustLOBaseFreq(uint8_t cmd)
 				#endif
 				break;
 			case PROTO_AFHDS2A:
+			case PROTO_AFHDS2A_RX:
 				#ifdef FORCE_AFHDS2A_TUNING
 					offset=(int16_t)FORCE_AFHDS2A_TUNING;
 				#endif
@@ -252,7 +253,7 @@ static void __attribute__((unused)) A7105_SetVCOBand(uint8_t vb1, uint8_t vb2)
 		A7105_WriteReg(A7105_25_VCO_SBCAL_I, vb2 | 0x08);
 }
 
-#ifdef AFHDS2A_A7105_INO
+#if defined(AFHDS2A_A7105_INO) || defined(AFHDS2A_RX_A7105_INO)
 const uint8_t PROGMEM AFHDS2A_A7105_regs[] = {
 	0xFF, 0x42 | (1<<5), 0x00, 0x25, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x01, 0x3c, 0x05, 0x00, 0x50,	// 00 - 0f
 	0x9e, 0x4b, 0x00, 0x02, 0x16, 0x2b, 0x12, 0x4f, 0x62, 0x80, 0xFF, 0xFF, 0x2a, 0x32, 0xc3, 0x1f,				// 10 - 1f
@@ -329,7 +330,7 @@ void A7105_Init(void)
 				else
 			#endif
 				{
-					#ifdef AFHDS2A_A7105_INO
+					#if defined(AFHDS2A_A7105_INO) || defined(AFHDS2A_RX_A7105_INO)
 						A7105_Regs=(uint8_t*)AFHDS2A_A7105_regs;
 					#endif
 				}

Multiprotocol/AFHDS2A_Rx_a7105.ino

@@ -0,0 +1,203 @@
+/*
+ This project is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Multiprotocol is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if defined(AFHDS2A_RX_A7105_INO)
+
+#include "iface_a7105.h" 
+
+#define AFHDS2A_RX_TXPACKET_SIZE	38
+#define AFHDS2A_RX_RXPACKET_SIZE	37
+#define AFHDS2A_RX_NUMFREQ			16
+
+enum {
+	AFHDS2A_RX_BIND1,
+	AFHDS2A_RX_BIND2,
+	AFHDS2A_RX_DATA
+};
+
+static void __attribute__((unused)) AFHDS2A_Rx_build_telemetry_packet()
+{
+	uint32_t bits = 0;
+	uint8_t bitsavailable = 0;
+	uint8_t idx = 0;
+
+	packet_in[idx++] = RX_LQI; // 0 - 130
+	packet_in[idx++] = RX_RSSI;
+	packet_in[idx++] = 0; // start channel
+	packet_in[idx++] = 14; // number of channels in packet
+	// pack channels
+	for (uint8_t i = 0; i < 14; i++) {
+		uint32_t val = packet[9+i*2] | (packet[10+i*2] << 8);
+		if (val < 860)
+			val = 860;
+		// convert ppm (860-2140) to Multi (0-2047)
+		val = min(((val-860)<<3)/5, 2047);
+
+		bits |= val << bitsavailable;
+		bitsavailable += 11;
+		while (bitsavailable >= 8) {
+			packet_in[idx++] = bits & 0xff;
+			bits >>= 8;
+			bitsavailable -= 8;
+		}
+	}
+}
+
+static uint8_t __attribute__((unused)) AFHDS2A_Rx_data_ready()
+{
+	// check if FECF+CRCF Ok
+	return !(A7105_ReadReg(A7105_00_MODE) & (1 << 5 | 1 << 6 | 1 << 0));
+}
+
+uint16_t initAFHDS2A_Rx()
+{
+	uint8_t i;
+	A7105_Init();
+	hopping_frequency_no = 0;
+	packet_count = 0;
+	rx_data_started = false;
+	rx_disable_lna = IS_POWER_FLAG_on;
+	A7105_SetTxRxMode(rx_disable_lna ? TXRX_OFF : RX_EN);
+	A7105_Strobe(A7105_RX);
+
+	if (IS_BIND_IN_PROGRESS) {
+		phase = AFHDS2A_RX_BIND1;
+	}
+	else {
+		uint16_t temp = AFHDS2A_RX_EEPROM_OFFSET;
+		for (i = 0; i < 4; i++)
+			rx_id[i] = eeprom_read_byte((EE_ADDR)temp++);
+		for (i = 0; i < AFHDS2A_RX_NUMFREQ; i++)
+			hopping_frequency[i] = eeprom_read_byte((EE_ADDR)temp++);
+		phase = AFHDS2A_RX_DATA;
+	}
+	return 1000;
+}
+
+#define AFHDS2A_RX_WAIT_WRITE 0x80
+
+uint16_t AFHDS2A_Rx_callback()
+{
+	static uint32_t pps_timer = 0;
+	static uint16_t pps_counter = 0;
+	static int8_t read_retry;
+	int16_t temp;
+	uint8_t i;
+
+#ifndef FORCE_AFHDS2A_TUNING
+	A7105_AdjustLOBaseFreq(1);
+#endif
+	if (rx_disable_lna != IS_POWER_FLAG_on) {
+		rx_disable_lna = IS_POWER_FLAG_on;
+		A7105_SetTxRxMode(rx_disable_lna ? TXRX_OFF : RX_EN);
+	}
+
+	switch(phase) {
+	case AFHDS2A_RX_BIND1:
+		if (AFHDS2A_Rx_data_ready()) {
+			A7105_ReadData(AFHDS2A_RX_TXPACKET_SIZE);
+			if ((packet[0] == 0xbb && packet[9] == 0x01) ||	(packet[0] == 0xbc && packet[9] <= 0x02)) {
+				memcpy(rx_id, &packet[1], 4); // TX id actually
+				memcpy(hopping_frequency, &packet[11], AFHDS2A_RX_NUMFREQ);
+				phase = AFHDS2A_RX_BIND2;
+			}
+		}
+		A7105_WriteReg(A7105_0F_PLL_I, (packet_count++ & 1) ? 0x0D : 0x8C); // bind channels
+		A7105_SetTxRxMode(RX_EN);
+		A7105_Strobe(A7105_RX);
+		return 10000;
+
+	case AFHDS2A_RX_BIND2:
+		// got 2nd bind packet from tx ?
+		if (AFHDS2A_Rx_data_ready()) {
+			A7105_ReadData(AFHDS2A_RX_TXPACKET_SIZE);
+			if ((packet[0] == 0xBC && packet[9] == 0x02 && packet[10] == 0x00) &&
+				(memcmp(rx_id, &packet[1], 4) == 0) &&
+				(memcmp(rx_tx_addr, &packet[5], 4) == 0)) {
+				// save tx info to eeprom
+				temp = AFHDS2A_RX_EEPROM_OFFSET;
+				for (i = 0; i < 4; i++)
+					eeprom_write_byte((EE_ADDR)temp++, rx_id[i]);
+				for (i = 0; i < AFHDS2A_RX_NUMFREQ; i++)
+					eeprom_write_byte((EE_ADDR)temp++, hopping_frequency[i]);
+				BIND_DONE;
+				phase = AFHDS2A_RX_DATA;
+				return 3850;
+			}
+		}
+
+		// transmit response packet
+		packet[0] = 0xBC;
+		memcpy(&packet[1], rx_id, 4);
+		memcpy(&packet[5], rx_tx_addr, 4);
+		packet[9] = 0x01;
+		packet[10] = 0x00;
+		memset(&packet[11], 0xFF, 26);
+		A7105_WriteData(AFHDS2A_RX_RXPACKET_SIZE, packet_count++ & 1 ? 0x0D : 0x8C);
+		phase |= AFHDS2A_RX_WAIT_WRITE;
+		return 1700;
+	
+	case AFHDS2A_RX_BIND2 | AFHDS2A_RX_WAIT_WRITE:
+		//Wait for TX completion
+		pps_timer = micros();
+		while (micros() - pps_timer < 700) // Wait max 700µs, using serial+telemetry exit in about 120µs
+			if (!(A7105_ReadReg(A7105_00_MODE) & 0x01))
+				break;
+		A7105_Strobe(A7105_RX);
+		phase &= ~AFHDS2A_RX_WAIT_WRITE;
+		return 10000;
+	
+	case AFHDS2A_RX_DATA:
+		if (AFHDS2A_Rx_data_ready()) {
+			A7105_ReadData(AFHDS2A_RX_TXPACKET_SIZE);
+			if (memcmp(&packet[1], rx_id, 4) == 0 && memcmp(&packet[5], rx_tx_addr, 4) == 0) {
+				if (packet[0] == 0x58 && packet[37] == 0x00 && telemetry_link == 0) { // standard packet, send channels to TX
+					int rssi = min(A7105_ReadReg(A7105_1D_RSSI_THOLD),160);
+					RX_RSSI = map16b(rssi, 160, 8, 0, 128);
+					AFHDS2A_Rx_build_telemetry_packet();
+					telemetry_link = 1;
+				}
+				rx_data_started = true;
+				read_retry = 10; // hop to next channel
+				pps_counter++;
+			}
+		}
+		
+		// packets per second
+		if (millis() - pps_timer >= 1000) {
+			pps_timer = millis();
+			debugln("%d pps", pps_counter);
+			RX_LQI = pps_counter / 2;
+			pps_counter = 0;
+		}
+
+		// frequency hopping
+		if (read_retry++ >= 10) {
+			hopping_frequency_no++;
+			if(hopping_frequency_no >= AFHDS2A_RX_NUMFREQ)
+				hopping_frequency_no = 0;
+			A7105_WriteReg(A7105_0F_PLL_I, hopping_frequency[hopping_frequency_no]);
+			A7105_Strobe(A7105_RX);
+			if (rx_data_started)
+				read_retry = 0;
+			else
+				read_retry = -127; // retry longer until first packet is catched
+		}
+		return 385;
+	}
+	return 3850; // never reached
+}
+
+#endif

Multiprotocol/AFHDS2A_a7105.ino

@@ -90,14 +90,14 @@ static void AFHDS2A_update_telemetry()
 	#ifdef AFHDS2A_FW_TELEMETRY
 		if (option & 0x80)
 		{// forward 0xAA and 0xAC telemetry to TX, skip rx and tx id to save space
-			pkt[0]= TX_RSSI;
+			packet_in[0]= TX_RSSI;
 			debug("T(%02X)=",packet[0]);
 			for(uint8_t i=9;i < AFHDS2A_RXPACKET_SIZE; i++)
 			{
-				pkt[i-8]=packet[i];
+				packet_in[i-8]=packet[i];
 				debug(" %02X",packet[i]);
 			}
-			pkt[29]=packet[0];	// 0xAA Normal telemetry, 0xAC Extended telemetry
+			packet_in[29]=packet[0];	// 0xAA Normal telemetry, 0xAC Extended telemetry
 			telemetry_link=2;
 			debugln("");
 			return;
@@ -122,7 +122,8 @@ static void AFHDS2A_update_telemetry()
 						telemetry_link=1;
 						break;
 					case AFHDS2A_SENSOR_RX_ERR_RATE:
-						RX_LQI=packet[index+2];
+						if(packet[index+2]<=100)
+							RX_LQI=packet[index+2];
 						break;
 					case AFHDS2A_SENSOR_RX_RSSI:
 						RX_RSSI = -packet[index+2];
@@ -264,11 +265,15 @@ uint16_t ReadAFHDS2A()
 				A7105_ReadData(AFHDS2A_RXPACKET_SIZE);
 				if(packet[0] == 0xbc && packet[9] == 0x01)
 				{
-					uint8_t temp=AFHDS2A_EEPROM_OFFSET+RX_num*4;
+					uint8_t addr;
+					if(RX_num<16)
+						addr=AFHDS2A_EEPROM_OFFSET+RX_num*4;
+					else
+						addr=AFHDS2A_EEPROM_OFFSET2+(RX_num-16)*4;
 					for(uint8_t i=0; i<4; i++)
 					{
 						rx_id[i] = packet[5+i];
-						eeprom_write_byte((EE_ADDR)(temp+i),rx_id[i]);
+						eeprom_write_byte((EE_ADDR)(addr+i),rx_id[i]);
 					}
 					phase = AFHDS2A_BIND4;
 					packet_count++;
@@ -316,6 +321,9 @@ uint16_t ReadAFHDS2A()
 			packet_type = AFHDS2A_PACKET_STICKS;
 			phase = AFHDS2A_DATA;
 		case AFHDS2A_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(3850);
+			#endif
 			AFHDS2A_build_packet(packet_type);
 			if((A7105_ReadReg(A7105_00_MODE) & 0x01))		// Check if something has been received...
 				data_rx=0;
@@ -330,7 +338,10 @@ uint16_t ReadAFHDS2A()
 			{
 				#ifdef FAILSAFE_ENABLE
 					if(!(packet_counter % 1569) && IS_FAILSAFE_VALUES_on)
+					{
 						packet_type = AFHDS2A_PACKET_FAILSAFE;
+						FAILSAFE_VALUES_off;
+					}
 					else
 				#endif
 						packet_type = AFHDS2A_PACKET_STICKS;		// todo : check for settings changes
@@ -344,13 +355,19 @@ uint16_t ReadAFHDS2A()
 					if(packet[0] == 0xAA || packet[0] == 0xAC)
 					{
 						if(!memcmp(&packet[1], rx_tx_addr, 4))
-						{ // Validate TX address
+						{ // TX address validated
 							#ifdef AFHDS2A_LQI_CH
-								for(uint8_t sensor=0; sensor<7; sensor++)
-								{//read LQI value for RX output
-									uint8_t index = 9+(4*sensor);
-									if(packet[index]==AFHDS2A_SENSOR_RX_ERR_RATE)
-										RX_LQI=packet[index+2];
+								if(packet[0]==0xAA && packet[9]!=0xFD)
+								{// Normal telemetry packet
+									for(uint8_t sensor=0; sensor<7; sensor++)
+									{//read LQI value for RX output
+										uint8_t index = 9+(4*sensor);
+										if(packet[index]==AFHDS2A_SENSOR_RX_ERR_RATE && packet[index+2]<=100)
+										{
+											RX_LQI=packet[index+2];
+											break;
+										}
+									}
 								}
 							#endif
 							#if defined(AFHDS2A_FW_TELEMETRY) || defined(AFHDS2A_HUB_TELEMETRY)
@@ -390,14 +407,15 @@ uint16_t initAFHDS2A()
 	{
 		phase = AFHDS2A_DATA_INIT;
 		//Read RX ID from EEPROM based on RX_num, RX_num must be uniq for each RX
-		uint8_t temp=AFHDS2A_EEPROM_OFFSET+RX_num*4;
+		uint8_t addr;
+		if(RX_num<16)
+			addr=AFHDS2A_EEPROM_OFFSET+RX_num*4;
+		else
+			addr=AFHDS2A_EEPROM_OFFSET2+(RX_num-16)*4;
 		for(uint8_t i=0;i<4;i++)
-			rx_id[i]=eeprom_read_byte((EE_ADDR)(temp+i));
+			rx_id[i]=eeprom_read_byte((EE_ADDR)(addr+i));
 	}
 	hopping_frequency_no = 0;
-#if defined(AFHDS2A_FW_TELEMETRY) || defined(AFHDS2A_HUB_TELEMETRY)
-	init_frskyd_link_telemetry();
-#endif
 	return 50000;
 }
 #endif

Multiprotocol/ASSAN_nrf24l01.ino

@@ -127,6 +127,9 @@ uint16_t ASSAN_callback()
 			phase=ASSAN_DATA2;
 			return 2000;
 		case ASSAN_DATA2:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(12000);
+			#endif
 		case ASSAN_DATA3:
 			ASSAN_send_packet();
 			phase++;	// DATA 3 or 4

Multiprotocol/BUGSMINI_nrf24l01.ino

@@ -181,7 +181,7 @@ static void __attribute__((unused)) BUGSMINI_make_address()
     uint8_t start, length, index;
 
 	//read rxid
-	uint8_t base_adr=BUGSMINI_EEPROM_OFFSET+RX_num*2;
+	uint8_t base_adr=BUGSMINI_EEPROM_OFFSET+(RX_num&0x0F)*2;
     uint8_t rxid_high = eeprom_read_byte((EE_ADDR)(base_adr+0));
     uint8_t rxid_low  = eeprom_read_byte((EE_ADDR)(base_adr+1));
     
@@ -272,7 +272,7 @@ uint16_t BUGSMINI_callback()
 			if( NRF24L01_ReadReg(NRF24L01_07_STATUS) & _BV(NRF24L01_07_RX_DR))
 			{ // RX fifo data ready
 				XN297_ReadPayload(packet, BUGSMINI_RX_PAYLOAD_SIZE);
-				base_adr=BUGSMINI_EEPROM_OFFSET+RX_num*2;
+				base_adr=BUGSMINI_EEPROM_OFFSET+(RX_num&0x0F)*2;
 				eeprom_write_byte((EE_ADDR)(base_adr+0),packet[1]);	// Save rxid in EEPROM
 				eeprom_write_byte((EE_ADDR)(base_adr+1),packet[2]);	// Save rxid in EEPROM
 				NRF24L01_SetTxRxMode(TXRX_OFF);
@@ -299,6 +299,9 @@ uint16_t BUGSMINI_callback()
 			phase = BUGSMINI_BIND1;
 			return BUGSMINI_PACKET_INTERVAL - BUGSMINI_WRITE_WAIT;
 		case BUGSMINI_DATA1:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(BUGSMINI_PACKET_INTERVAL);
+			#endif
 			if( NRF24L01_ReadReg(NRF24L01_07_STATUS) & _BV(NRF24L01_07_RX_DR))
 			{ // RX fifo data ready => read only 12 bytes to not overwrite channel change flag
 				XN297_ReadPayload(packet, 12);
@@ -375,9 +378,6 @@ uint16_t initBUGSMINI()
 	armed = 0;
 	arm_flags = BUGSMINI_FLAG_DISARM;    // initial value from captures
 	arm_channel_previous = BUGSMINI_CH_SW_ARM;
-	#ifdef BUGS_HUB_TELEMETRY
-		init_frskyd_link_telemetry();
-	#endif
 	return BUGSMINI_INITIAL_WAIT;
 }
 

Multiprotocol/Bayang_nrf24l01.ino

@@ -283,7 +283,12 @@ uint16_t BAYANG_callback()
 	if(IS_BIND_DONE)
 	{
 		if(packet_count==0)
+		{
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync((option & BAYANG_OPTION_FLAG_TELEMETRY)?5*BAYANG_PACKET_PERIOD:2*BAYANG_PACKET_PERIOD);
+			#endif
 			BAYANG_send_packet(0);
+		}
 		packet_count++;
 		#ifdef BAYANG_HUB_TELEMETRY
 			if (option & BAYANG_OPTION_FLAG_TELEMETRY)
@@ -349,10 +354,6 @@ uint16_t initBAYANG(void)
 	BAYANG_initialize_txid();
 	BAYANG_init();
 	packet_count=0;
-	#ifdef BAYANG_HUB_TELEMETRY
-		init_frskyd_link_telemetry();
-		telemetry_lost=1;	// do not send telemetry to TX right away until we have a TX_RSSI value to prevent warning message...
-	#endif
 	return BAYANG_INITIAL_WAIT+BAYANG_PACKET_PERIOD;
 }
 

Multiprotocol/Binary_Signature.ino

@@ -0,0 +1,184 @@
+/*
+ This project is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Multiprotocol is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/************************/
+/** Firmware Signature **/
+/************************/
+
+/*
+The firmware signature is appended to the compiled binary image in order to provide information
+about the options used to compile the firmware file.  This information is then used by Multi-module 
+flashing tools to verify that the image is correct / valid.
+
+In order for the build process to determine the options used to build the firmware this file conditionally
+declares 'flag' variables for the options we are interested in.
+
+When the pre-compiler parses the source code these variables are either present or not in the parsed cpp file,
+typically '$build_dir$/preproc/ctags_target_for_gcc_minus_e.cpp'.
+
+Once the .bin file is created an additional command-line build tool scans the parsed cpp file, detects the
+flags, assembles the signature, and finally appends the signature to the end of the binary file.
+
+The signature is 24 bytes long:
+multi-x[8-byte hex code]-[8-byte version number]
+
+For example:
+multi-x1234abcd-01020199
+
+The 8-byte hex code is a 32-bit bitmask value indicating the configuration options, currently:
+
+Bit(s)  Bitmask    Option                  Comment
+1-2     0x3        Module type             Read as a two-bit value indicating a number from 0-3 which maps to a module type (AVR, STM32, OrangeRX)
+3-7     0x7C       Channel order           Read as a five-bit value indicating a number from 0-23 which maps to as channel order (AETR, TAER, RETA, etc) (right-shift two bits to read)
+8       0x80       Bootloader support      Indicates whether or not the firmware was built with support for the bootloader
+9       0x100      CHECK_FOR_BOOTLOADER    Indicates if CHECK_FOR_BOOTLOADER is defined
+10      0x200      INVERT_TELEMETRY        Indicates if INVERT_TELEMETRY is defined
+11      0x400      MULTI_STATUS            Indicates if MULTI_STATUS is defined
+12      0x800      MULTI_TELEMETRY         Indicates if MULTI_TELEMETRY is defined
+13      0x1000     DEBUG_SERIAL            Indicates if DEBUG_SERIAL is defined
+
+The 8-byte version number is the version number zero-padded to a fixed width of two-bytes per segment and no separator.  
+E.g. 1.2.3.45 becomes 01020345.
+
+Multi Telemetery Type can be read from bits 11 and 12 using the bitmask 0xC00 and right-shifting ten bits:
+Telemetry Type    Decimal Value   Binary Value
+Undefined         0               00
+erSkyTX           1               01
+OpenTX            2               10
+
+Module types are mapped to the following decimal / binary values:
+Module Type       Decimal Value   Binary Valsue
+AVR               0               00
+STM32             1               01
+OrangeRX          2               10
+
+Channel orders are mapped to the following decimal / binary values:
+Channel Order	  Decimal Value	  Binary Value
+AETR	          0	              00000
+AERT	          1	              00001
+ARET	          2	              00010
+ARTE	          3	              00011
+ATRE	          4	              00100
+ATER	          5	              00101
+EATR	          6	              00110
+EART	          7	              00111
+ERAT	          8	              01000
+ERTA	          9	              01001
+ETRA	          10	          01010
+ETAR	          11	          01011
+TEAR	          12	          01100
+TERA	          13	          01101
+TREA	          14	          01110
+TRAE	          15	          01111
+TARE	          16	          10000
+TAER	          17	          10001
+RETA	          18	          10010
+REAT	          19	          10011
+RAET	          20	          10100
+RATE	          21	          10101
+RTAE	          22	          10110
+RTEA	          23	          10111
+*/
+ 
+// Set the flags for detecting and writing the firmware signature
+#if defined (CHECK_FOR_BOOTLOADER)
+    bool firmwareFlag_CHECK_FOR_BOOTLOADER = true;
+#endif
+#if defined (INVERT_TELEMETRY)
+    bool firmwareFlag_INVERT_TELEMETRY = true;
+#endif
+#if defined (MULTI_STATUS)
+    bool firmwareFlag_MULTI_STATUS = true;
+#endif
+#if defined (MULTI_TELEMETRY)
+    bool firmwareFlag_MULTI_TELEMETRY = true;
+#endif
+#if defined (DEBUG_SERIAL)
+    bool firmwareFlag_DEBUG_SERIAL = true;
+#endif
+
+// Channel order flags
+#if defined (AETR)
+    bool firmwareFlag_ChannelOrder_AETR = true;
+#endif
+#if defined (AERT)
+    bool firmwareFlag_ChannelOrder_AERT = true;
+#endif
+#if defined (ARET)
+    bool firmwareFlag_ChannelOrder_ARET = true;
+#endif
+#if defined (ARTE)
+    bool firmwareFlag_ChannelOrder_ARTE = true;
+#endif
+#if defined (ATRE)
+    bool firmwareFlag_ChannelOrder_ATRE = true;
+#endif
+#if defined (ATER)
+    bool firmwareFlag_ChannelOrder_ATER = true;
+#endif
+#if defined (EATR)
+    bool firmwareFlag_ChannelOrder_EATR = true;
+#endif
+#if defined (EART)
+    bool firmwareFlag_ChannelOrder_EART = true;
+#endif
+#if defined (ERAT)
+    bool firmwareFlag_ChannelOrder_ERAT = true;
+#endif
+#if defined (ERTA)
+    bool firmwareFlag_ChannelOrder_ERTA = true;
+#endif
+#if defined (ETRA)
+    bool firmwareFlag_ChannelOrder_ETRA = true;
+#endif
+#if defined (ETAR)
+    bool firmwareFlag_ChannelOrder_ETAR = true;
+#endif
+#if defined (TEAR)
+    bool firmwareFlag_ChannelOrder_TEAR = true;
+#endif
+#if defined (TERA)
+    bool firmwareFlag_ChannelOrder_TERA = true;
+#endif
+#if defined (TREA)
+    bool firmwareFlag_ChannelOrder_TREA = true;
+#endif
+#if defined (TRAE)
+    bool firmwareFlag_ChannelOrder_TRAE = true;
+#endif
+#if defined (TARE)
+    bool firmwareFlag_ChannelOrder_TARE = true;
+#endif
+#if defined (TAER)
+    bool firmwareFlag_ChannelOrder_TAER = true;
+#endif
+#if defined (RETA)
+    bool firmwareFlag_ChannelOrder_RETA = true;
+#endif
+#if defined (REAT)
+    bool firmwareFlag_ChannelOrder_REAT = true;
+#endif
+#if defined (RAET)
+    bool firmwareFlag_ChannelOrder_RAET = true;
+#endif
+#if defined (RATE)
+    bool firmwareFlag_ChannelOrder_RATE = true;
+#endif
+#if defined (RTAE)
+    bool firmwareFlag_ChannelOrder_RTAE = true;
+#endif
+#if defined (RTEA)
+    bool firmwareFlag_ChannelOrder_RTEA = true;
+#endif

Multiprotocol/Bugs_a7105.ino

@@ -284,7 +284,7 @@ static void  __attribute__((unused))BUGS_set_radio_data()
 	{
 		offset=BUGS_NUM_RFCHAN;
 		// Read radio_id from EEPROM
-		uint8_t base_adr=BUGS_EEPROM_OFFSET+RX_num*2;
+		uint8_t base_adr=BUGS_EEPROM_OFFSET+(RX_num&0x0F)*2;
 		uint16_t rxid=0;
 		for(uint8_t i=0; i<2; i++)
 			rxid|=eeprom_read_byte((EE_ADDR)(base_adr+i))<<(i*8);
@@ -374,7 +374,7 @@ uint16_t ReadBUGS(void)
 			BIND_DONE;
 			// set radio_id
 			rxid = (packet[1] << 8) + packet[2];
-			base_adr=BUGS_EEPROM_OFFSET+RX_num*2;
+			base_adr=BUGS_EEPROM_OFFSET+(RX_num&0x0F)*2;
 			for(uint8_t i=0; i<2; i++)
 				eeprom_write_byte((EE_ADDR)(base_adr+i),rxid>>(i*8));	// Save rxid in EEPROM
 			BUGS_set_radio_data();
@@ -385,6 +385,9 @@ uint16_t ReadBUGS(void)
 			break;
 
 		case BUGS_DATA_1:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(BUGS_PACKET_PERIOD);
+			#endif
 			A7105_SetPower();
 			BUGS_build_packet(0);
 			A7105_WriteReg(A7105_03_FIFOI, BUGS_FIFO_SIZE_TX);
@@ -437,7 +440,7 @@ uint16_t ReadBUGS(void)
 uint16_t initBUGS(void)
 {
 	uint16_t rxid=0;
-	uint8_t base_adr=BUGS_EEPROM_OFFSET+RX_num*2;
+	uint8_t base_adr=BUGS_EEPROM_OFFSET+(RX_num&0x0F)*2;
 	for(uint8_t i=0; i<2; i++)
 		rxid|=eeprom_read_byte((EE_ADDR)(base_adr+i))<<(i*8);
 	if(rxid==0xffff)
@@ -456,9 +459,6 @@ uint16_t initBUGS(void)
 	armed = 0;
 	arm_flags = BUGS_FLAG_DISARM;		// initial value from captures
 	arm_channel_previous = BUGS_CH_SW_ARM;
-	#ifdef BUGS_HUB_TELEMETRY
-		init_frskyd_link_telemetry();
-	#endif
 
 	return 10000;
 }

Multiprotocol/CABELL_nrf224l01.ino

@@ -406,9 +406,12 @@ uint16_t CABELL_callback()
 	if (IS_BIND_DONE)
 	{
 		CABELL_send_packet(0);  // packet_period is set/adjusted in CABELL_send_packet
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		return packet_period;
 	}
-	if (bind_counter == 0)
+	else if (bind_counter == 0)
 	{
 		BIND_DONE;
 		CABELL_init();   // non-bind address 
@@ -429,10 +432,6 @@ uint16_t initCABELL(void)
 	else  
 		bind_counter = CABELL_BIND_COUNT;
 	CABELL_init();
-	#if defined CABELL_HUB_TELEMETRY 
-		init_frskyd_link_telemetry();
-		telemetry_lost=1;				// do not send telemetry to TX right away until we have a TX_RSSI value to prevent warning message...
-	#endif
 
 	packet_period = CABELL_PACKET_PERIOD;
 

Multiprotocol/CFlie_nrf24l01.ino

@@ -97,7 +97,7 @@ static inline uint8_t crtp_create_header(uint8_t port, uint8_t channel)
 #define TX_ADDR_SIZE 5
 
 // Timeout for callback in uSec, 10ms=10000us for Crazyflie
-#define PACKET_PERIOD 10000
+#define CFLIE_PACKET_PERIOD 10000
 
 #define MAX_PACKET_SIZE 32  // CRTP is 32 bytes
 
@@ -781,7 +781,10 @@ static uint16_t cflie_callback()
         break;
 
     case CFLIE_DATA:
-        // if (Model.proto_opts[PROTOOPTS_TELEMETRY] == TELEM_ON_CRTPLOG) {
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(CFLIE_PACKET_PERIOD);
+		#endif
+		// if (Model.proto_opts[PROTOOPTS_TELEMETRY] == TELEM_ON_CRTPLOG) {
         //     update_telemetry_crtplog();
         // } else if (Model.proto_opts[PROTOOPTS_TELEMETRY] == TELEM_ON_ACKPKT) {
         //     update_telemetry_ackpkt();
@@ -792,7 +795,7 @@ static uint16_t cflie_callback()
         send_cmd_packet();
         break;
     }
-    return PACKET_PERIOD;                  // Packet at standard protocol interval
+    return CFLIE_PACKET_PERIOD;                  // Packet at standard protocol interval
 }
 
 // Generate address to use from TX id and manufacturer id (STM32 unique id)

Multiprotocol/CG023_nrf24l01.ino

@@ -138,7 +138,12 @@ static void __attribute__((unused)) CG023_init()
 uint16_t CG023_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		CG023_send_packet(0);
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/CX10_nrf24l01.ino

@@ -229,6 +229,9 @@ uint16_t CX10_callback()
 			}
 			break;
 		case CX10_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(packet_period);
+			#endif
 			CX10_Write_Packet(0);
 			break;
 	}

Multiprotocol/Convert.ino

@@ -0,0 +1,142 @@
+/*
+ This project is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Multiprotocol is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/************************/
+/**  Convert routines  **/
+/************************/
+// Reverse a channel and store it
+void reverse_channel(uint8_t num)
+{
+	uint16_t val=2048-Channel_data[num];
+	if(val>=2048) val=2047;
+	Channel_data[num]=val;
+}
+
+// Channel value is converted to ppm 860<->2140 -125%<->+125% and 988<->2012 -100%<->+100%
+uint16_t convert_channel_ppm(uint8_t num)
+{
+	uint16_t val=Channel_data[num];
+	return (((val<<2)+val)>>3)+860;				//value range 860<->2140 -125%<->+125%
+}
+
+// Channel value 100% is converted to 10bit values 0<->1023
+uint16_t convert_channel_10b(uint8_t num)
+{
+	uint16_t val=Channel_data[num];
+	val=((val<<2)+val)>>3;
+	if(val<=128) return 0;
+	if(val>=1152) return 1023;
+	return val-128;
+}
+
+// Channel value 100% is converted to 8bit values 0<->255
+uint8_t convert_channel_8b(uint8_t num)
+{
+	uint16_t val=Channel_data[num];
+	val=((val<<2)+val)>>5;
+	if(val<=32) return 0;
+	if(val>=288) return 255;
+	return val-32;
+}
+
+// Channel value 100% is converted to 8b with deadband
+uint8_t convert_channel_8b_limit_deadband(uint8_t num,uint8_t min,uint8_t mid, uint8_t max, uint8_t deadband)
+{
+	uint16_t val=limit_channel_100(num);		// 204<->1844
+	uint16_t db_low=CHANNEL_MID-deadband, db_high=CHANNEL_MID+deadband; // 1024+-deadband
+	int32_t calc;
+	uint8_t out;
+	if(val>=db_low && val<=db_high)
+		return mid;
+	else if(val<db_low)
+	{
+		val-=CHANNEL_MIN_100;
+		calc=mid-min;
+		calc*=val;
+		calc/=(db_low-CHANNEL_MIN_100);
+		out=calc;
+		out+=min;
+	}
+	else
+	{
+		val-=db_high;
+		calc=max-mid;
+		calc*=val;
+		calc/=(CHANNEL_MAX_100-db_high+1);
+		out=calc;
+		out+=mid;
+		if(max>min) out++; else out--;
+	}
+	return out;
+}
+
+// Channel value 100% is converted to value scaled
+int16_t convert_channel_16b_limit(uint8_t num,int16_t min,int16_t max)
+{
+	int32_t val=limit_channel_100(num);			// 204<->1844
+	val=(val-CHANNEL_MIN_100)*(max-min)/(CHANNEL_MAX_100-CHANNEL_MIN_100)+min;
+	return (uint16_t)val;
+}
+
+// Channel value -125%<->125% is scaled to 16bit value with no limit
+int16_t convert_channel_16b_nolimit(uint8_t num, int16_t min, int16_t max)
+{
+	int32_t val=Channel_data[num];				// 0<->2047
+	val=(val-CHANNEL_MIN_100)*(max-min)/(CHANNEL_MAX_100-CHANNEL_MIN_100)+min;
+	return (uint16_t)val;
+}
+
+// Channel value is converted sign + magnitude 8bit values
+uint8_t convert_channel_s8b(uint8_t num)
+{
+	uint8_t ch;
+	ch = convert_channel_8b(num);
+	return (ch < 128 ? 127-ch : ch);	
+}
+
+// Channel value is limited to 100%
+uint16_t limit_channel_100(uint8_t num)
+{
+	if(Channel_data[num]>=CHANNEL_MAX_100)
+		return CHANNEL_MAX_100;
+	if (Channel_data[num]<=CHANNEL_MIN_100)
+		return CHANNEL_MIN_100;
+	return Channel_data[num];
+}
+
+// Channel value is converted for HK310
+void convert_channel_HK310(uint8_t num, uint8_t *low, uint8_t *high)
+{
+	uint16_t temp=0xFFFF-(3440+((Channel_data[num]*5)>>1))/3;
+	*low=(uint8_t)(temp&0xFF);
+	*high=(uint8_t)(temp>>8);
+}
+
+#ifdef FAILSAFE_ENABLE
+// Failsafe value is converted for HK310
+void convert_failsafe_HK310(uint8_t num, uint8_t *low, uint8_t *high)
+{
+	uint16_t temp=0xFFFF-(3440+((Failsafe_data[num]*5)>>1))/3;
+	*low=(uint8_t)(temp&0xFF);
+	*high=(uint8_t)(temp>>8);
+}
+#endif
+
+// Channel value for FrSky (PPM is multiplied by 1.5)
+uint16_t convert_channel_frsky(uint8_t num)
+{
+	uint16_t val=Channel_data[num];
+	return ((val*15)>>4)+1290;
+}

Multiprotocol/Corona_cc2500.ino

@@ -258,6 +258,9 @@ static uint16_t __attribute__((unused)) CORONA_build_packet()
 
 uint16_t ReadCORONA()
 {
+	#ifdef MULTI_SYNC
+		telemetry_set_input_sync(22000);
+	#endif
 	// Tune frequency if it has been changed
 	if ( prev_option != option )
 	{

Multiprotocol/DM002_nrf24l01.ino

@@ -113,7 +113,12 @@ static void __attribute__((unused)) DM002_init()
 uint16_t DM002_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(DM002_PACKET_PERIOD);
+		#endif
 		DM002_send_packet(0);
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/DSM_cyrf6936.ino

@@ -230,7 +230,7 @@ static void __attribute__((unused)) DSM_update_channels()
 	if(sub_protocol==DSM_AUTO)
 		num_ch=12;						// Force 12 channels in mode Auto
 	else
-		num_ch=option;
+		num_ch=option & 0x7F;			// Remove the Max Throw flag
 	if(num_ch<4 || num_ch>12)
 		num_ch=6;						// Default to 6 channels if invalid choice...
 
@@ -273,8 +273,8 @@ static void __attribute__((unused)) DSM_build_data_packet(uint8_t upper)
 			/* Spektrum own remotes transmit normal values during bind and actually use this (e.g. Nano CP X) to
 			   select the transmitter mode (e.g. computer vs non-computer radio), so always send normal output */
 			#ifdef DSM_THROTTLE_KILL_CH
-				if(CH_TAER[idx]==THROTTLE && kill_ch<=604)
-				{//Activate throttle kill only if DSM_THROTTLE_KILL_CH below -50%
+				if(idx==CH1 && kill_ch<=604)
+				{//Activate throttle kill only if channel is throttle and DSM_THROTTLE_KILL_CH below -50%
 					if(kill_ch<CHANNEL_MIN_100)					// restrict val to 0...400
 						kill_ch=0;
 					else
@@ -286,7 +286,10 @@ static void __attribute__((unused)) DSM_build_data_packet(uint8_t upper)
 				#ifdef DSM_MAX_THROW
 					value=Channel_data[CH_TAER[idx]];								// -100%..+100% => 1024..1976us and -125%..+125% => 904..2096us based on Redcon 6 channel DSM2 RX
 				#else
-					value=convert_channel_16b_nolimit(CH_TAER[idx],0x150,0x6B0);	// -100%..+100% => 1100..1900us and -125%..+125% => 1000..2000us based on Redcon 6 channel DSM2 RX
+					if(option & 0x80)
+						value=Channel_data[CH_TAER[idx]];								// -100%..+100% => 1024..1976us and -125%..+125% => 904..2096us based on Redcon 6 channel DSM2 RX
+					else
+						value=convert_channel_16b_nolimit(CH_TAER[idx],0x150,0x6B0);	// -100%..+100% => 1100..1900us and -125%..+125% => 1000..2000us based on Redcon 6 channel DSM2 RX
 				#endif
 			if(bits==10) value>>=1;
 			value |= (upper && i==0 ? 0x8000 : 0) | (idx << bits);
@@ -363,12 +366,12 @@ static uint8_t __attribute__((unused)) DSM_Check_RX_packet()
 	uint16_t sum = 384 - 0x10;
 	for(uint8_t i = 1; i < 9; i++)
 	{
-		sum += pkt[i];
+		sum += packet_in[i];
 		if(i<5)
-			if(pkt[i] != (0xff ^ cyrfmfg_id[i-1]))
+			if(packet_in[i] != (0xff ^ cyrfmfg_id[i-1]))
 				result=0; 					// bad packet
 	}
-	if( pkt[9] != (sum>>8)  && pkt[10] != (uint8_t)sum )
+	if( packet_in[9] != (sum>>8)  && packet_in[10] != (uint8_t)sum )
 		result=0;
 	return result;
 }
@@ -417,12 +420,12 @@ uint16_t ReadDsm()
 			{ // data received with no errors
 				CYRF_WriteRegister(CYRF_07_RX_IRQ_STATUS, 0x80);	// need to set RXOW before data read
 				len=CYRF_ReadRegister(CYRF_09_RX_COUNT);
-				if(len>MAX_PKT-2)
-					len=MAX_PKT-2;
-				CYRF_ReadDataPacketLen(pkt+1, len);
+				if(len>TELEMETRY_BUFFER_SIZE-2)
+					len=TELEMETRY_BUFFER_SIZE-2;
+				CYRF_ReadDataPacketLen(packet_in+1, len);
 				if(len==10 && DSM_Check_RX_packet())
 				{
-					pkt[0]=0x80;
+					packet_in[0]=0x80;
 					telemetry_link=1;						// send received data on serial
 					phase++;
 					return 2000;
@@ -452,6 +455,9 @@ uint16_t ReadDsm()
 			DSM_set_sop_data_crc();
 			return 10000;
 		case DSM_CH1_WRITE_A:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(11000);			// Always request 11ms spacing even if we don't use half of it in 22ms mode
+			#endif
 		case DSM_CH1_WRITE_B:
 		case DSM_CH2_WRITE_A:
 		case DSM_CH2_WRITE_B:
@@ -502,10 +508,10 @@ uint16_t ReadDsm()
 			{ // good data (complete with no errors)
 				CYRF_WriteRegister(CYRF_07_RX_IRQ_STATUS, 0x80);	// need to set RXOW before data read
 				len=CYRF_ReadRegister(CYRF_09_RX_COUNT);
-				if(len>MAX_PKT-2)
-					len=MAX_PKT-2;
-				CYRF_ReadDataPacketLen(pkt+1, len);
-				pkt[0]=CYRF_ReadRegister(CYRF_13_RSSI)&0x1F;// store RSSI of the received telemetry signal
+				if(len>TELEMETRY_BUFFER_SIZE-2)
+					len=TELEMETRY_BUFFER_SIZE-2;
+				CYRF_ReadDataPacketLen(packet_in+1, len);
+				packet_in[0]=CYRF_ReadRegister(CYRF_13_RSSI)&0x1F;// store RSSI of the received telemetry signal
 				telemetry_link=1;
 			}
 			CYRF_WriteRegister(CYRF_29_RX_ABORT, 0x20);		// Abort RX operation

Multiprotocol/Devo_cyrf6936.ino

@@ -272,6 +272,9 @@ uint16_t devo_callback()
 	static uint8_t txState=0;
 	if (txState == 0)
 	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(2400);
+		#endif
 		txState = 1;
 		DEVO_BuildPacket();
 		CYRF_WriteDataPacket(packet);

Multiprotocol/E01X_nrf24l01.ino

@@ -287,7 +287,12 @@ uint16_t E01X_callback()
 		}
 	}
 	else
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		E01X_send_packet(0);
+	}
 	return packet_period;
 }
 

Multiprotocol/ESky150_nrf24l01.ino

@@ -151,7 +151,12 @@ uint8_t ESKY150_convert_2bit_channel(uint8_t num)
 uint16_t ESKY150_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(ESKY150_SENDING_PACKET_PERIOD);
+		#endif
 		ESKY150_send_packet();
+	}
 	else
 	{
 		NRF24L01_WritePayload(packet, ESKY150_PAYLOADSIZE);

Multiprotocol/ESky_nrf24l01.ino

@@ -135,7 +135,12 @@ static void __attribute__((unused)) ESKY_send_packet(uint8_t bind)
 uint16_t ESKY_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(ESKY_PACKET_PERIOD);
+		#endif
 		ESKY_send_packet(0);
+	}
 	else
 	{
 		ESKY_send_packet(1);

Multiprotocol/FQ777_nrf24l01.ino

@@ -188,7 +188,12 @@ uint16_t FQ777_callback()
 		}
 	}
 	else
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(FQ777_PACKET_PERIOD);
+		#endif
 		FQ777_send_packet(0);
+	}
 	return FQ777_PACKET_PERIOD;
 }
 

Multiprotocol/FY326_nrf24l01.ino

@@ -188,6 +188,9 @@ uint16_t FY326_callback()
 				return FY326_PACKET_CHKTIME;
 			break;
 		case FY326_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(FY326_PACKET_PERIOD);
+			#endif
 			FY326_send_packet(0);
 			break;
 	}

Multiprotocol/FlySky_a7105.ino

@@ -145,7 +145,7 @@ static void __attribute__((unused)) flysky_build_packet(uint8_t init)
 	for(i = 0; i < 8; i++)
 	{
 		uint16_t temp=convert_channel_ppm(CH_AETR[i]);
-		if(sub_protocol == CX20 && CH_AETR[i]==ELEVATOR)
+		if(sub_protocol == CX20 && i==CH2) //ELEVATOR
 			temp=3000-temp;
 		packet[5 + i*2]=temp&0xFF;		//low byte of servo timing(1000-2000us)
 		packet[6 + i*2]=(temp>>8)&0xFF;	//high byte of servo timing(1000-2000us)
@@ -168,16 +168,15 @@ uint16_t ReadFlySky()
 	}
 	else
 	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		flysky_build_packet(0);
 		A7105_WriteData(21, hopping_frequency[hopping_frequency_no & 0x0F]);
 		A7105_SetPower();
 	}
 	hopping_frequency_no++;
-
-	if(sub_protocol==CX20)
-		return 3984;
-	else
-		return 1510;	//1460 on deviation but not working with the latest V911 bricks... Turnigy 9X v2 is 1533, Flysky TX for 9XR/9XR Pro is 1510, V911 TX is 1490.
+	return packet_period;
 }
 
 const uint8_t PROGMEM tx_channels[8][4] = {
@@ -235,6 +234,10 @@ uint16_t initFlySky()
 	}
 	hopping_frequency_no=0;
 	packet_count=0;
+	if(sub_protocol==CX20)
+		packet_period=3984;
+	else
+		packet_period=1510;	//1460 on deviation but not working with the latest V911 bricks... Turnigy 9X v2 is 1533, Flysky TX for 9XR/9XR Pro is 1510, V911 TX is 1490.
 	if(IS_BIND_IN_PROGRESS)
 		bind_counter = FLYSKY_BIND_COUNT;
 	else

Multiprotocol/Flyzone_a7105.ino

@@ -55,6 +55,9 @@ uint16_t ReadFlyzone()
 		if(phase>19)
 		{
 			phase=0;
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(20*1500);
+			#endif
 			flyzone_build_packet();
 			A7105_WriteData(8, hopping_frequency[0]);
 			A7105_SetPower();

Multiprotocol/FrSkyDVX_common.ino

@@ -13,169 +13,27 @@
  along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifdef ENABLE_PPM
-void InitPPM()
-{
-	for(uint8_t i=0;i<NUM_CHN;i++)
-		PPM_data[i]=PPM_MAX_100+PPM_MIN_100;
-	PPM_data[THROTTLE]=PPM_MIN_100*2;
-}
-#endif
-void InitChannel()
-{
-	for(uint8_t i=0;i<NUM_CHN;i++)
-		Channel_data[i]=1024;
-	#ifdef FAILSAFE_THROTTLE_LOW_VAL
-		Channel_data[THROTTLE]=(uint16_t)FAILSAFE_THROTTLE_LOW_VAL;	//0=-125%, 204=-100%
-	#else
-		Channel_data[THROTTLE]=204;
-	#endif
-}
-/************************/
-/**  Convert routines  **/
-/************************/
-// Convert channel 8b with limit and deadband
-uint8_t convert_channel_8b_limit_deadband(uint8_t num,uint8_t min,uint8_t mid, uint8_t max, uint8_t deadband)
-{
-	uint16_t val=limit_channel_100(num);		// 204<->1844
-	uint16_t db_low=CHANNEL_MID-deadband, db_high=CHANNEL_MID+deadband; // 1024+-deadband
-	int32_t calc;
-	uint8_t out;
-	if(val>=db_low && val<=db_high)
-		return mid;
-	else if(val<db_low)
-	{
-		val-=CHANNEL_MIN_100;
-		calc=mid-min;
-		calc*=val;
-		calc/=(db_low-CHANNEL_MIN_100);
-		out=calc;
-		out+=min;
-	}
-	else
-	{
-		val-=db_high;
-		calc=max-mid;
-		calc*=val;
-		calc/=(CHANNEL_MAX_100-db_high+1);
-		out=calc;
-		out+=mid;
-		if(max>min) out++; else out--;
-	}
-	return out;
-}
-
-// Reverse a channel and store it
-void reverse_channel(uint8_t num)
-{
-	uint16_t val=2048-Channel_data[num];
-	if(val>=2048) val=2047;
-	Channel_data[num]=val;
-}
-// Channel value is converted to ppm 860<->2140 -125%<->+125% and 988<->2012 -100%<->+100%
-uint16_t convert_channel_ppm(uint8_t num)
-{
-	uint16_t val=Channel_data[num];
-	return (((val<<2)+val)>>3)+860;				//value range 860<->2140 -125%<->+125%
-}
-// Channel value 100% is converted to 10bit values 0<->1023
-uint16_t convert_channel_10b(uint8_t num)
-{
-	uint16_t val=Channel_data[num];
-	val=((val<<2)+val)>>3;
-	if(val<=128) return 0;
-	if(val>=1152) return 1023;
-	return val-128;
-}
-// Channel value 100% is converted to 8bit values 0<->255
-uint8_t convert_channel_8b(uint8_t num)
-{
-	uint16_t val=Channel_data[num];
-	val=((val<<2)+val)>>5;
-	if(val<=32) return 0;
-	if(val>=288) return 255;
-	return val-32;
-}
-
-// Channel value 100% is converted to value scaled
-int16_t convert_channel_16b_limit(uint8_t num,int16_t min,int16_t max)
-{
-	int32_t val=limit_channel_100(num);			// 204<->1844
-	val=(val-CHANNEL_MIN_100)*(max-min)/(CHANNEL_MAX_100-CHANNEL_MIN_100)+min;
-	return (uint16_t)val;
-}
-
-// Channel value -125%<->125% is scaled to 16bit value with no limit
-int16_t convert_channel_16b_nolimit(uint8_t num, int16_t min, int16_t max)
-{
-	int32_t val=Channel_data[num];				// 0<->2047
-	val=(val-CHANNEL_MIN_100)*(max-min)/(CHANNEL_MAX_100-CHANNEL_MIN_100)+min;
-	return (uint16_t)val;
-}
-
-// Channel value is converted sign + magnitude 8bit values
-uint8_t convert_channel_s8b(uint8_t num)
-{
-	uint8_t ch;
-	ch = convert_channel_8b(num);
-	return (ch < 128 ? 127-ch : ch);	
-}
-
-// Channel value is limited to 100%
-uint16_t limit_channel_100(uint8_t num)
-{
-	if(Channel_data[num]>=CHANNEL_MAX_100)
-		return CHANNEL_MAX_100;
-	if (Channel_data[num]<=CHANNEL_MIN_100)
-		return CHANNEL_MIN_100;
-	return Channel_data[num];
-}
-
-// Channel value is converted for HK310
-void convert_channel_HK310(uint8_t num, uint8_t *low, uint8_t *high)
-{
-	uint16_t temp=0xFFFF-(3440+((Channel_data[num]*5)>>1))/3;
-	*low=(uint8_t)(temp&0xFF);
-	*high=(uint8_t)(temp>>8);
-}
-#ifdef FAILSAFE_ENABLE
-// Failsafe value is converted for HK310
-void convert_failsafe_HK310(uint8_t num, uint8_t *low, uint8_t *high)
-{
-	uint16_t temp=0xFFFF-(3440+((Failsafe_data[num]*5)>>1))/3;
-	*low=(uint8_t)(temp&0xFF);
-	*high=(uint8_t)(temp>>8);
-}
-#endif
-
-// Channel value for FrSky (PPM is multiplied by 1.5)
-uint16_t convert_channel_frsky(uint8_t num)
-{
-	uint16_t val=Channel_data[num];
-	return ((val*15)>>4)+1290;
-}
-
 /******************************/
 /**  FrSky D and X routines  **/
 /******************************/
 
-#if defined(FRSKYX_CC2500_INO) || defined(FRSKYX_RX_CC2500_INO)
+#if defined(FRSKYX_CC2500_INO) || defined(FRSKY_RX_CC2500_INO)
 //**CRC**
-const uint16_t PROGMEM frskyX_CRC_Short[]={
+const uint16_t PROGMEM FrSkyX_CRC_Short[]={
 	0x0000, 0x1189, 0x2312, 0x329B, 0x4624, 0x57AD, 0x6536, 0x74BF,
 	0x8C48, 0x9DC1, 0xAF5A, 0xBED3, 0xCA6C, 0xDBE5, 0xE97E, 0xF8F7 };
-static uint16_t __attribute__((unused)) frskyX_CRCTable(uint8_t val)
+static uint16_t __attribute__((unused)) FrSkyX_CRCTable(uint8_t val)
 {
 	uint16_t word ;
-	word = pgm_read_word(&frskyX_CRC_Short[val&0x0F]) ;
+	word = pgm_read_word(&FrSkyX_CRC_Short[val&0x0F]) ;
 	val /= 16 ;
 	return word ^ (0x1081 * val) ;
 }
-uint16_t frskyX_crc_x(uint8_t *data, uint8_t len)
+uint16_t FrSkyX_crc(uint8_t *data, uint8_t len)
 {
 	uint16_t crc = 0;
 	for(uint8_t i=0; i < len; i++)
-		crc = (crc<<8) ^ frskyX_CRCTable((uint8_t)(crc>>8) ^ *data++);
+		crc = (crc<<8) ^ FrSkyX_CRCTable((uint8_t)(crc>>8) ^ *data++);
 	return crc;
 }
 #endif
@@ -189,7 +47,7 @@ enum {
 	FRSKY_DATA2,
 	FRSKY_DATA3,
 	FRSKY_DATA4,
-	FRSKY_DATA5
+	FRSKY_DATA5,
 };
 
 void Frsky_init_hop(void)

Multiprotocol/FrSkyD_cc2500.ino

@@ -97,9 +97,6 @@ uint16_t initFrSky_2way()
 {
 	Frsky_init_hop();
 	packet_count=0;
-	#if defined TELEMETRY
-		init_frskyd_link_telemetry();
-	#endif
 	if(IS_BIND_IN_PROGRESS)
 	{
 		frsky2way_init(1);
@@ -156,15 +153,18 @@ uint16_t ReadFrSky_2way()
 	{
 		if (state == FRSKY_DATA1)
 		{
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(9000);
+			#endif
 			len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;
 			if (len && len<=(0x11+3))// 20bytes
 			{		
-				CC2500_ReadData(pkt, len);				//received telemetry packets
+				CC2500_ReadData(packet_in, len);				//received telemetry packets
 				#if defined(TELEMETRY)
-					if(pkt[len-1] & 0x80)
+					if(packet_in[len-1] & 0x80)
 					{//with valid crc
 						packet_count=0;
-						frsky_check_telemetry(pkt,len);	//check if valid telemetry packets and buffer them.
+						frsky_check_telemetry(packet_in,len);	//check if valid telemetry packets and buffer them.
 					}
 				#endif
 			}
@@ -177,7 +177,7 @@ uint16_t ReadFrSky_2way()
 					packet_count=0;
 					#if defined TELEMETRY
 						telemetry_link=0;//no link frames
-						pkt[6]=0;//no user frames.
+						packet_in[6]=0;//no user frames.
 					#endif
 				}
 			}

Multiprotocol/FrSkyV_cc2500.ino

@@ -117,6 +117,9 @@ uint16_t ReadFRSKYV()
 {
 	if(IS_BIND_DONE)
 	{	// Normal operation
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(9006);
+		#endif
 		uint8_t chan = FRSKYV_calc_channel();
 		CC2500_Strobe(CC2500_SIDLE);
 		if (option != prev_option)

Multiprotocol/FrSkyX_Rx_cc2500.ino

@@ -1,373 +0,0 @@
-/*
- This project is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- Multiprotocol is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#if defined(FRSKYX_RX_CC2500_INO)
-
-#include "iface_cc2500.h" 
-
- #define FRSKYX_FCC_LENGTH	(30+2)
- #define FRSKYX_LBT_LENGTH	(33+2)
-
- enum {
-	FRSKYX_RX_TUNE_START,
-	FRSKYX_RX_TUNE_LOW,
-	FRSKYX_RX_TUNE_HIGH,
-	FRSKYX_RX_BIND,
-	FRSKYX_RX_DATA,
- };
-
- static uint8_t frskyx_rx_chanskip;
- static uint8_t frskyx_rx_disable_lna;
- static uint8_t frskyx_rx_data_started;
- static int8_t  frskyx_rx_finetune;
-
-static void __attribute__((unused)) frskyx_rx_strobe_rx()
-{
-	 CC2500_Strobe(CC2500_SIDLE);
-	 CC2500_Strobe(CC2500_SFRX);
-	 CC2500_Strobe(CC2500_SRX);
-}
-
-static void __attribute__((unused)) FrSkyX_Rx_initialise() {
-	CC2500_Reset();
-	
-	CC2500_WriteReg(CC2500_02_IOCFG0, 0x01);
-	CC2500_WriteReg(CC2500_18_MCSM0, 0x18);
-	CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x04);
-	CC2500_WriteReg(CC2500_3E_PATABLE, 0xFF);
-	CC2500_WriteReg(CC2500_0C_FSCTRL0, 0);
-	CC2500_WriteReg(CC2500_0D_FREQ2, 0x5C);
-	CC2500_WriteReg(CC2500_13_MDMCFG1, 0x23);
-	CC2500_WriteReg(CC2500_14_MDMCFG0, 0x7A);
-	CC2500_WriteReg(CC2500_19_FOCCFG, 0x16);
-	CC2500_WriteReg(CC2500_1A_BSCFG, 0x6C);
-	CC2500_WriteReg(CC2500_1B_AGCCTRL2, 0x03);
-	CC2500_WriteReg(CC2500_1C_AGCCTRL1, 0x40);
-	CC2500_WriteReg(CC2500_1D_AGCCTRL0, 0x91);
-	CC2500_WriteReg(CC2500_21_FREND1, 0x56);
-	CC2500_WriteReg(CC2500_22_FREND0, 0x10);
-	CC2500_WriteReg(CC2500_23_FSCAL3, 0xA9);
-	CC2500_WriteReg(CC2500_24_FSCAL2, 0x0A);
-	CC2500_WriteReg(CC2500_25_FSCAL1, 0x00);
-	CC2500_WriteReg(CC2500_26_FSCAL0, 0x11);
-	CC2500_WriteReg(CC2500_29_FSTEST, 0x59);
-	CC2500_WriteReg(CC2500_2C_TEST2, 0x88);
-	CC2500_WriteReg(CC2500_2D_TEST1, 0x31);
-	CC2500_WriteReg(CC2500_2E_TEST0, 0x0B);
-	CC2500_WriteReg(CC2500_03_FIFOTHR, 0x07);
-	CC2500_WriteReg(CC2500_09_ADDR, 0x00);
-
-	switch (sub_protocol) {
-	case FRSKYX_FCC:
-		CC2500_WriteReg(CC2500_17_MCSM1, 0x0C);
-		CC2500_WriteReg(CC2500_0E_FREQ1, 0x76);
-		CC2500_WriteReg(CC2500_0F_FREQ0, 0x27);
-		CC2500_WriteReg(CC2500_06_PKTLEN, 0x1E);
-		CC2500_WriteReg(CC2500_08_PKTCTRL0, 0x01);
-		CC2500_WriteReg(CC2500_0B_FSCTRL1, 0x0A);
-		CC2500_WriteReg(CC2500_10_MDMCFG4, 0x7B);
-		CC2500_WriteReg(CC2500_11_MDMCFG3, 0x61);
-		CC2500_WriteReg(CC2500_12_MDMCFG2, 0x13);
-		CC2500_WriteReg(CC2500_15_DEVIATN, 0x51);
-		break;
-	case FRSKYX_LBT:
-		CC2500_WriteReg(CC2500_17_MCSM1, 0x0E);
-		CC2500_WriteReg(CC2500_0E_FREQ1, 0x80);
-		CC2500_WriteReg(CC2500_0F_FREQ0, 0x00);
-		CC2500_WriteReg(CC2500_06_PKTLEN, 0x23);
-		CC2500_WriteReg(CC2500_08_PKTCTRL0, 0x01);
-		CC2500_WriteReg(CC2500_0B_FSCTRL1, 0x08);
-		CC2500_WriteReg(CC2500_10_MDMCFG4, 0x7B);
-		CC2500_WriteReg(CC2500_11_MDMCFG3, 0xF8);
-		CC2500_WriteReg(CC2500_12_MDMCFG2, 0x03);
-		CC2500_WriteReg(CC2500_15_DEVIATN, 0x53);
-		break;
-	}
-
-	frskyx_rx_disable_lna = IS_POWER_FLAG_on;
-	CC2500_SetTxRxMode(frskyx_rx_disable_lna ? TXRX_OFF : RX_EN); // lna disable / enable
-
-	frskyx_rx_strobe_rx();
-	CC2500_WriteReg(CC2500_0A_CHANNR, 0);  // bind channel
-	delayMicroseconds(1000); // wait for RX to activate
-}
-
-static void __attribute__((unused)) frskyx_rx_set_channel(uint8_t channel)
-{
-	CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[channel]);
-	CC2500_WriteReg(CC2500_25_FSCAL1, calData[channel]);
-	frskyx_rx_strobe_rx();
-}
-
-static void __attribute__((unused)) frskyx_rx_calibrate()
-{
-	frskyx_rx_strobe_rx();
-	for (unsigned c = 0; c < 47; c++)
-	{
-		CC2500_Strobe(CC2500_SIDLE);
-		CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[c]);
-		CC2500_Strobe(CC2500_SCAL);
-		delayMicroseconds(900);
-		calData[c] = CC2500_ReadReg(CC2500_25_FSCAL1);
-	}
-}
-
-static uint8_t __attribute__((unused)) frskyx_rx_check_crc()
-{
-	uint8_t limit = packet_length - 4;
-	uint16_t lcrc = frskyX_crc_x(&packet[3], limit - 3); // computed crc
-	uint16_t rcrc = (packet[limit] << 8) | (packet[limit + 1] & 0xff); // received crc
-	return lcrc == rcrc;
-}
-
-static void __attribute__((unused)) frskyx_rx_build_telemetry_packet()
-{
-	static uint16_t frskyx_rx_rc_chan[16];
-	uint16_t pxx_channel[8];
-	uint32_t bits = 0;
-	uint8_t bitsavailable = 0;
-	uint8_t idx = 0;
-
-	// decode PXX channels
-	pxx_channel[0] = ((packet[10] << 8) & 0xF00) | packet[9];
-	pxx_channel[1] = ((packet[11] << 4) & 0xFF0) | (packet[10] >> 4);
-	pxx_channel[2] = ((packet[13] << 8) & 0xF00) | packet[12];
-	pxx_channel[3] = ((packet[14] << 4) & 0xFF0) | (packet[13] >> 4);
-	pxx_channel[4] = ((packet[16] << 8) & 0xF00) | packet[15];
-	pxx_channel[5] = ((packet[17] << 4) & 0xFF0) | (packet[16] >> 4);
-	pxx_channel[6] = ((packet[19] << 8) & 0xF00) | packet[18];
-	pxx_channel[7] = ((packet[20] << 4) & 0xFF0) | (packet[19] >> 4);
-	for (unsigned i = 0; i < 8; i++) {
-		uint8_t shifted = (pxx_channel[i] & 0x800)>0;
-		uint16_t channel_value = pxx_channel[i] & 0x7FF;
-		if (channel_value < 64)
-			frskyx_rx_rc_chan[shifted ? i + 8 : i] = 0;
-		else
-			frskyx_rx_rc_chan[shifted ? i + 8 : i] = min(((channel_value - 64) << 4) / 15, 2047);
-	}
-
-	// buid telemetry packet
-	pkt[idx++] = RX_LQI;
-	pkt[idx++] = RX_RSSI;
-	pkt[idx++] = 0;  // start channel
-	pkt[idx++] = 16; // number of channels in packet
-
-	// pack channels
-	for (int i = 0; i < 16; i++) {
-		bits |= frskyx_rx_rc_chan[i] << bitsavailable;
-		bitsavailable += 11;
-		while (bitsavailable >= 8) {
-			pkt[idx++] = bits & 0xff;
-			bits >>= 8;
-			bitsavailable -= 8;
-		}
-	}
-}
-
-uint16_t initFrSkyX_Rx()
-{
-	FrSkyX_Rx_initialise();
-	state = 0;
-	frskyx_rx_chanskip = 1;
-	hopping_frequency_no = 0;
-	frskyx_rx_data_started = 0;
-	frskyx_rx_finetune = 0;
-	telemetry_link = 0;
-	if (IS_BIND_IN_PROGRESS) {
-		phase = FRSKYX_RX_TUNE_START;
-	}
-	else {
-		uint16_t temp = FRSKYX_RX_EEPROM_OFFSET;
-		rx_tx_addr[0] = eeprom_read_byte((EE_ADDR)temp++);
-		rx_tx_addr[1] = eeprom_read_byte((EE_ADDR)temp++);
-		rx_tx_addr[2] = eeprom_read_byte((EE_ADDR)temp++);
-		frskyx_rx_finetune = eeprom_read_byte((EE_ADDR)temp++);
-		for(uint8_t ch = 0; ch < 47; ch++)
-			hopping_frequency[ch] = eeprom_read_byte((EE_ADDR)temp++);
-		frskyx_rx_calibrate();
-		CC2500_WriteReg(CC2500_18_MCSM0, 0x08); // FS_AUTOCAL = manual
-		CC2500_WriteReg(CC2500_09_ADDR, rx_tx_addr[0]); // set address
-		CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // check address
-		if (option == 0)
-			CC2500_WriteReg(CC2500_0C_FSCTRL0, frskyx_rx_finetune);
-		else
-			CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
-		frskyx_rx_set_channel(hopping_frequency_no);
-		phase = FRSKYX_RX_DATA;
-	}
-	packet_length = (sub_protocol == FRSKYX_LBT) ? FRSKYX_LBT_LENGTH : FRSKYX_FCC_LENGTH;
-	return 1000;
-}
-
-uint16_t FrSkyX_Rx_callback()
-{
-	static uint32_t pps_timer=0;
-	static uint8_t pps_counter=0;
-	static int8_t read_retry = 0;
-	static int8_t tune_low, tune_high;
-	uint8_t len, ch;
-
-	if ((prev_option != option) && (phase >= FRSKYX_RX_DATA)) {
-		if (option == 0)
-			CC2500_WriteReg(CC2500_0C_FSCTRL0, frskyx_rx_finetune);
-		else
-			CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
-		prev_option = option;
-	}
-
-	if (frskyx_rx_disable_lna != IS_POWER_FLAG_on) {
-		frskyx_rx_disable_lna = IS_POWER_FLAG_on;
-		CC2500_SetTxRxMode(frskyx_rx_disable_lna ? TXRX_OFF : RX_EN);
-	}
-
-	len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;
-
-	switch(phase) {
-	case FRSKYX_RX_TUNE_START:
-		if (len >= packet_length) {
-			CC2500_ReadData(packet, packet_length);
-			if(packet[1] == 0x03 && packet[2] == 0x01) {
-				if(frskyx_rx_check_crc()) {
-					frskyx_rx_finetune = -127;
-					CC2500_WriteReg(CC2500_0C_FSCTRL0, frskyx_rx_finetune);
-					phase = FRSKYX_RX_TUNE_LOW;
-					frskyx_rx_strobe_rx();
-					return 1000;
-				}
-			}
-		}
-		frskyx_rx_finetune += 10;
-		CC2500_WriteReg(CC2500_0C_FSCTRL0, frskyx_rx_finetune);
-		frskyx_rx_strobe_rx();
-		return 18000;
-
-	case FRSKYX_RX_TUNE_LOW:
-		if (len >= packet_length) {
-			CC2500_ReadData(packet, packet_length);
-			if (frskyx_rx_check_crc()) {
-				tune_low = frskyx_rx_finetune;
-				frskyx_rx_finetune = 127;
-				CC2500_WriteReg(CC2500_0C_FSCTRL0, frskyx_rx_finetune);
-				phase = FRSKYX_RX_TUNE_HIGH;
-				frskyx_rx_strobe_rx();
-				return 1000;
-			}
-		}
-		frskyx_rx_finetune += 1;
-		CC2500_WriteReg(CC2500_0C_FSCTRL0, frskyx_rx_finetune);
-		frskyx_rx_strobe_rx();
-		return 18000;
-
-	case FRSKYX_RX_TUNE_HIGH:
-		if (len >= packet_length) {
-			CC2500_ReadData(packet, packet_length);
-			if (frskyx_rx_check_crc()) {
-				tune_high = frskyx_rx_finetune;
-				frskyx_rx_finetune = (tune_low + tune_high) / 2;
-				CC2500_WriteReg(CC2500_0C_FSCTRL0, (int8_t)frskyx_rx_finetune);
-				if(tune_low < tune_high)
-					phase = FRSKYX_RX_BIND;
-				else
-					phase = FRSKYX_RX_TUNE_START;
-				frskyx_rx_strobe_rx();
-				return 1000;
-			}
-		}
-		frskyx_rx_finetune -= 1;
-		CC2500_WriteReg(CC2500_0C_FSCTRL0, frskyx_rx_finetune);
-		frskyx_rx_strobe_rx();
-		return 18000;
-
-	case FRSKYX_RX_BIND:
-		if(len >= packet_length) {
-			CC2500_ReadData(packet, packet_length);
-			if (frskyx_rx_check_crc()) {
-				if (packet[5] <= 0x2D) {
-					for (ch = 0; ch < 5; ch++)
-						hopping_frequency[packet[5]+ch] = packet[6+ch];
-					state |= 1 << (packet[5] / 5);
-				}
-			}
-			if (state == 0x3ff) {
-				debugln("bind complete");
-				frskyx_rx_calibrate();
-				rx_tx_addr[0] = packet[3];	// TXID
-				rx_tx_addr[1] = packet[4];	// TXID
-				rx_tx_addr[2] = packet[12]; // RX #
-				CC2500_WriteReg(CC2500_18_MCSM0, 0x08); // FS_AUTOCAL = manual
-				CC2500_WriteReg(CC2500_09_ADDR, rx_tx_addr[0]); // set address
-				CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // check address
-				phase = FRSKYX_RX_DATA;
-				frskyx_rx_set_channel(hopping_frequency_no);
-				// store txid and channel list
-				uint16_t temp = FRSKYX_RX_EEPROM_OFFSET;
-				eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[0]);
-				eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[1]);
-				eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[2]);
-				eeprom_write_byte((EE_ADDR)temp++, frskyx_rx_finetune);
-				for (ch = 0; ch < 47; ch++)
-					eeprom_write_byte((EE_ADDR)temp++, hopping_frequency[ch]);
-				BIND_DONE;
-			}
-			frskyx_rx_strobe_rx();
-		}
-		return 1000;
-
-	case FRSKYX_RX_DATA:
-		if (len >= packet_length) {
-			CC2500_ReadData(packet, packet_length);
-			if (packet[1] == rx_tx_addr[0] && packet[2] == rx_tx_addr[1] && packet[6] == rx_tx_addr[2] && frskyx_rx_check_crc()) {
-				RX_RSSI = packet[packet_length-2];
-				if(RX_RSSI >= 128)
-					RX_RSSI -= 128;
-				else
-					RX_RSSI += 128;
-				// hop to next channel
-				frskyx_rx_chanskip = ((packet[4] & 0xC0) >> 6) | ((packet[5] & 0x3F) << 2);
-				hopping_frequency_no = (hopping_frequency_no + frskyx_rx_chanskip) % 47;
-				frskyx_rx_set_channel(hopping_frequency_no);
-				if(packet[7] == 0 && telemetry_link == 0) { // standard packet, send channels to TX
-						frskyx_rx_build_telemetry_packet();
-						telemetry_link = 1;
-				}
-				frskyx_rx_data_started = 1;
-				read_retry = 0;
-				pps_counter++;
-			}
-		}
-		
-		// packets per second
-		if (millis() - pps_timer >= 1000) {
-			pps_timer = millis();
-			debugln("%ld pps", pps_counter);
-			RX_LQI = pps_counter;
-			pps_counter = 0;
-		}
-
-		// skip channel if no packet received in time
-		if (read_retry++ >= 9) {
-			hopping_frequency_no = (hopping_frequency_no + frskyx_rx_chanskip) % 47;
-			frskyx_rx_set_channel(hopping_frequency_no);
-			if(frskyx_rx_data_started)
-				read_retry = 0;
-			else
-				read_retry = -50; // retry longer until first packet is catched
-		}
-		break;
-	}
-	return 1000;
-}
-
-#endif

Multiprotocol/FrSkyX_cc2500.ino

@@ -19,20 +19,30 @@
 
 #include "iface_cc2500.h"
 
-uint8_t FrX_chanskip;
-uint8_t FrX_send_seq ;
-uint8_t FrX_receive_seq ;
+uint8_t FrSkyX_chanskip;
+uint8_t FrSkyX_TX_Seq, FrSkyX_TX_IN_Seq;
+uint8_t FrSkyX_RX_Seq ;
 
-#define FRX_FAILSAFE_TIMEOUT 1032
+#ifdef SPORT_SEND
+	struct t_FrSkyX_TX_Frame
+	{
+		uint8_t count;
+		uint8_t payload[8];
+	} ;
+	// Store FrskyX telemetry
+	struct t_FrSkyX_TX_Frame FrSkyX_TX_Frames[4] ;
+#endif
 
-static void __attribute__((unused)) frskyX_set_start(uint8_t ch )
+#define FrSkyX_FAILSAFE_TIMEOUT 1032
+
+static void __attribute__((unused)) FrSkyX_set_start(uint8_t ch )
 {
 	CC2500_Strobe(CC2500_SIDLE);
 	CC2500_WriteReg(CC2500_25_FSCAL1, calData[ch]);
 	CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[ch]);
 }		
 
-static void __attribute__((unused)) frskyX_init()
+static void __attribute__((unused)) FrSkyX_init()
 {
 	FRSKY_init_cc2500((sub_protocol&2)?FRSKYXEU_cc2500_conf:FRSKYX_cc2500_conf); // LBT or FCC
 	//
@@ -47,7 +57,7 @@ static void __attribute__((unused)) frskyX_init()
 	//#######END INIT########		
 }
 
-static void __attribute__((unused)) frskyX_initialize_data(uint8_t adr)
+static void __attribute__((unused)) FrSkyX_initialize_data(uint8_t adr)
 {
 	CC2500_WriteReg(CC2500_0C_FSCTRL0,option);	// Frequency offset hack 
 	CC2500_WriteReg(CC2500_18_MCSM0,    0x8);	
@@ -55,7 +65,7 @@ static void __attribute__((unused)) frskyX_initialize_data(uint8_t adr)
 	CC2500_WriteReg(CC2500_07_PKTCTRL1,0x05);
 }
 
-static void __attribute__((unused)) frskyX_build_bind_packet()
+static void __attribute__((unused)) FrSkyX_build_bind_packet()
 {
 	packet[0] = (sub_protocol & 2 ) ? 0x20 : 0x1D ; // LBT or FCC
 	packet[1] = 0x03;
@@ -75,7 +85,7 @@ static void __attribute__((unused)) frskyX_build_bind_packet()
 	//
 	uint8_t limit = (sub_protocol & 2 ) ? 31 : 28 ;
 	memset(&packet[13], 0, limit - 13);
-	uint16_t lcrc = frskyX_crc_x(&packet[3], limit-3);
+	uint16_t lcrc = FrSkyX_crc(&packet[3], limit-3);
 	//
 	packet[limit++] = lcrc >> 8;
 	packet[limit] = lcrc;
@@ -84,14 +94,14 @@ static void __attribute__((unused)) frskyX_build_bind_packet()
 
 // 0-2047, 0 = 817, 1024 = 1500, 2047 = 2182
 //64=860,1024=1500,1984=2140//Taranis 125%
-static uint16_t  __attribute__((unused)) frskyX_scaleForPXX( uint8_t i )
+static uint16_t  __attribute__((unused)) FrSkyX_scaleForPXX( uint8_t i )
 {	//mapped 860,2140(125%) range to 64,1984(PXX values);
 	uint16_t chan_val=convert_channel_frsky(i)-1226;
 	if(i>7) chan_val|=2048;   // upper channels offset
 	return chan_val;
 }
 #ifdef FAILSAFE_ENABLE
-static uint16_t  __attribute__((unused)) frskyX_scaleForPXX_FS( uint8_t i )
+static uint16_t  __attribute__((unused)) FrSkyX_scaleForPXX_FS( uint8_t i )
 {	//mapped 1,2046(125%) range to 64,1984(PXX values);
 	uint16_t chan_val=((Failsafe_data[i]*15)>>4)+64;
 	if(Failsafe_data[i]==FAILSAFE_CHANNEL_NOPULSES)
@@ -103,8 +113,8 @@ static uint16_t  __attribute__((unused)) frskyX_scaleForPXX_FS( uint8_t i )
 }
 #endif
 
-#define FRX_FAILSAFE_TIME 1032
-static void __attribute__((unused)) frskyX_data_frame()
+#define FrSkyX_FAILSAFE_TIME 1032
+static void __attribute__((unused)) FrSkyX_build_packet()
 {
 	//0x1D 0xB3 0xFD 0x02 0x56 0x07 0x15 0x00 0x00 0x00 0x04 0x40 0x00 0x04 0x40 0x00 0x04 0x40 0x00 0x04 0x40 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x96 0x12
 	//
@@ -116,29 +126,30 @@ static void __attribute__((unused)) frskyX_data_frame()
 	#ifdef FAILSAFE_ENABLE
 		static uint16_t failsafe_count=0;
 		static uint8_t FS_flag=0,failsafe_chan=0;
-		if (FS_flag == 0  &&  failsafe_count > FRX_FAILSAFE_TIME  &&  chan_offset == 0  &&  IS_FAILSAFE_VALUES_on)
+		if (FS_flag == 0  &&  failsafe_count > FrSkyX_FAILSAFE_TIME  &&  chan_offset == 0  &&  IS_FAILSAFE_VALUES_on)
 		{
 			FS_flag = 0x10;
 			failsafe_chan = 0;
 		} else if (FS_flag & 0x10 && failsafe_chan < (sub_protocol & 0x01 ? 8-1:16-1))
 		{
-			FS_flag = 0x10 | ((FS_flag + 2) & 0x0F);	//10, 12, 14, 16, 18, 1A, 1C, 1E - failsafe packet
+			FS_flag = 0x10 | ((FS_flag + 2) & 0x0F);					//10, 12, 14, 16, 18, 1A, 1C, 1E - failsafe packet
 			failsafe_chan ++;
 		} else if (FS_flag & 0x10)
 		{
 			FS_flag = 0;
 			failsafe_count = 0;
+			FAILSAFE_VALUES_off;
 		}
 		failsafe_count++;
 	#endif
 	
-	packet[0] = (sub_protocol & 0x02 ) ? 0x20 : 0x1D ;	// LBT or FCC
+	packet[0] = (sub_protocol & 0x02 ) ? 0x20 : 0x1D ;					// LBT or FCC
 	packet[1] = rx_tx_addr[3];
 	packet[2] = rx_tx_addr[2];
 	packet[3] = 0x02;
 	//  
-	packet[4] = (FrX_chanskip<<6)|hopping_frequency_no; 
-	packet[5] = FrX_chanskip>>2;
+	packet[4] = (FrSkyX_chanskip<<6)|hopping_frequency_no; 
+	packet[5] = FrSkyX_chanskip>>2;
 	packet[6] = RX_num;
 	//packet[7] = FLAGS 00 - standard packet
 	//10, 12, 14, 16, 18, 1A, 1C, 1E - failsafe packet
@@ -150,78 +161,135 @@ static void __attribute__((unused)) frskyX_data_frame()
 	#endif
 	packet[8] = 0;		
 	//
-	uint8_t startChan = chan_offset;	for(uint8_t i = 0; i <12 ; i+=3)
+	uint8_t startChan = chan_offset;
+	for(uint8_t i = 0; i <12 ; i+=3)
 	{//12 bytes of channel data
 		#ifdef FAILSAFE_ENABLE
 			if( (FS_flag & 0x10) && ((failsafe_chan & 0x07) == (startChan & 0x07)) )
-				chan_0 = frskyX_scaleForPXX_FS(failsafe_chan);
+				chan_0 = FrSkyX_scaleForPXX_FS(failsafe_chan);
 			else
 		#endif
-				chan_0 = frskyX_scaleForPXX(startChan);
+				chan_0 = FrSkyX_scaleForPXX(startChan);
 		startChan++;
 		//
 		#ifdef FAILSAFE_ENABLE
 			if( (FS_flag & 0x10) && ((failsafe_chan & 0x07) == (startChan & 0x07)) )
-				chan_1 = frskyX_scaleForPXX_FS(failsafe_chan);
+				chan_1 = FrSkyX_scaleForPXX_FS(failsafe_chan);
 			else
 		#endif
-				chan_1 = frskyX_scaleForPXX(startChan);
+				chan_1 = FrSkyX_scaleForPXX(startChan);
 		startChan++;
 		//
-		packet[9+i] = lowByte(chan_0);	//3 bytes*4
+		packet[9+i] = lowByte(chan_0);									//3 bytes*4
 		packet[9+i+1]=(((chan_0>>8) & 0x0F)|(chan_1 << 4));
 		packet[9+i+2]=chan_1>>4;
 	}
-	packet[21] = (FrX_receive_seq << 4) | FrX_send_seq ;//8 at start
-	
-	if(sub_protocol & 0x01 )			// in X8 mode send only 8ch every 9ms
+	if(sub_protocol & 0x01 )											//In X8 mode send only 8ch every 9ms
 		chan_offset = 0 ;
 	else
 		chan_offset^=0x08;
 	
+	//sequence and send SPort
 	uint8_t limit = (sub_protocol & 2 ) ? 31 : 28 ;
 	for (uint8_t i=22;i<limit;i++)
 		packet[i]=0;
-	#if defined SPORT_POLLING
-		uint8_t idxs=0;
-		if(ok_to_send)
-			for (uint8_t i=23;i<limit;i++)
-			{//
-				if(sport_index==sport_idx)
-				{//no new data
-					ok_to_send=false;
-					break;
-				}
-				packet[i]=SportData[sport_index];	
-				sport_index= (sport_index+1)& (MAX_SPORT_BUFFER-1);
-				idxs++;
+	packet[21] = FrSkyX_RX_Seq << 4;									//TX=8 at startup
+	#ifdef SPORT_SEND
+		if (FrSkyX_TX_IN_Seq!=0xFF)
+		{//RX has replied at least once
+			if (FrSkyX_TX_IN_Seq & 0x08)
+			{//Request init
+				//debugln("Init");
+				FrSkyX_TX_Seq = 0 ;	
+				for(uint8_t i=0;i<4;i++)
+					FrSkyX_TX_Frames[i].count=0;						//Discard frames in current output buffer
 			}
-		packet[22]= idxs;
-		#ifdef DEBUG_SERIAL
-			for(uint8_t i=0;i<idxs;i++)
+			else if (FrSkyX_TX_IN_Seq & 0x04)
+			{//Retransmit the requested packet
+				debugln("Retry:%d",FrSkyX_TX_IN_Seq&0x03);
+				packet[21] |= FrSkyX_TX_IN_Seq&0x03;
+				packet[22]  = FrSkyX_TX_Frames[FrSkyX_TX_IN_Seq&0x03].count;
+				for (uint8_t i=23;i<23+FrSkyX_TX_Frames[FrSkyX_TX_IN_Seq&0x03].count;i++)
+					packet[i] = FrSkyX_TX_Frames[FrSkyX_TX_IN_Seq&0x03].payload[i];
+			}
+			else if ( FrSkyX_TX_Seq != 0x08 )
 			{
-				Serial.print(packet[23+i],HEX);
-				Serial.print(" ");	
-			}		
-			Serial.println(" ");
-		#endif
-	#endif // SPORT_POLLING
+				if(FrSkyX_TX_Seq==FrSkyX_TX_IN_Seq)
+				{//Send packet from the incoming radio buffer
+					//debugln("Send:%d",FrSkyX_TX_Seq);
+					packet[21] |= FrSkyX_TX_Seq;
+					uint8_t nbr_bytes=0;
+					for (uint8_t i=23;i<limit;i++)
+					{
+						if(SportHead==SportTail)
+							break; //buffer empty
+						packet[i]=SportData[SportHead];
+						FrSkyX_TX_Frames[FrSkyX_TX_Seq].payload[i-23]=SportData[SportHead];
+						SportHead=(SportHead+1) & (MAX_SPORT_BUFFER-1);
+						nbr_bytes++;
+					}
+					packet[22]=nbr_bytes;
+					FrSkyX_TX_Frames[FrSkyX_TX_Seq].count=nbr_bytes;
+					if(nbr_bytes)
+					{//Check the buffer status
+						uint8_t used = SportTail;
+						if ( SportHead > SportTail )
+							used += MAX_SPORT_BUFFER - SportHead ;
+						else
+							used -= SportHead ;
+						if ( used < (MAX_SPORT_BUFFER>>1) )
+						{
+							DATA_BUFFER_LOW_off;
+							debugln("Ok buf:%d",used);
+						}
+					}
+					FrSkyX_TX_Seq = ( FrSkyX_TX_Seq + 1 ) & 0x03 ;		//Next iteration send next packet
+				}
+				else
+				{//Not in sequence somehow, transmit what the receiver wants but why not asking for retransmit...
+					//debugln("RX_Seq:%d,TX:%d",FrSkyX_TX_IN_Seq,FrSkyX_TX_Seq);
+					packet[21] |= FrSkyX_TX_IN_Seq;
+					packet[22] = FrSkyX_TX_Frames[FrSkyX_TX_IN_Seq].count;
+					for (uint8_t i=23;i<23+FrSkyX_TX_Frames[FrSkyX_TX_IN_Seq].count;i++)
+						packet[i] = FrSkyX_TX_Frames[FrSkyX_TX_IN_Seq].payload[i-23];
+				}
+			}
+			else
+				packet[21] |= 0x08 ;									//FrSkyX_TX_Seq=8 at startup
+		}
+		if(packet[22])
+		{//Debug
+			debug("SP: ");
+			for(uint8_t i=0;i<packet[22];i++)
+				debug("%02X ",packet[23+i]);
+			debugln("");
+		}
+	#else
+		packet[21] |= FrSkyX_TX_Seq ;//TX=8 at startup
+		if ( !(FrSkyX_TX_IN_Seq & 0xF8) )
+			FrSkyX_TX_Seq = ( FrSkyX_TX_Seq + 1 ) & 0x03 ;				// Next iteration send next packet
+	#endif // SPORT_SEND
 
-	uint16_t lcrc = frskyX_crc_x(&packet[3], limit-3);
+	uint16_t lcrc = FrSkyX_crc(&packet[3], limit-3);
 	packet[limit++]=lcrc>>8;//high byte
 	packet[limit]=lcrc;//low byte
 }
 
 uint16_t ReadFrSkyX()
 {
+	static bool transmit=true;
+	#ifdef DEBUG_SERIAL
+		static uint16_t fr_time=0;
+	#endif
+	
 	switch(state)
 	{	
 		default: 
-			frskyX_set_start(47);		
+			FrSkyX_set_start(47);		
 			CC2500_SetPower();
 			CC2500_Strobe(CC2500_SFRX);
 			//		
-			frskyX_build_bind_packet();
+			FrSkyX_build_bind_packet();
 			CC2500_Strobe(CC2500_SIDLE);
 			CC2500_WriteData(packet, packet[0]+1);
 			if(IS_BIND_DONE)
@@ -230,73 +298,103 @@ uint16_t ReadFrSkyX()
 				state++;
 			return 9000;
 		case FRSKY_BIND_DONE:
-			frskyX_initialize_data(0);
+			FrSkyX_initialize_data(0);
 			hopping_frequency_no=0;
 			BIND_DONE;
-			state++;			
-			break;		
+			state++;													//FRSKY_DATA1
+			break;
+		case FRSKY_DATA5:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(9000);
+			#endif
+			#if defined TELEMETRY
+				telemetry_link=1;										//Send telemetry out anyway
+			#endif
+			len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;	
+			if (len && (len<=(0x0E + 3)))								//Telemetry frame is 17
+			{
+				packet_count=0;
+				CC2500_ReadData(packet_in, len);
+				#if defined TELEMETRY
+					frsky_check_telemetry(packet_in,len);				//Check and parse telemetry packets
+				#endif
+			}
+			else
+			{
+				packet_count++;
+				//debugln("M %d",packet_count);
+				// restart sequence on missed packet - might need count or timeout instead of one missed
+				if(packet_count>100)
+				{//~1sec
+					FrSkyX_TX_Seq = 0x08 ;								//Request init
+					FrSkyX_TX_IN_Seq = 0xFF ;							//No sequence received yet
+					#ifdef SPORT_SEND
+						for(uint8_t i=0;i<4;i++)
+							FrSkyX_TX_Frames[i].count=0;				//Discard frames in current output buffer
+					#endif
+					packet_count=0;
+					#if defined TELEMETRY
+						telemetry_lost=1;
+						telemetry_link=0;								//Stop sending telemetry
+					#endif
+				}
+				CC2500_Strobe(CC2500_SFRX);								//Flush the RXFIFO
+			}
+			FrSkyX_build_packet();
+			state = FRSKY_DATA1;
+#if not defined(FRSKYX_LBT)
+			return 500;
+#endif // for LBT just continue to DATA1 right away
 		case FRSKY_DATA1:
 			if ( prev_option != option )
 			{
-				CC2500_WriteReg(CC2500_0C_FSCTRL0,option);	// Frequency offset hack 
+				CC2500_WriteReg(CC2500_0C_FSCTRL0,option);				//Frequency offset hack 
 				prev_option = option ;
 			}
-			CC2500_SetTxRxMode(TX_EN);
-			frskyX_set_start(hopping_frequency_no);
-			CC2500_SetPower();		
-			CC2500_Strobe(CC2500_SFRX);
-			hopping_frequency_no = (hopping_frequency_no+FrX_chanskip)%47;
-			CC2500_Strobe(CC2500_SIDLE);		
-			CC2500_WriteData(packet, packet[0]+1);
-			//
-//			frskyX_data_frame();
+			FrSkyX_set_start(hopping_frequency_no);
+			transmit=true;
+#ifdef FRSKYX_LBT
+			CC2500_Strobe(CC2500_SIDLE);
+			delayMicroseconds(90);										//Wait for the freq to stabilize
+			CC2500_Strobe(CC2500_SRX);									//Acquire RSSI
 			state++;
-			return 5200;
+			return 500;
 		case FRSKY_DATA2:
+			uint8_t rssi;
+			rssi = CC2500_ReadReg(CC2500_34_RSSI | CC2500_READ_BURST);	// 0.5 db/count, RSSI value read from the RSSI status register is a 2's complement number
+			if ((sub_protocol & 2) && rssi > 72 && rssi < 128)			//LBT and RSSI between -36 and -8.5 dBm
+			{
+				transmit=false;
+				debugln("Busy %d %d",hopping_frequency_no,rssi);
+			}
+#endif
+			CC2500_Strobe(CC2500_SIDLE);
+			CC2500_Strobe(CC2500_SFRX);
+			CC2500_SetTxRxMode(TX_EN);
+			CC2500_SetPower();
+			hopping_frequency_no = (hopping_frequency_no+FrSkyX_chanskip)%47;
+			if(transmit)
+			{
+				#ifdef DEBUG_SERIAL
+					uint16_t fr_cur=millis();
+					fr_time=fr_cur-fr_time;
+					if(fr_time!=9)
+						debugln("Bad timing: %d",fr_time);
+					fr_time=fr_cur;
+				#endif
+				CC2500_WriteData(packet, packet[0]+1);
+			}
+			state=FRSKY_DATA3;
+			return 5200;
+		case FRSKY_DATA3:
 			CC2500_SetTxRxMode(RX_EN);
 			CC2500_Strobe(CC2500_SIDLE);
 			state++;
 			return 200;
-		case FRSKY_DATA3:		
+		case FRSKY_DATA4:
 			CC2500_Strobe(CC2500_SRX);
 			state++;
 			return 3100;
-		case FRSKY_DATA4:
-			len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;	
-			if (len && (len<=(0x0E + 3)))				//Telemetry frame is 17
-			{
-				packet_count=0;
-				CC2500_ReadData(pkt, len);
-				#if defined TELEMETRY
-					frsky_check_telemetry(pkt,len);	//check if valid telemetry packets
-					//parse telemetry packets here
-					//The same telemetry function used by FrSky(D8).
-				#endif
-			} 
-			else
-			{
-				packet_count++;
-				// restart sequence on missed packet - might need count or timeout instead of one missed
-				if(packet_count>100)
-				{//~1sec
-//					seq_last_sent = 0;
-//					seq_last_rcvd = 8;
-					FrX_send_seq = 0x08 ;
-//					FrX_receive_seq = 0 ;
-					packet_count=0;
-					#if defined TELEMETRY
-						telemetry_lost=1;
-					#endif
-				}
-				CC2500_Strobe(CC2500_SFRX);			//flush the RXFIFO
-			}
-			frskyX_data_frame();
-			if ( FrX_send_seq != 0x08 )
-			{
-				FrX_send_seq = ( FrX_send_seq + 1 ) & 0x03 ;
-			}
-			state = FRSKY_DATA1;
-			return 500;
 	}		
 	return 1;		
 }
@@ -306,34 +404,33 @@ uint16_t initFrSkyX()
 	set_rx_tx_addr(MProtocol_id_master);
 	Frsky_init_hop();
 	packet_count=0;
-	while(!FrX_chanskip)
-		FrX_chanskip=random(0xfefefefe)%47;
+	while(!FrSkyX_chanskip)
+		FrSkyX_chanskip=random(0xfefefefe)%47;
 
 	//for test***************
 	//rx_tx_addr[3]=0xB3;
 	//rx_tx_addr[2]=0xFD;
 	//************************
-	frskyX_init();
-#if defined  SPORT_POLLING
-#ifdef INVERT_SERIAL
-	start_timer4() ;
-#endif
-#endif
-	//
+	FrSkyX_init();
+
 	if(IS_BIND_IN_PROGRESS)
 	{	   
 		state = FRSKY_BIND;
-		frskyX_initialize_data(1);
+		FrSkyX_initialize_data(1);
 	}
 	else
 	{
 		state = FRSKY_DATA1;
-		frskyX_initialize_data(0);
+		FrSkyX_initialize_data(0);
 	}
-//	seq_last_sent = 0;
-//	seq_last_rcvd = 8;
-	FrX_send_seq = 0x08 ;
-	FrX_receive_seq = 0 ;
+	FrSkyX_TX_Seq = 0x08 ;					// Request init
+	FrSkyX_TX_IN_Seq = 0xFF ;				// No sequence received yet
+	#ifdef SPORT_SEND
+		for(uint8_t i=0;i<4;i++)
+			FrSkyX_TX_Frames[i].count=0;	// discard frames in current output buffer
+		SportHead=SportTail=0;				// empty data buffer
+	#endif
+	FrSkyX_RX_Seq = 0 ;						// Seq 0 to start with
 	return 10000;
 }	
 #endif

Multiprotocol/FrSky_Rx_cc2500.ino

@@ -0,0 +1,449 @@
+/*
+ This project is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Multiprotocol is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if defined(FRSKY_RX_CC2500_INO)
+
+#include "iface_cc2500.h" 
+
+ #define FRSKY_RX_D16FCC_LENGTH	32
+ #define FRSKY_RX_D16LBT_LENGTH	35
+ #define FRSKY_RX_D8_LENGTH		20
+ #define FRSKY_RX_FORMATS		3
+
+enum
+{
+	FRSKY_RX_D16FCC = 0,
+	FRSKY_RX_D16LBT,
+	FRSKY_RX_D8
+};
+
+enum {
+	FRSKY_RX_TUNE_START,
+	FRSKY_RX_TUNE_LOW,
+	FRSKY_RX_TUNE_HIGH,
+	FRSKY_RX_BIND,
+	FRSKY_RX_DATA,
+};
+
+const PROGMEM uint8_t frsky_rx_common_reg[][2] = {
+	{CC2500_02_IOCFG0, 0x01},
+	{CC2500_18_MCSM0, 0x18},
+	{CC2500_07_PKTCTRL1, 0x04},
+	{CC2500_3E_PATABLE, 0xFF},
+	{CC2500_0C_FSCTRL0, 0},
+	{CC2500_0D_FREQ2, 0x5C},
+	{CC2500_13_MDMCFG1, 0x23},
+	{CC2500_14_MDMCFG0, 0x7A},
+	{CC2500_19_FOCCFG, 0x16},
+	{CC2500_1A_BSCFG, 0x6C},
+	{CC2500_1B_AGCCTRL2, 0x03},
+	{CC2500_1C_AGCCTRL1, 0x40},
+	{CC2500_1D_AGCCTRL0, 0x91},
+	{CC2500_21_FREND1, 0x56},
+	{CC2500_22_FREND0, 0x10},
+	{CC2500_23_FSCAL3, 0xA9},
+	{CC2500_24_FSCAL2, 0x0A},
+	{CC2500_25_FSCAL1, 0x00},
+	{CC2500_26_FSCAL0, 0x11},
+	{CC2500_29_FSTEST, 0x59},
+	{CC2500_2C_TEST2, 0x88},
+	{CC2500_2D_TEST1, 0x31},
+	{CC2500_2E_TEST0, 0x0B},
+	{CC2500_03_FIFOTHR, 0x07},
+	{CC2500_09_ADDR, 0x00},
+};
+
+const PROGMEM uint8_t frsky_rx_d16fcc_reg[][2] = {
+	{CC2500_17_MCSM1, 0x0C},
+	{CC2500_0E_FREQ1, 0x76},
+	{CC2500_0F_FREQ0, 0x27},
+	{CC2500_06_PKTLEN, 0x1E},
+	{CC2500_08_PKTCTRL0, 0x01},
+	{CC2500_0B_FSCTRL1, 0x0A},
+	{CC2500_10_MDMCFG4, 0x7B},
+	{CC2500_11_MDMCFG3, 0x61},
+	{CC2500_12_MDMCFG2, 0x13},
+	{CC2500_15_DEVIATN, 0x51},
+};
+
+const PROGMEM uint8_t frsky_rx_d16lbt_reg[][2] = {
+	{CC2500_17_MCSM1, 0x0E},
+	{CC2500_0E_FREQ1, 0x80},
+	{CC2500_0F_FREQ0, 0x00},
+	{CC2500_06_PKTLEN, 0x23},
+	{CC2500_08_PKTCTRL0, 0x01},
+	{CC2500_0B_FSCTRL1, 0x08},
+	{CC2500_10_MDMCFG4, 0x7B},
+	{CC2500_11_MDMCFG3, 0xF8},
+	{CC2500_12_MDMCFG2, 0x03},
+	{CC2500_15_DEVIATN, 0x53},
+};
+
+const PROGMEM uint8_t frsky_rx_d8_reg[][2] = {
+	{CC2500_17_MCSM1,    0x0C},
+	{CC2500_0E_FREQ1,    0x76},
+	{CC2500_0F_FREQ0,    0x27},
+	{CC2500_06_PKTLEN,   0x19},
+	{CC2500_08_PKTCTRL0, 0x05},
+	{CC2500_0B_FSCTRL1,  0x08},
+	{CC2500_10_MDMCFG4,  0xAA},
+	{CC2500_11_MDMCFG3,  0x39},
+	{CC2500_12_MDMCFG2,  0x11},
+	{CC2500_15_DEVIATN,  0x42},
+};
+
+static uint8_t frsky_rx_chanskip;
+static int8_t  frsky_rx_finetune;
+static uint8_t frsky_rx_format;
+
+static void __attribute__((unused)) frsky_rx_strobe_rx()
+{
+	 CC2500_Strobe(CC2500_SIDLE);
+	 CC2500_Strobe(CC2500_SFRX);
+	 CC2500_Strobe(CC2500_SRX);
+}
+
+static void __attribute__((unused)) frsky_rx_initialise_cc2500() {
+	const uint8_t frsky_rx_length[] = { FRSKY_RX_D16FCC_LENGTH, FRSKY_RX_D16LBT_LENGTH, FRSKY_RX_D8_LENGTH };
+	packet_length = frsky_rx_length[frsky_rx_format];
+	CC2500_Reset();
+	CC2500_Strobe(CC2500_SIDLE);
+	for (uint8_t i = 0; i < sizeof(frsky_rx_common_reg) / 2; i++)
+		CC2500_WriteReg(pgm_read_byte_near(&frsky_rx_common_reg[i][0]), pgm_read_byte_near(&frsky_rx_common_reg[i][1]));
+
+	switch (frsky_rx_format) {
+	case FRSKY_RX_D16FCC:
+		for (uint8_t i = 0; i < sizeof(frsky_rx_d16fcc_reg) / 2; i++)
+			CC2500_WriteReg(pgm_read_byte_near(&frsky_rx_d16fcc_reg[i][0]), pgm_read_byte_near(&frsky_rx_d16fcc_reg[i][1]));
+		break;
+	case FRSKY_RX_D16LBT:
+		for (uint8_t i = 0; i < sizeof(frsky_rx_d16lbt_reg) / 2; i++)
+			CC2500_WriteReg(pgm_read_byte_near(&frsky_rx_d16lbt_reg[i][0]), pgm_read_byte_near(&frsky_rx_d16lbt_reg[i][1]));
+		break;
+	case FRSKY_RX_D8:
+		for (uint8_t i = 0; i < sizeof(frsky_rx_d8_reg) / 2; i++)
+			CC2500_WriteReg(pgm_read_byte_near(&frsky_rx_d8_reg[i][0]), pgm_read_byte_near(&frsky_rx_d8_reg[i][1]));
+		CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // always check address
+		CC2500_WriteReg(CC2500_09_ADDR, 0x03); // bind address
+		CC2500_WriteReg(CC2500_23_FSCAL3, 0x89);
+		break;
+	}
+	CC2500_WriteReg(CC2500_0A_CHANNR, 0);  // bind channel
+	rx_disable_lna = IS_POWER_FLAG_on;
+	CC2500_SetTxRxMode(rx_disable_lna ? TXRX_OFF : RX_EN); // lna disable / enable
+	frsky_rx_strobe_rx();
+	delayMicroseconds(1000); // wait for RX to activate
+}
+
+static void __attribute__((unused)) frsky_rx_set_channel(uint8_t channel)
+{
+	CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[channel]);
+	if(frsky_rx_format == FRSKY_RX_D8)
+		CC2500_WriteReg(CC2500_23_FSCAL3, 0x89);
+	CC2500_WriteReg(CC2500_25_FSCAL1, calData[channel]);
+	frsky_rx_strobe_rx();
+}
+
+static void __attribute__((unused)) frsky_rx_calibrate()
+{
+	frsky_rx_strobe_rx();
+	for (unsigned c = 0; c < 47; c++)
+	{
+		CC2500_Strobe(CC2500_SIDLE);
+		CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[c]);
+		CC2500_Strobe(CC2500_SCAL);
+		delayMicroseconds(900);
+		calData[c] = CC2500_ReadReg(CC2500_25_FSCAL1);
+	}
+}
+
+static uint8_t __attribute__((unused)) frskyx_rx_check_crc()
+{
+	// check D8 checksum
+	if (frsky_rx_format == FRSKY_RX_D8)
+		return (packet[packet_length-1] & 0x80) == 0x80; // check CRC_OK flag in status byte 2
+	// check D16 checksum
+	uint8_t limit = packet_length - 4;
+	uint16_t lcrc = FrSkyX_crc(&packet[3], limit - 3); // computed crc
+	uint16_t rcrc = (packet[limit] << 8) | (packet[limit + 1] & 0xff); // received crc
+	return lcrc == rcrc;
+}
+
+static void __attribute__((unused)) frsky_rx_build_telemetry_packet()
+{
+	uint16_t raw_channel[8];
+	uint32_t bits = 0;
+	uint8_t bitsavailable = 0;
+	uint8_t idx = 0;
+	uint8_t i;
+
+	if (frsky_rx_format == FRSKY_RX_D16FCC || frsky_rx_format == FRSKY_RX_D16LBT) {
+		// decode D16 channels
+		raw_channel[0] = ((packet[10] << 8) & 0xF00) | packet[9];
+		raw_channel[1] = ((packet[11] << 4) & 0xFF0) | (packet[10] >> 4);
+		raw_channel[2] = ((packet[13] << 8) & 0xF00) | packet[12];
+		raw_channel[3] = ((packet[14] << 4) & 0xFF0) | (packet[13] >> 4);
+		raw_channel[4] = ((packet[16] << 8) & 0xF00) | packet[15];
+		raw_channel[5] = ((packet[17] << 4) & 0xFF0) | (packet[16] >> 4);
+		raw_channel[6] = ((packet[19] << 8) & 0xF00) | packet[18];
+		raw_channel[7] = ((packet[20] << 4) & 0xFF0) | (packet[19] >> 4);	
+		for (i = 0; i < 8; i++) {
+			// ignore failsafe channels
+			if(packet[7] != 0x10+(i<<1)) {
+				uint8_t shifted = (raw_channel[i] & 0x800)>0;
+				uint16_t channel_value = raw_channel[i] & 0x7FF;
+				if (channel_value < 64)
+					rx_rc_chan[shifted ? i + 8 : i] = 0;
+				else
+					rx_rc_chan[shifted ? i + 8 : i] = min(((channel_value - 64) << 4) / 15, 2047);
+			}
+		}
+	}
+	else {
+		// decode D8 channels
+		raw_channel[0] = ((packet[10] & 0x0F) << 8 | packet[6]);
+		raw_channel[1] = ((packet[10] & 0xF0) << 4 | packet[7]);
+		raw_channel[2] = ((packet[11] & 0x0F) << 8 | packet[8]);
+		raw_channel[3] = ((packet[11] & 0xF0) << 4 | packet[9]);
+		raw_channel[4] = ((packet[16] & 0x0F) << 8 | packet[12]);
+		raw_channel[5] = ((packet[16] & 0xF0) << 4 | packet[13]);
+		raw_channel[6] = ((packet[17] & 0x0F) << 8 | packet[14]);
+		raw_channel[7] = ((packet[17] & 0xF0) << 4 | packet[15]);
+		for (i = 0; i < 8; i++) {
+			if (raw_channel[i] < 1290)
+				raw_channel[i] = 1290;
+			rx_rc_chan[i] = min(((raw_channel[i] - 1290) << 4) / 15, 2047);
+		}
+	}
+
+	// buid telemetry packet
+	packet_in[idx++] = RX_LQI;
+	packet_in[idx++] = RX_RSSI;
+	packet_in[idx++] = 0;  // start channel
+	packet_in[idx++] = frsky_rx_format == FRSKY_RX_D8 ? 8 : 16; // number of channels in packet
+
+	// pack channels
+	for (i = 0; i < packet_in[3]; i++) {
+		bits |= ((uint32_t)rx_rc_chan[i]) << bitsavailable;
+		bitsavailable += 11;
+		while (bitsavailable >= 8) {
+			packet_in[idx++] = bits & 0xff;
+			bits >>= 8;
+			bitsavailable -= 8;
+		}
+	}
+}
+
+uint16_t initFrSky_Rx()
+{
+	state = 0;
+	frsky_rx_chanskip = 1;
+	hopping_frequency_no = 0;
+	rx_data_started = false;
+	frsky_rx_finetune = 0;
+	telemetry_link = 0;
+	if (IS_BIND_IN_PROGRESS) {
+		frsky_rx_format = FRSKY_RX_D8;
+		frsky_rx_initialise_cc2500();
+		phase = FRSKY_RX_TUNE_START;
+	}
+	else {
+		uint16_t temp = FRSKY_RX_EEPROM_OFFSET;
+		frsky_rx_format = eeprom_read_byte((EE_ADDR)temp++) % FRSKY_RX_FORMATS;
+		rx_tx_addr[0] = eeprom_read_byte((EE_ADDR)temp++);
+		rx_tx_addr[1] = eeprom_read_byte((EE_ADDR)temp++);
+		rx_tx_addr[2] = eeprom_read_byte((EE_ADDR)temp++);
+		frsky_rx_finetune = eeprom_read_byte((EE_ADDR)temp++);
+		for (uint8_t ch = 0; ch < 47; ch++)
+			hopping_frequency[ch] = eeprom_read_byte((EE_ADDR)temp++);
+		frsky_rx_initialise_cc2500();
+		frsky_rx_calibrate();
+		CC2500_WriteReg(CC2500_18_MCSM0, 0x08); // FS_AUTOCAL = manual
+		CC2500_WriteReg(CC2500_09_ADDR, rx_tx_addr[0]); // set address
+		CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // check address
+		if (option == 0)
+			CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
+		else
+			CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
+		frsky_rx_set_channel(hopping_frequency_no);
+		phase = FRSKY_RX_DATA;
+	}
+	return 1000;
+}
+
+uint16_t FrSky_Rx_callback()
+{
+	static uint32_t pps_timer=0;
+	static uint8_t pps_counter=0;
+	static int8_t read_retry = 0;
+	static int8_t tune_low, tune_high;
+	uint8_t len, ch;
+
+	if ((prev_option != option) && (phase >= FRSKY_RX_DATA)) {
+		if (option == 0)
+			CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
+		else
+			CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
+		prev_option = option;
+	}
+
+	if (rx_disable_lna != IS_POWER_FLAG_on) {
+		rx_disable_lna = IS_POWER_FLAG_on;
+		CC2500_SetTxRxMode(rx_disable_lna ? TXRX_OFF : RX_EN);
+	}
+
+	len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;
+
+	switch(phase) {
+	case FRSKY_RX_TUNE_START:
+		if (len >= packet_length) {
+			CC2500_ReadData(packet, packet_length);
+			if(packet[1] == 0x03 && packet[2] == 0x01) {
+				if(frskyx_rx_check_crc()) {
+					frsky_rx_finetune = -127;
+					CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
+					phase = FRSKY_RX_TUNE_LOW;
+					frsky_rx_strobe_rx();
+					return 1000;
+				}
+			}
+		}
+		frsky_rx_format = (frsky_rx_format + 1) % FRSKY_RX_FORMATS; // switch to next format (D16FCC, D16LBT, D8)
+		frsky_rx_initialise_cc2500();
+		frsky_rx_finetune += 10;
+		CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
+		frsky_rx_strobe_rx();
+		return 18000;
+
+	case FRSKY_RX_TUNE_LOW:
+		if (len >= packet_length) {
+			CC2500_ReadData(packet, packet_length);
+			if (frskyx_rx_check_crc()) {
+				tune_low = frsky_rx_finetune;
+				frsky_rx_finetune = 127;
+				CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
+				phase = FRSKY_RX_TUNE_HIGH;
+				frsky_rx_strobe_rx();
+				return 1000;
+			}
+		}
+		frsky_rx_finetune += 1;
+		CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
+		frsky_rx_strobe_rx();
+		return 18000;
+
+	case FRSKY_RX_TUNE_HIGH:
+		if (len >= packet_length) {
+			CC2500_ReadData(packet, packet_length);
+			if (frskyx_rx_check_crc()) {
+				tune_high = frsky_rx_finetune;
+				frsky_rx_finetune = (tune_low + tune_high) / 2;
+				CC2500_WriteReg(CC2500_0C_FSCTRL0, (int8_t)frsky_rx_finetune);
+				if(tune_low < tune_high)
+					phase = FRSKY_RX_BIND;
+				else
+					phase = FRSKY_RX_TUNE_START;
+				frsky_rx_strobe_rx();
+				return 1000;
+			}
+		}
+		frsky_rx_finetune -= 1;
+		CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
+		frsky_rx_strobe_rx();
+		return 18000;
+
+	case FRSKY_RX_BIND:
+		if(len >= packet_length) {
+			CC2500_ReadData(packet, packet_length);
+			if (frskyx_rx_check_crc()) {
+				if (packet[5] <= 0x2D) {
+					for (ch = 0; ch < 5; ch++)
+						hopping_frequency[packet[5]+ch] = packet[6+ch];
+					state |= 1 << (packet[5] / 5);
+				}
+			}
+			if (state == 0x3ff) {
+				debugln("bind complete");
+				frsky_rx_calibrate();
+				rx_tx_addr[0] = packet[3];	// TXID
+				rx_tx_addr[1] = packet[4];	// TXID
+				rx_tx_addr[2] = packet[12]; // RX # (D16)
+				CC2500_WriteReg(CC2500_18_MCSM0, 0x08); // FS_AUTOCAL = manual
+				CC2500_WriteReg(CC2500_09_ADDR, rx_tx_addr[0]); // set address
+				CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // check address
+				phase = FRSKY_RX_DATA;
+				frsky_rx_set_channel(hopping_frequency_no);
+				// store format, finetune setting, txid, channel list
+				uint16_t temp = FRSKY_RX_EEPROM_OFFSET;
+				eeprom_write_byte((EE_ADDR)temp++, frsky_rx_format);
+				eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[0]);
+				eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[1]);
+				eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[2]);
+				eeprom_write_byte((EE_ADDR)temp++, frsky_rx_finetune);
+				for (ch = 0; ch < 47; ch++)
+					eeprom_write_byte((EE_ADDR)temp++, hopping_frequency[ch]);
+				BIND_DONE;
+			}
+			frsky_rx_strobe_rx();
+		}
+		return 1000;
+
+	case FRSKY_RX_DATA:
+		if (len >= packet_length) {
+			CC2500_ReadData(packet, packet_length);
+			if (packet[1] == rx_tx_addr[0] && packet[2] == rx_tx_addr[1] && frskyx_rx_check_crc() && (frsky_rx_format == FRSKY_RX_D8 || packet[6] == rx_tx_addr[2])) {
+				RX_RSSI = packet[packet_length-2];
+				if(RX_RSSI >= 128)
+					RX_RSSI -= 128;
+				else
+					RX_RSSI += 128;
+				// hop to next channel
+				if (frsky_rx_format == FRSKY_RX_D16FCC || frsky_rx_format == FRSKY_RX_D16LBT)
+					frsky_rx_chanskip = ((packet[4] & 0xC0) >> 6) | ((packet[5] & 0x3F) << 2);
+				hopping_frequency_no = (hopping_frequency_no + frsky_rx_chanskip) % 47;
+				frsky_rx_set_channel(hopping_frequency_no);
+				if (telemetry_link == 0) { // send channels to TX
+						frsky_rx_build_telemetry_packet();
+						telemetry_link = 1;
+				}
+				rx_data_started = true;
+				read_retry = 0;
+				pps_counter++;
+			}
+		}
+		
+		// packets per second
+		if (millis() - pps_timer >= 1000) {
+			pps_timer = millis();
+			debugln("%d pps", pps_counter);
+			RX_LQI = pps_counter;
+			pps_counter = 0;
+		}
+
+		// skip channel if no packet received in time
+		if (read_retry++ >= 9) {
+			hopping_frequency_no = (hopping_frequency_no + frsky_rx_chanskip) % 47;
+			frsky_rx_set_channel(hopping_frequency_no);
+			if(rx_data_started)
+				read_retry = 0;
+			else
+				read_retry = -50; // retry longer until first packet is catched
+		}
+		break;
+	}
+	return 1000;
+}
+
+#endif

Multiprotocol/GD00X_nrf24l01.ino

@@ -208,6 +208,9 @@ uint16_t GD00X_callback()
 		if(--bind_counter==0)
 			BIND_DONE;
 	GD00X_send_packet();
+	#ifdef MULTI_SYNC
+		telemetry_set_input_sync(packet_period);
+	#endif
 	return packet_period;
 }
 

Multiprotocol/GW008_nrf24l01.ino

@@ -139,6 +139,9 @@ uint16_t GW008_callback()
 			return 5000;
 			break;
 		case GW008_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(GW008_PACKET_PERIOD);
+			#endif
 			GW008_send_packet(0);
 			break;
 	}

Multiprotocol/H8_3D_nrf24l01.ino

@@ -177,7 +177,12 @@ static void __attribute__((unused)) H8_3D_init()
 uint16_t H8_3D_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		H8_3D_send_packet(0);
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/HOTT_cc2500.ino

@@ -0,0 +1,387 @@
+/*
+ This project is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Multiprotocol is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if defined(HOTT_CC2500_INO)
+
+#include "iface_cc2500.h"
+
+//#define HOTT_FORCE_ID		// Force ID of original dump
+
+#define HOTT_TX_PACKET_LEN	50
+#define HOTT_RX_PACKET_LEN	22
+#define HOTT_PACKET_PERIOD	10000
+#define HOTT_NUM_RF_CHANNELS 75
+#define HOTT_COARSE	0
+
+enum {
+    HOTT_START = 0x00,
+    HOTT_CAL   = 0x01,
+    HOTT_DATA1 = 0x02,
+    HOTT_RX1   = 0x03,
+    HOTT_RX2   = 0x04,
+};
+
+#define HOTT_FREQ0_VAL 0x6E
+
+// Some important initialization parameters, all others are either default,
+// or not important in the context of transmitter
+// FIFOTHR  00
+// SYNC1    D3
+// SYNC0    91
+// PKTLEN   32 - Packet length, 50 bytes
+// PKTCTRL1 04 - APPEND_STATUS on=RSSI+LQI, all other are receive parameters - irrelevant
+// PKTCTRL0 44 - whitening, use FIFO, use CRC, fixed packet length
+// ADDR     00
+// CHANNR   10
+// FSCTRL1  09 - IF 
+// FSCTRL0  00 - zero freq offset
+// FREQ2    5C - synthesizer frequencyfor 26MHz crystal
+// FREQ1    6C
+// FREQ0    B9
+// MDMCFG4  2D - 
+// MDMCFG3  3B - 
+// MDMCFG2  73 - disable DC blocking, MSK, no Manchester code, 32 bits sync word
+// MDMCFG1  A3 - FEC enable, 4 preamble bytes, CHANSPC_E - 03
+// MDMCFG0  AA - CHANSPC_M - AA
+// DEVIATN  47 - 
+// MCSM2    07 - 
+// MCSM1    00 - always use CCA, go to IDLE when done
+// MCSM0    08 - disable autocalibration, PO_TIMEOUT - 64, no pin radio control, no forcing XTAL to stay in SLEEP
+// FOCCFG   1D
+const PROGMEM uint8_t HOTT_init_values[] = {
+  /* 00 */ 0x2F, 0x2E, 0x2F, 0x00, 0xD3, 0x91, 0x32, 0x04,
+  /* 08 */ 0x44, 0x00, 0x00, 0x09, 0x00, 0x5C, 0x6C, HOTT_FREQ0_VAL + HOTT_COARSE,
+  /* 10 */ 0x2D, 0x3B, 0x73, 0xA3, 0xAA, 0x47, 0x07, 0x00,
+  /* 18 */ 0x08, 0x1D, 0x1C, 0xC7, 0x09, 0xF0, 0x87, 0x6B,
+  /* 20 */ 0xF0, 0xB6, 0x10, 0xEA, 0x0A, 0x00, 0x11
+};
+
+static void __attribute__((unused)) HOTT_rf_init()
+{
+	CC2500_Strobe(CC2500_SIDLE);
+
+	for (uint8_t i = 0; i < 39; ++i)
+		CC2500_WriteReg(i, pgm_read_byte_near(&HOTT_init_values[i]));
+
+	prev_option = option;
+	CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
+	
+	CC2500_SetTxRxMode(TX_EN);
+	CC2500_SetPower();
+}
+
+static void __attribute__((unused)) HOTT_tune_chan()
+{
+	CC2500_Strobe(CC2500_SIDLE);
+	CC2500_WriteReg(CC2500_0A_CHANNR, (rf_ch_num+1)*3);
+	CC2500_Strobe(CC2500_SCAL);
+}
+
+static void __attribute__((unused)) HOTT_tune_chan_fast()
+{
+	CC2500_Strobe(CC2500_SIDLE);
+	CC2500_WriteReg(CC2500_0A_CHANNR, (rf_ch_num+1)*3);
+	CC2500_WriteReg(CC2500_25_FSCAL1, calData[rf_ch_num]);
+}
+
+static void __attribute__((unused)) HOTT_tune_freq()
+{
+	if ( prev_option != option )
+	{
+		CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
+		CC2500_WriteReg(CC2500_0F_FREQ0, HOTT_FREQ0_VAL + HOTT_COARSE);
+		prev_option = option ;
+		phase = HOTT_START;	// Restart the tune process if option is changed to get good tuned values
+	}
+}
+
+const uint8_t PROGMEM HOTT_hop[][HOTT_NUM_RF_CHANNELS]=
+	{	{ 48, 37, 16, 62, 9, 50, 42, 22, 68, 0, 55, 35, 21, 74, 1, 56, 31, 20, 70, 11, 45, 32, 24, 71, 8, 54, 38, 26, 61, 13, 53, 30, 15, 65, 7, 52, 34, 28, 60, 3, 47, 39, 18, 69, 2, 49, 44, 23, 72, 5, 51, 43, 19, 64, 12, 46, 33, 17, 67, 6, 58, 36, 29, 73, 14, 57, 41, 25, 63, 4, 59, 40, 27, 66, 10 },
+		{ 50, 23, 5, 34, 67, 53, 22, 12, 39, 62, 51, 21, 10, 33, 63, 59, 16, 1, 43, 66, 49, 19, 8, 30, 71, 47, 24, 2, 35, 68, 45, 25, 14, 41, 74, 55, 18, 4, 32, 61, 54, 17, 11, 31, 72, 52, 28, 6, 38, 65, 46, 15, 9, 40, 60, 48, 26, 3, 37, 70, 58, 29, 0, 36, 64, 56, 20, 7, 42, 69, 57, 27, 13, 44, 73 },
+		{ 73, 51, 39, 18, 9, 64, 56, 34, 16, 12, 66, 58, 36, 25, 11, 61, 47, 40, 15, 8, 71, 50, 43, 20, 6, 62, 54, 42, 19, 3, 63, 46, 44, 29, 14, 72, 49, 33, 22, 5, 69, 57, 30, 21, 10, 70, 45, 35, 26, 7, 65, 59, 31, 28, 1, 67, 48, 32, 24, 0, 60, 55, 41, 17, 2, 74, 52, 38, 27, 4, 68, 53, 37, 23, 13 },
+		{ 52, 60, 40, 21, 14, 50, 72, 41, 23, 13, 59, 61, 39, 16, 6, 58, 66, 33, 17, 5, 55, 64, 43, 20, 12, 54, 74, 35, 29, 3, 46, 63, 37, 22, 10, 48, 65, 31, 27, 9, 49, 73, 38, 24, 11, 56, 70, 32, 15, 1, 51, 71, 44, 18, 8, 45, 67, 36, 25, 7, 57, 62, 34, 28, 2, 53, 69, 42, 19, 4, 47, 68, 30, 26, 0 },
+		{ 50, 16, 34, 6, 71, 51, 24, 40, 7, 68, 57, 27, 33, 14, 70, 55, 26, 30, 5, 74, 47, 28, 44, 11, 67, 49, 15, 32, 9, 61, 52, 22, 37, 13, 66, 59, 18, 42, 3, 62, 46, 29, 31, 12, 60, 48, 19, 38, 1, 72, 58, 17, 36, 4, 64, 53, 21, 39, 0, 63, 56, 20, 41, 2, 65, 45, 25, 35, 10, 69, 54, 23, 43, 8, 73 },
+		{ 55, 38, 12, 62, 23, 52, 44, 3, 66, 18, 54, 36, 10, 74, 16, 56, 42, 9, 70, 17, 58, 33, 5, 69, 20, 50, 40, 1, 63, 24, 53, 37, 13, 65, 15, 48, 34, 4, 61, 22, 57, 31, 6, 64, 26, 46, 35, 11, 72, 21, 47, 30, 7, 68, 29, 45, 32, 8, 60, 19, 49, 43, 2, 67, 27, 51, 39, 0, 71, 28, 59, 41, 14, 73, 25 },
+		{ 70, 32, 18, 10, 58, 69, 38, 22, 2, 54, 67, 36, 19, 12, 57, 62, 34, 20, 14, 52, 63, 41, 15, 3, 51, 73, 42, 28, 6, 48, 60, 43, 29, 5, 45, 64, 31, 17, 4, 56, 65, 35, 26, 13, 53, 61, 37, 23, 1, 49, 68, 40, 16, 9, 47, 71, 39, 25, 7, 50, 66, 33, 24, 8, 59, 72, 44, 27, 11, 46, 74, 30, 21, 0, 55 },
+		{ 6, 45, 71, 27, 44, 10, 46, 74, 22, 32, 0, 55, 69, 21, 33, 4, 50, 66, 18, 38, 7, 57, 62, 19, 36, 1, 48, 70, 20, 40, 8, 47, 68, 15, 43, 2, 58, 61, 26, 42, 3, 56, 72, 23, 34, 14, 54, 67, 16, 37, 5, 59, 64, 24, 30, 12, 52, 65, 25, 39, 13, 49, 73, 17, 31, 9, 53, 60, 28, 35, 11, 51, 63, 29, 41 },
+		{ 31, 65, 50, 20, 13, 37, 66, 45, 23, 5, 32, 69, 54, 19, 7, 39, 74, 52, 27, 1, 42, 64, 53, 22, 4, 43, 70, 58, 16, 3, 40, 71, 57, 17, 0, 35, 63, 56, 18, 9, 44, 72, 51, 21, 6, 33, 67, 46, 25, 11, 30, 73, 55, 15, 8, 36, 62, 48, 24, 10, 41, 60, 49, 29, 14, 34, 61, 47, 26, 2, 38, 68, 59, 28, 12 },
+		{ 67, 22, 49, 36, 13, 64, 28, 57, 37, 6, 65, 29, 46, 39, 3, 70, 26, 45, 35, 1, 62, 24, 58, 34, 10, 68, 19, 53, 33, 4, 66, 21, 52, 31, 7, 74, 18, 47, 32, 5, 61, 16, 51, 38, 8, 72, 23, 55, 30, 12, 73, 17, 59, 44, 0, 60, 15, 50, 43, 14, 63, 27, 48, 42, 11, 71, 20, 54, 41, 9, 69, 25, 56, 40, 2 },
+		{ 19, 38, 14, 66, 57, 18, 44, 7, 74, 48, 23, 30, 6, 71, 58, 26, 32, 5, 61, 46, 20, 34, 0, 68, 45, 24, 36, 1, 70, 50, 27, 33, 10, 63, 52, 16, 42, 9, 65, 51, 15, 41, 11, 64, 53, 22, 37, 3, 60, 56, 28, 35, 4, 67, 49, 17, 39, 13, 69, 54, 25, 43, 2, 73, 55, 21, 31, 8, 62, 47, 29, 40, 12, 72, 59 },
+		{ 4, 52, 64, 28, 44, 14, 46, 74, 16, 32, 11, 50, 68, 27, 36, 0, 47, 70, 26, 34, 13, 57, 61, 18, 38, 6, 56, 62, 19, 40, 5, 58, 67, 17, 31, 12, 54, 63, 22, 33, 3, 53, 72, 21, 41, 10, 48, 66, 15, 35, 7, 45, 60, 20, 37, 9, 51, 69, 25, 42, 2, 59, 71, 24, 39, 1, 55, 65, 23, 30, 8, 49, 73, 29, 43 },
+		{ 44, 66, 19, 1, 56, 35, 62, 20, 4, 54, 39, 70, 24, 5, 55, 31, 74, 26, 12, 58, 32, 60, 17, 10, 45, 37, 63, 22, 3, 50, 33, 64, 16, 7, 51, 34, 61, 21, 8, 48, 38, 68, 29, 0, 46, 36, 72, 28, 14, 49, 42, 69, 25, 6, 57, 43, 65, 18, 2, 52, 30, 71, 23, 13, 47, 41, 67, 15, 9, 53, 40, 73, 27, 11, 59 },
+		{ 12, 16, 36, 46, 69, 6, 20, 44, 58, 62, 11, 19, 34, 48, 71, 1, 18, 42, 50, 74, 3, 25, 31, 47, 65, 0, 24, 33, 45, 72, 2, 23, 35, 56, 64, 10, 22, 38, 49, 63, 7, 26, 37, 51, 70, 14, 21, 30, 53, 67, 5, 15, 40, 52, 66, 9, 17, 39, 55, 60, 13, 27, 41, 54, 73, 4, 28, 32, 57, 61, 8, 29, 43, 59, 68 },
+		{ 63, 42, 18, 2, 57, 71, 34, 22, 10, 48, 67, 36, 25, 4, 46, 60, 31, 28, 6, 47, 74, 37, 15, 0, 55, 65, 32, 24, 12, 56, 66, 40, 27, 14, 52, 62, 38, 19, 3, 50, 73, 33, 29, 11, 53, 61, 35, 16, 7, 58, 72, 41, 26, 5, 59, 69, 30, 20, 9, 51, 68, 44, 23, 1, 49, 70, 39, 17, 8, 54, 64, 43, 21, 13, 45 },
+		{ 52, 1, 71, 17, 36, 47, 7, 64, 26, 32, 53, 5, 60, 20, 42, 57, 2, 66, 18, 34, 56, 4, 63, 24, 35, 46, 13, 72, 22, 30, 48, 0, 67, 21, 39, 50, 3, 74, 16, 31, 59, 14, 61, 23, 37, 45, 6, 65, 19, 44, 51, 11, 62, 27, 41, 55, 9, 68, 15, 38, 58, 8, 70, 29, 40, 54, 10, 69, 28, 33, 49, 12, 73, 25, 43 }
+		};
+const uint16_t PROGMEM HOTT_hop_val[] = { 0xC06B, 0xC34A, 0xDB24, 0x8E09, 0x272E, 0x217F, 0x155B, 0xEDE8, 0x1D31, 0x0986, 0x56F7, 0x6454, 0xC42D, 0x01D2, 0xC253, 0x1180 };
+
+static void __attribute__((unused)) HOTT_init()
+{
+	packet[0] = pgm_read_word_near( &HOTT_hop_val[num_ch] );
+	packet[1] = pgm_read_word_near( &HOTT_hop_val[num_ch] )>>8;
+
+	for(uint8_t i=0; i<HOTT_NUM_RF_CHANNELS; i++)
+		hopping_frequency[i]=pgm_read_byte_near( &HOTT_hop[num_ch][i] );
+	
+	#ifdef HOTT_FORCE_ID
+		memcpy(rx_tx_addr,"\x7C\x94\x00\x0D\x50",5);
+	#endif
+	memset(&packet[30],0xFF,9);
+	packet[39]=0x07;		// unknown and constant
+	if(IS_BIND_IN_PROGRESS)
+	{
+		packet[28] = 0x80;	// unknown 0x80 when bind starts then when RX replies start normal, 0x89/8A/8B/8C/8D/8E during normal packets
+		packet[29] = 0x02;	// unknown 0x02 when bind starts then when RX replies cycle in sequence 0x1A/22/2A/0A/12, 0x02 during normal packets
+		memset(&packet[40],0xFA,5);
+		memcpy(&packet[45],rx_tx_addr,5);
+	}
+	else
+	{
+		packet[28] = 0x8C;	// unknown 0x80 when bind starts then when RX replies start normal, 0x89/8A/8B/8C/8D/8E during normal packets, 0x0F->config menu
+		packet[29] = 0x02;	// unknown 0x02 when bind starts then when RX replies cycle in sequence 0x1A/22/2A/0A/12, 0x02 during normal packets, 0x01->config menu, 0x0A->no more RX telemetry
+		memcpy(&packet[40],rx_tx_addr,5);
+
+		uint8_t addr=HOTT_EEPROM_OFFSET+RX_num*5;
+		for(uint8_t i=0;i<5;i++)
+			packet[45+i]=eeprom_read_byte((EE_ADDR)(addr+i));
+	}
+}
+
+static void __attribute__((unused)) HOTT_data_packet()
+{
+	packet[2] = hopping_frequency_no;
+
+	packet[3] = 0x00;	// used for failsafe but may also be used for additional channels
+	#ifdef FAILSAFE_ENABLE
+		static uint8_t failsafe_count=0;
+		if(IS_FAILSAFE_VALUES_on && IS_BIND_DONE)
+		{
+			failsafe_count++;
+			if(failsafe_count>=3)
+			{
+				FAILSAFE_VALUES_off;
+				failsafe_count=0;
+			}
+		}
+		else
+			failsafe_count=0;
+	#endif
+
+	// Channels value are PPM*2, -100%=1100µs, +100%=1900µs, order TAER
+	uint16_t val;
+	for(uint8_t i=4;i<28;i+=2)
+	{
+		val=Channel_data[(i-4)>>1];
+		val=(((val<<2)+val)>>2)+860*2;					// value range 860<->2140 *2 <-> -125%<->+125%
+		#ifdef FAILSAFE_ENABLE
+			if(failsafe_count==1)
+			{ // first failsafe packet
+				packet[3]=0x40;
+				uint16_t fs=Failsafe_data[(i-4)>>1];
+				if( fs == FAILSAFE_CHANNEL_HOLD || fs == FAILSAFE_CHANNEL_NOPULSES)
+					val|=0x8000;						// channel hold flag
+				else
+				{
+					val=(((fs<<2)+fs)>>2)+860*2;		// value range 860<->2140 *2 <-> -125%<->+125%
+					val|=0x4000;						// channel specific position flag
+				}
+			}
+			else if(failsafe_count==2)
+			{ // second failsafe packet=timing?
+				packet[3]=0x50;
+				if(i==4)
+					val=2;
+				else
+					val=0;
+			}
+		#endif
+		packet[i] = val;
+		packet[i+1] = val>>8;
+	}
+
+	#ifdef HOTT_FW_TELEMETRY
+		static uint8_t prev_SerialRX_val=0;
+		if(HoTT_SerialRX && HoTT_SerialRX_val >= 0xD7 && HoTT_SerialRX_val <= 0xDF)
+		{
+			if(prev_SerialRX_val!=HoTT_SerialRX_val)
+			{
+				prev_SerialRX_val=HoTT_SerialRX_val;
+				packet[28] = HoTT_SerialRX_val;			// send the touch being pressed only once
+			}
+			else
+				packet[28] = 0xDF;						// no touch pressed
+			packet[29] = 0x01;							// 0x01->config menu
+		}
+		else
+		{
+			packet[28] = 0x8C;							// unknown 0x80 when bind starts then when RX replies start normal, 0x89/8A/8B/8C/8D/8E during normal packets, 0x0F->config menu
+			packet[29] = 0x02;							// unknown 0x02 when bind starts then when RX replies cycle in sequence 0x1A/22/2A/0A/12, 0x02 during normal packets, 0x01->config menu, 0x0A->no more RX telemetry
+		}
+	#endif
+
+	CC2500_SetTxRxMode(TX_EN);
+	CC2500_SetPower();
+	CC2500_WriteReg(CC2500_06_PKTLEN, 0x32);
+	CC2500_WriteData(packet, HOTT_TX_PACKET_LEN);
+	#if 0
+		debug("RF:%02X P:",rf_ch_num);
+		for(uint8_t i=0;i<HOTT_TX_PACKET_LEN;i++)
+			debug(" %02X",packet[i]);
+		debugln("");
+	#endif
+	hopping_frequency_no++;
+	hopping_frequency_no %= HOTT_NUM_RF_CHANNELS;
+	rf_ch_num=hopping_frequency[hopping_frequency_no];
+}
+
+uint16_t ReadHOTT()
+{
+	#ifdef HOTT_FW_TELEMETRY
+		static uint8_t pps_counter=0;
+	#endif
+
+	switch(phase)
+	{
+		case HOTT_START:
+			rf_ch_num = 0;
+			HOTT_tune_chan();
+			phase = HOTT_CAL;
+			return 2000;
+		case HOTT_CAL:
+			calData[rf_ch_num]=CC2500_ReadReg(CC2500_25_FSCAL1);
+			if (++rf_ch_num < HOTT_NUM_RF_CHANNELS)
+				HOTT_tune_chan();
+			else
+			{
+				hopping_frequency_no = 0;
+				rf_ch_num=hopping_frequency[hopping_frequency_no];
+				counter = 0;
+				phase = HOTT_DATA1;
+			}
+			return 2000;
+
+		/* Work cycle: 10ms */
+		case HOTT_DATA1:
+			//TX
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(HOTT_PACKET_PERIOD);
+			#endif
+			HOTT_tune_freq();
+			HOTT_tune_chan_fast();
+			HOTT_data_packet();
+			phase = HOTT_RX1;
+			return 4500;
+		case HOTT_RX1:
+			//RX
+			CC2500_SetTxRxMode(RX_EN);
+			CC2500_WriteReg(CC2500_06_PKTLEN, HOTT_RX_PACKET_LEN);
+			CC2500_Strobe(CC2500_SRX);
+			phase = HOTT_RX2;
+			return 4500;
+		case HOTT_RX2:
+			//Telemetry
+			len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;	
+			if (len==HOTT_RX_PACKET_LEN+2)
+			{
+				CC2500_ReadData(packet_in, len);
+				if(memcmp(rx_tx_addr,packet_in,5)==0)
+				{ // TX ID matches
+					if(IS_BIND_IN_PROGRESS)
+					{
+						debug("B:");
+						for(uint8_t i=0;i<HOTT_RX_PACKET_LEN;i++)
+							debug(" %02X", packet_in[i]);
+						debugln("");
+						uint8_t addr=HOTT_EEPROM_OFFSET+RX_num*5;
+						for(uint8_t i=0; i<5; i++)
+							eeprom_write_byte((EE_ADDR)(addr+i),packet_in[5+i]);
+						BIND_DONE;
+						HOTT_init();
+					}
+					#ifdef HOTT_FW_TELEMETRY
+						else
+						{	//Telemetry
+							// [0..4] = TXID
+							// [5..9] = RXID
+							// [10] = 0x40 bind, 0x00 normal, 0x80 config menu
+							// [11] = telmetry pages. For sensors 0x00 to 0x04, for config mennu 0x00 to 0x12.
+							// Normal telem page 0 = 0x00, 0x33, 0x34, 0x46, 0x64, 0x33, 0x0A, 0x00, 0x00, 0x00
+							//				= 0x55, 0x32, 0x38, 0x55, 0x64, 0x32, 0xD0, 0x07, 0x00, 0x55
+							//   Page 0 [12] = [21] = ??
+							//   Page 0 [13] = RX_Voltage*10 in V
+							//   Page 0 [14] = Temperature-20 in °C
+							//   Page 0 [15] = RX_RSSI
+							//   Page 0 [16] = RX_LQI ??
+							//   Page 0 [17] = RX_STR ??
+							//   Page 0 [18,19] = [19]*256+[18]=max lost packet time in ms, max value seems 2s=0x7D0
+							//   Page 0 [20] = 0x00 ??
+							// Config menu consists of the different telem pages put all together
+							//   Page X [12] = seems like all the telem pages with the same value are going together to make the full config menu text. Seen so far 'a', 'b', 'c', 'd' 
+							//   Page X [13..21] = 9 ascii chars to be displayed, char is highlighted when ascii|0x80
+							//   Screen display is 21 characters large which means that once the first 21 chars are filled go to the begining of the next line
+							//   Menu commands are sent through TX packets:
+							//     packet[28]= 0xXF=>no key press, 0xXD=>down, 0xXB=>up, 0xX9=>enter, 0xXE=>right, 0xX7=>left with X=0 or D
+							//     packet[29]= 0xX1/0xX9 with X=0 or X counting 0,1,1,2,2,..,9,9
+							TX_RSSI = packet_in[22];
+							if(TX_RSSI >=128)
+								TX_RSSI -= 128;
+							else
+								TX_RSSI += 128;
+							// Reduce telemetry to 14 bytes
+							packet_in[0]= TX_RSSI;
+							packet_in[1]= TX_LQI;
+							debug("T=");
+							for(uint8_t i=10;i < HOTT_RX_PACKET_LEN; i++)
+							{
+								packet_in[i-8]=packet_in[i];
+								debug(" %02X",packet_in[i]);
+							}
+							debugln("");
+							telemetry_link=2;
+						}
+						pps_counter++;
+					#endif
+				}
+			}
+			#ifdef HOTT_FW_TELEMETRY
+				packet_count++;
+				if(packet_count>=100)
+				{
+					TX_LQI=pps_counter;
+					pps_counter=packet_count=0;
+				}
+			#endif
+			CC2500_Strobe(CC2500_SFRX);							//Flush the RXFIFO
+			phase=HOTT_DATA1;
+			return 1000;
+	}
+	return 0;
+}
+
+uint16_t initHOTT()
+{
+	num_ch=random(0xfefefefe)%16;
+	HOTT_init();
+	HOTT_rf_init();
+	packet_count=0;
+	#ifdef HOTT_FW_TELEMETRY
+		HoTT_SerialRX_val=0;
+		HoTT_SerialRX=false;
+	#endif
+	phase = HOTT_START;
+	return 10000;
+}
+
+#endif

Multiprotocol/Hisky_nrf24l01.ino

@@ -123,8 +123,8 @@ static void __attribute__((unused)) build_ch_data()
 	for (i = 0; i< 8; i++) {
 		j=CH_AETR[i];
 		temp=convert_channel_16b_limit(j,0,1000);            			
-		if (j == THROTTLE) // It is clear that hisky's throttle stick is made reversely, so I adjust it here on purpose
-			temp = 1000 -temp;
+		if (j == CH3) // It is clear that hisky's throttle stick is made reversely, so I adjust it here on purpose
+			temp = 1000 - temp;
 		if (j == CH7)
 			temp = temp < 400 ? 0 : 3; // Gyro mode, 0 - 6 axis, 3 - 3 axis 
 		packet[i] = (uint8_t)(temp&0xFF);
@@ -151,6 +151,9 @@ uint16_t hisky_cb()
 				phase=6;
 				break;
 			case 7:	// build packet
+				#ifdef MULTI_SYNC
+					telemetry_set_input_sync(5000);
+				#endif
 				#ifdef FAILSAFE_ENABLE
 					if(IS_FAILSAFE_VALUES_on && hopping_frequency_no==0)
 					{ //  send failsafe every 100ms
@@ -159,6 +162,7 @@ uint16_t hisky_cb()
 						convert_failsafe_HK310(CH5,    &packet[4],&packet[5]);
 						packet[7]=0xAA;
 						packet[8]=0x5A;
+						FAILSAFE_VALUES_off;
 					}
 					else
 				#endif
@@ -216,6 +220,9 @@ uint16_t hisky_cb()
 			break;
 		case 7:
 			//Build normal packet
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(9000);
+			#endif
 			build_ch_data();
 			break;
 		case 8:

Multiprotocol/Hitec_cc2500.ino

@@ -259,6 +259,9 @@ uint16_t ReadHITEC()
 		case HITEC_PREP:
 			if ( prev_option == option )
 			{	// No user frequency change
+				#ifdef MULTI_SYNC
+					telemetry_set_input_sync(HITEC_PACKET_PERIOD);
+				#endif
 				HITEC_change_chan_fast();
 				hopping_frequency_no++;
 				if(hopping_frequency_no>=rf_ch_num)
@@ -285,14 +288,14 @@ uint16_t ReadHITEC()
 			return HITEC_RX1_TIMING;
 		case HITEC_RX2:
 			uint8_t len=CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;
-			if(len && len<MAX_PKT)
+			if(len && len<TELEMETRY_BUFFER_SIZE)
 			{ // Something has been received
-				CC2500_ReadData(pkt, len);
-				if( (pkt[len-1] & 0x80) && pkt[0]==len-3 && pkt[1]==rx_tx_addr[1] && pkt[2]==rx_tx_addr[2] && pkt[3]==rx_tx_addr[3])
+				CC2500_ReadData(packet_in, len);
+				if( (packet_in[len-1] & 0x80) && packet_in[0]==len-3 && packet_in[1]==rx_tx_addr[1] && packet_in[2]==rx_tx_addr[2] && packet_in[3]==rx_tx_addr[3])
 				{ //valid crc && length ok && tx_id ok
 					debug("RX:l=%d",len);
 					for(uint8_t i=0;i<len;i++)
-						debug(",%02X",pkt[i]);
+						debug(",%02X",packet_in[i]);
 					if(IS_BIND_IN_PROGRESS)
 					{
 						if(len==13)	// Bind packets have a length of 13
@@ -300,17 +303,17 @@ uint16_t ReadHITEC()
 							debug(",bind");
 							boolean check=true;
 							for(uint8_t i=5;i<=10;i++)
-								if(pkt[i]!=i%10) check=false;
-							if((pkt[4]&0xF0)==0x70 && check)
+								if(packet_in[i]!=i%10) check=false;
+							if((packet_in[4]&0xF0)==0x70 && check)
 							{
-								bind_phase=pkt[4]+1;
+								bind_phase=packet_in[4]+1;
 								if(bind_phase==0x7B)
 									bind_counter=164;	// in dumps the RX stops to reply at 0x7B so wait a little and exit
 							}
 						}
 					}
 					else
-						if( len==15 && pkt[4]==0 && pkt[12]==0 )
+						if( len==15 && packet_in[4]==0 && packet_in[12]==0 )
 						{	// Valid telemetry packets
 							// no station:
 							//		0C,1C,A1,2B,00,00,00,00,00,00,00,8D,00,64,8E	-> 00 8D=>RX battery voltage 0x008D/28=5.03V
@@ -323,40 +326,40 @@ uint16_t ReadHITEC()
 							//		0C,1C,A1,2B,00,16,00,00,00,00,00,16,00,2C,8E
 							//		0C,1C,A1,2B,00,17,00,00,00,42,44,17,00,48,8D	-> 42=>temperature3 0x42-0x28=26°C,44=>temperature4 0x44-0x28=28°C
 							//		0C,1C,A1,2B,00,18,00,00,00,00,00,18,00,50,92
-							debug(",telem,%02x",pkt[14]&0x7F);
+							debug(",telem,%02x",packet_in[14]&0x7F);
 							#if defined(HITEC_FW_TELEMETRY) || defined(HITEC_HUB_TELEMETRY)
-								TX_RSSI = pkt[13];
+								TX_RSSI = packet_in[13];
 								if(TX_RSSI >=128)
 									TX_RSSI -= 128;
 								else
 									TX_RSSI += 128;
-								TX_LQI = pkt[14]&0x7F;
+								TX_LQI = packet_in[14]&0x7F;
 							#endif
 							#if defined(HITEC_FW_TELEMETRY)
 								if(sub_protocol==OPT_FW)
 								{
 									// 8 bytes telemetry packets => see at the end of this file how to fully decode it
-									pkt[0]=TX_RSSI;				// TX RSSI
-									pkt[1]=TX_LQI;				// TX LQI
-									uint8_t offset=pkt[5]==0?1:0;
+									packet_in[0]=TX_RSSI;				// TX RSSI
+									packet_in[1]=TX_LQI;				// TX LQI
+									uint8_t offset=packet_in[5]==0?1:0;
 									for(uint8_t i=5;i < 11; i++)
-										pkt[i-3]=pkt[i+offset];	// frame number followed by 5 bytes of data
+										packet_in[i-3]=packet_in[i+offset];	// frame number followed by 5 bytes of data
 									telemetry_link=2;			// telemetry forward available
 								}
 							#endif
 							#if defined(HITEC_HUB_TELEMETRY)
 								if(sub_protocol==OPT_HUB)
 								{
-									switch(pkt[5])		// telemetry frame number
+									switch(packet_in[5])		// telemetry frame number
 									{
 										case 0x00:
-											v_lipo1 = (pkt[10])<<5 | (pkt[11])>>3;	// calculation in float is volt=(pkt[10]<<8+pkt[11])/28
+											v_lipo1 = (packet_in[10])<<5 | (packet_in[11])>>3;	// calculation in float is volt=(packet_in[10]<<8+packet_in[11])/28
 											break;
 										case 0x11:
-											v_lipo1 = (pkt[9])<<5 | (pkt[10])>>3;	// calculation in float is volt=(pkt[9]<<8+pkt[10])/28
+											v_lipo1 = (packet_in[9])<<5 | (packet_in[10])>>3;	// calculation in float is volt=(packet_in[9]<<8+packet_in[10])/28
 											break;
 										case 0x18:
-											v_lipo2 =  (pkt[6])<<5 | (pkt[7])>>3;	// calculation in float is volt=(pkt[6]<<8+pkt[7])/10
+											v_lipo2 =  (packet_in[6])<<5 | (packet_in[7])>>3;	// calculation in float is volt=(packet_in[6]<<8+packet_in[7])/10
 											break;
 									}
 									telemetry_link=1;			// telemetry hub available
@@ -391,10 +394,6 @@ uint16_t initHITEC()
 		rx_tx_addr[3]=0x6A;
 		memcpy((void *)hopping_frequency,(void *)"\x00\x3A\x4A\x32\x0C\x58\x2A\x10\x26\x20\x08\x60\x68\x70\x78\x80\x88\x56\x5E\x66\x6E",HITEC_NUM_FREQUENCE);
 	#endif
-	#if defined(HITEC_HUB_TELEMETRY)
-		if(sub_protocol==OPT_HUB)
-			init_frskyd_link_telemetry();
-	#endif
 	phase = HITEC_START;
 	return 10000;
 }

Multiprotocol/Hontai_nrf24l01.ino

@@ -242,9 +242,14 @@ uint16_t HONTAI_callback()
 		}
 	}
 	else
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		HONTAI_send_packet(0);
+	}
 
-	return sub_protocol == FQ777_951 ? FQ777_951_PACKET_PERIOD : HONTAI_PACKET_PERIOD;
+	return packet_period;
 }
 
 uint16_t initHONTAI()
@@ -253,6 +258,7 @@ uint16_t initHONTAI()
 	bind_counter = HONTAI_BIND_COUNT;
 	HONTAI_initialize_txid();
 	HONTAI_init();
+	packet_period = sub_protocol == FQ777_951 ? FQ777_951_PACKET_PERIOD : HONTAI_PACKET_PERIOD;
 	return HONTAI_INITIAL_WAIT;
 }
 #endif

Multiprotocol/Hubsan_a7105.ino

@@ -376,6 +376,9 @@ uint16_t ReadHubsan()
 		case DATA_4:
 		case DATA_5:
 			if( txState == 0) { // send packet
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(10000);
+			#endif
 #ifdef HUBSAN_HUB_TELEMETRY
 				rfMode = A7105_TX;
 #endif
@@ -464,9 +467,6 @@ uint16_t initHubsan()
 	}
 	packet_count=0;
 	bind_phase=0;
-	#ifdef HUBSAN_HUB_TELEMETRY
-		init_frskyd_link_telemetry();
-	#endif
 	return 10000;
 }
 

Multiprotocol/J6Pro_cyrf6936.ino

@@ -201,7 +201,10 @@ uint16_t ReadJ6Pro()
             cyrf_datainit();
             phase = J6PRO_CHAN_1;
         case J6PRO_CHAN_1:
-            //Keep transmit power updated
+			#ifdef MULTI_SYNC
+                telemetry_set_input_sync(24550);
+			#endif
+			//Keep transmit power updated
             CYRF_SetPower(0x28);
             j6pro_build_data_packet();
             //return 3400;

Multiprotocol/KF606_nrf24l01.ino

@@ -86,6 +86,9 @@ static void __attribute__((unused)) KF606_init()
 
 uint16_t KF606_callback()
 {
+	#ifdef MULTI_SYNC
+		telemetry_set_input_sync(KF606_PACKET_PERIOD);
+	#endif
 	if(IS_BIND_IN_PROGRESS)
 		if(--bind_counter==0)
 		{

Multiprotocol/KN_nrf24l01.ino

@@ -279,12 +279,14 @@ uint16_t initKN()
 		packet_period = KN_WL_SENDING_PACKET_PERIOD;
 		bind_counter  = KN_WL_BIND_COUNT;
 		packet_count  = KN_WL_PACKET_SEND_COUNT;
+		seed = KN_WL_PACKET_SEND_COUNT * KN_WL_SENDING_PACKET_PERIOD;
 	}
 	else
 	{
 		packet_period = KN_FX_SENDING_PACKET_PERIOD;
 		bind_counter  = KN_FX_BIND_COUNT;
 		packet_count  = KN_FX_PACKET_SEND_COUNT;
+		seed = KN_FX_PACKET_SEND_COUNT * KN_FX_SENDING_PACKET_PERIOD;
 	}
 	kn_init();
 	phase = IS_BIND_IN_PROGRESS ? KN_PHASE_PRE_BIND : KN_PHASE_PRE_SEND;
@@ -318,6 +320,9 @@ uint16_t kn_callback()
 		case KN_PHASE_SENDING:
 			if(packet_sent >= packet_count)
 			{
+				#ifdef MULTI_SYNC
+					telemetry_set_input_sync(seed);
+				#endif
 				packet_sent = 0;
 				hopping_frequency_no++;
 				if(hopping_frequency_no >= KN_RF_CH_COUNT) hopping_frequency_no = 0;

Multiprotocol/MJXQ_nrf24l01.ino

@@ -327,7 +327,12 @@ static void __attribute__((unused)) MJXQ_initialize_txid()
 uint16_t MJXQ_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(MJXQ_PACKET_PERIOD);
+		#endif
 		MJXQ_send_packet(0);
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/MT99xx_nrf24l01.ino

@@ -222,7 +222,12 @@ static void __attribute__((unused)) MT99XX_initialize_txid()
 uint16_t MT99XX_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		MT99XX_send_packet();
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/Multi.txt

@@ -52,5 +52,7 @@
 52,ZSX,280
 53,Flyzone,FZ-410
 54,Scanner
-55,FrskyX_RX,FCC,EU_LBT
+55,Frsky_RX
+56,AFHDS2A_RX
+57,HoTT
 63,XN_DUMP,250K,1M,2M

Multiprotocol/Multi_Names.ino

@@ -0,0 +1,303 @@
+/*
+ This project is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Multiprotocol is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Multiprotocol.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if defined(MULTI_NAMES)
+
+const char STR_FLYSKY[]		="FlySky";
+const char STR_HUBSAN[]		="Hubsan";
+const char STR_FRSKYD[]		="FrSky D";
+const char STR_HISKY[]		="Hisky";
+const char STR_V2X2[]		="V2x2";
+const char STR_DSM[]		="DSM";
+const char STR_DEVO[]		="Devo";
+const char STR_YD717[]		="YD717";
+const char STR_KN[]			="KN";
+const char STR_SYMAX[]		="SymaX";
+const char STR_SLT[]		="SLT";
+const char STR_CX10[]		="CX10";
+const char STR_CG023[]		="CG023";
+const char STR_BAYANG[]		="Bayang";
+const char STR_FRSKYX[]		="FrSky X";
+const char STR_ESKY[]		="ESky";
+const char STR_MT99XX[]		="MT99XX";
+const char STR_MJXQ[]		="MJXq";
+const char STR_SHENQI[]		="Shenqi";
+const char STR_FY326[]		="FY326";
+const char STR_SFHSS[]		="SFHSS";
+const char STR_J6PRO[]		="J6 Pro";
+const char STR_FQ777[]		="FQ777";
+const char STR_ASSAN[]		="Assan";
+const char STR_FRSKYV[]		="FrSky V";
+const char STR_HONTAI[]		="Hontai";
+const char STR_AFHDS2A[]	="FSky 2A";
+const char STR_Q2X2[]		="Q2x2";
+const char STR_WK2x01[]		="Walkera";
+const char STR_Q303[]		="Q303";
+const char STR_GW008[]		="GW008";
+const char STR_DM002[]		="DM002";
+const char STR_CABELL[]		="Cabell";
+const char STR_ESKY150[]	="Esky150";
+const char STR_H8_3D[]		="H8 3D";
+const char STR_CORONA[]		="Corona";
+const char STR_CFLIE[]		="CFlie";
+const char STR_HITEC[]		="Hitec";
+const char STR_WFLY[]		="WFly";
+const char STR_BUGS[]		="Bugs";
+const char STR_BUGSMINI[]	="BugMini";
+const char STR_TRAXXAS[]	="Traxxas";
+const char STR_NCC1701[]	="NCC1701";
+const char STR_E01X[]		="E01X";
+const char STR_V911S[]		="V911S";
+const char STR_GD00X[]		="GD00X";
+const char STR_V761[]		="V761";
+const char STR_KF606[]		="KF606";
+const char STR_REDPINE[]	="Redpine";
+const char STR_POTENSIC[]	="Potensi";
+const char STR_ZSX[]		="ZSX";
+const char STR_FLYZONE[]	="FlyZone";
+const char STR_SCANNER[]	="Scanner";
+const char STR_FRSKY_RX[]	="FrSkyRX";
+const char STR_AFHDS2A_RX[]	="FS2A_RX";
+const char STR_HOTT[]		="HoTT";
+const char STR_XN297DUMP[]	="XN297DP";
+
+const char STR_SUBTYPE_FLYSKY[] =     "\x04""Std\0""V9x9""V6x6""V912""CX20";
+const char STR_SUBTYPE_HUBSAN[] =     "\x04""H107""H301""H501";
+const char STR_SUBTYPE_FRSKYX[] =     "\x07""D16\0   ""D16 8ch""LBT(EU)""LBT 8ch";
+const char STR_SUBTYPE_HISKY[] =      "\x05""Std\0 ""HK310";
+const char STR_SUBTYPE_V2X2[] =       "\x06""Std\0  ""JXD506";
+const char STR_SUBTYPE_DSM[] =        "\x06""2 22ms""2 11ms""X 22ms""X 11ms";
+const char STR_SUBTYPE_DEVO[] =       "\x04""8ch\0""10ch""12ch""6ch\0""7ch\0";
+const char STR_SUBTYPE_YD717[] =      "\x07""Std\0   ""SkyWlkr""Syma X4""XINXUN\0""NIHUI\0 ";
+const char STR_SUBTYPE_KN[] =         "\x06""WLtoys""FeiLun";
+const char STR_SUBTYPE_SYMAX[] =      "\x03""Std""X5C";
+const char STR_SUBTYPE_SLT[] =        "\x06""V1_6ch""V2_8ch""Q100\0 ""Q200\0 ""MR100\0";
+const char STR_SUBTYPE_CX10[] =       "\x07""Green\0 ""Blue\0  ""DM007\0 ""-\0     ""JC3015a""JC3015b""MK33041";
+const char STR_SUBTYPE_CG023[] =      "\x05""Std\0 ""YD829";
+const char STR_SUBTYPE_BAYANG[] =     "\x07""Std\0   ""H8S3D\0 ""X16 AH\0""IRDrone""DHD D4";
+const char STR_SUBTYPE_MT99[] =       "\x06""MT99\0 ""H7\0   ""YZ\0   ""LS\0   ""FY805";
+const char STR_SUBTYPE_MJXQ[] =       "\x07""WLH08\0 ""X600\0  ""X800\0  ""H26D\0  ""E010\0  ""H26WH\0 ""Phoenix";
+const char STR_SUBTYPE_FY326[] =      "\x05""Std\0 ""FY319";
+const char STR_SUBTYPE_HONTAI[] =     "\x07""Std\0   ""JJRC X1""X5C1\0  ""FQ_951";
+const char STR_SUBTYPE_AFHDS2A[] =    "\x08""PWM,IBUS""PPM,IBUS""PWM,SBUS""PPM,SBUS";
+const char STR_SUBTYPE_Q2X2[] =       "\x04""Q222""Q242""Q282";
+const char STR_SUBTYPE_WK2x01[] =     "\x06""WK2801""WK2401""W6_5_1""W6_6_1""W6_HeL""W6_HeI";
+const char STR_SUBTYPE_Q303[] =       "\x06""Std\0  ""CX35\0 ""CX10D\0""CX10WD";
+const char STR_SUBTYPE_CABELL[] =     "\x07""V3\0    ""V3 Telm""-\0     ""-\0     ""-\0     ""-\0     ""F-Safe\0""Unbind\0";
+const char STR_SUBTYPE_H83D[] =       "\x07""Std\0   ""H20H\0  ""H20Mini""H30Mini";
+const char STR_SUBTYPE_CORONA[] =     "\x05""V1\0  ""V2\0  ""FD V3";
+const char STR_SUBTYPE_HITEC[] =      "\x07""Optima\0""Opt Hub""Minima\0";
+const char STR_SUBTYPE_BUGS_MINI[] =  "\x06""Std\0  ""Bugs3H";
+const char STR_SUBTYPE_TRAXXAS[] =    "\x04""6519";
+const char STR_SUBTYPE_E01X[] =       "\x05""E012\0""E015\0""E016H";
+const char STR_SUBTYPE_GD00X[] =      "\x05""GD_V1""GD_V2";
+const char STR_SUBTYPE_REDPINE[] =    "\x04""Fast""Slow";
+const char STR_SUBTYPE_POTENSIC[] =   "\x03""A20";
+const char STR_SUBTYPE_ZSX[] =        "\x07""280JJRC";
+const char STR_SUBTYPE_FLYZONE[] =    "\x05""FZ410";
+const char STR_SUBTYPE_XN297DUMP[] =  "\x07""250Kbps""1Mbps\0 ""2Mbps\0 ";
+
+enum
+{
+	OPTION_NONE,
+	OPTION_OPTION,
+	OPTION_RFTUNE,
+	OPTION_VIDFREQ,
+	OPTION_FIXEDID,
+	OPTION_TELEM,
+	OPTION_SRVFREQ,
+	OPTION_MAXTHR,
+	OPTION_RFCHAN
+};
+
+#define NO_SUBTYPE		nullptr
+
+const mm_protocol_definition multi_protocols[] = {
+// Protocol number, Protocol String, Number of sub_protocols, Sub_protocol strings, Option type
+#if defined(FLYSKY_A7105_INO)
+	{PROTO_FLYSKY,     STR_FLYSKY,    5, STR_SUBTYPE_FLYSKY,    OPTION_NONE    },
+#endif
+#if defined(HUBSAN_A7105_INO)
+	{PROTO_HUBSAN,     STR_HUBSAN,    3, STR_SUBTYPE_HUBSAN,    OPTION_VIDFREQ },
+#endif
+#if defined(FRSKYD_CC2500_INO)
+	{PROTO_FRSKYD,     STR_FRSKYD,    0, NO_SUBTYPE,            OPTION_RFTUNE  },
+#endif
+#if defined(HISKY_NRF24L01_INO)
+	{PROTO_HISKY,      STR_HISKY,     2, STR_SUBTYPE_HISKY,     OPTION_NONE    },
+#endif
+#if defined(V2X2_NRF24L01_INO)
+	{PROTO_V2X2,       STR_V2X2,      2, STR_SUBTYPE_V2X2,      OPTION_NONE    },
+#endif
+#if defined(DSM_CYRF6936_INO)
+	{PROTO_DSM,        STR_DSM,       4, STR_SUBTYPE_DSM,       OPTION_MAXTHR  },
+#endif
+#if defined(DEVO_CYRF6936_INO)
+	{PROTO_DEVO,       STR_DEVO,      5, STR_SUBTYPE_DEVO,      OPTION_FIXEDID },
+#endif
+#if defined(YD717_NRF24L01_INO)
+	{PROTO_YD717,      STR_YD717,     5, STR_SUBTYPE_YD717,     OPTION_NONE    },
+#endif
+#if defined(KN_NRF24L01_INO)
+	{PROTO_KN,         STR_KN,        2, STR_SUBTYPE_KN,        OPTION_NONE    },
+#endif
+#if defined(SYMAX_NRF24L01_INO)
+	{PROTO_SYMAX,      STR_SYMAX,     2, STR_SUBTYPE_SYMAX,     OPTION_NONE    },
+#endif
+#if defined(SLT_NRF24L01_INO)
+	{PROTO_SLT,        STR_SLT,       5, STR_SUBTYPE_SLT,       OPTION_NONE    },
+#endif
+#if defined(CX10_NRF24L01_INO)
+	{PROTO_CX10,       STR_CX10,      7, STR_SUBTYPE_CX10,      OPTION_NONE    },
+#endif
+#if defined(CG023_NRF24L01_INO)
+	{PROTO_CG023,      STR_CG023,     2, STR_SUBTYPE_CG023,     OPTION_NONE    },
+#endif
+#if defined(BAYANG_NRF24L01_INO)
+	{PROTO_BAYANG,     STR_BAYANG,    5, STR_SUBTYPE_BAYANG,    OPTION_TELEM   },
+#endif
+#if defined(FRSKYX_CC2500_INO)
+	{PROTO_FRSKYX,     STR_FRSKYX,    4, STR_SUBTYPE_FRSKYX,    OPTION_RFTUNE  },
+#endif
+#if defined(ESKY_NRF24L01_INO)
+	{PROTO_ESKY,       STR_ESKY,      0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(MT99XX_NRF24L01_INO)
+	{PROTO_MT99XX,     STR_MT99XX,    5, STR_SUBTYPE_MT99,      OPTION_NONE    },
+#endif
+#if defined(MJXQ_NRF24L01_INO)
+	{PROTO_MJXQ,       STR_MJXQ,      7, STR_SUBTYPE_MJXQ,      OPTION_RFTUNE  },
+#endif
+#if defined(SHENQI_NRF24L01_INO)
+	{PROTO_SHENQI,     STR_SHENQI,    0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(FY326_NRF24L01_INO)
+	{PROTO_FY326,      STR_FY326,     2, STR_SUBTYPE_FY326,     OPTION_NONE    },
+#endif
+#if defined(SFHSS_CC2500_INO)
+	{PROTO_SFHSS,      STR_SFHSS,     0, NO_SUBTYPE,            OPTION_RFTUNE  },
+#endif
+#if defined(J6PRO_CYRF6936_INO)
+	{PROTO_J6PRO,      STR_J6PRO,     0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(FQ777_NRF24L01_INO)
+	{PROTO_FQ777,      STR_FQ777,     0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(ASSAN_NRF24L01_INO)
+	{PROTO_ASSAN,      STR_ASSAN,     0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(FRSKYV_CC2500_INO)
+	{PROTO_FRSKYV,      STR_FRSKYV,   0, NO_SUBTYPE,            OPTION_RFTUNE  },
+#endif
+#if defined(HONTAI_NRF24L01_INO)
+	{PROTO_HONTAI,     STR_HONTAI,    4, STR_SUBTYPE_HONTAI,    OPTION_NONE    },
+#endif
+#if defined(AFHDS2A_A7105_INO)
+	{PROTO_AFHDS2A,    STR_AFHDS2A,   4, STR_SUBTYPE_AFHDS2A,   OPTION_SRVFREQ },
+#endif
+#if defined(CX10_NRF24L01_INO)
+	{PROTO_Q2X2,       STR_Q2X2,      3, STR_SUBTYPE_Q2X2,      OPTION_NONE    },
+#endif
+#if defined(WK2x01_CYRF6936_INO)
+	{PROTO_WK2x01,     STR_WK2x01,    6, STR_SUBTYPE_WK2x01,    OPTION_NONE    },
+#endif
+#if defined(Q303_NRF24L01_INO)
+	{PROTO_Q303,       STR_Q303,      4, STR_SUBTYPE_Q303,      OPTION_NONE    },
+#endif
+#if defined(GW008_NRF24L01_INO)
+	{PROTO_GW008,      STR_GW008,     0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(DM002_NRF24L01_INO)
+	{PROTO_DM002,      STR_DM002,     0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(CABELL_NRF24L01_INO)
+	{PROTO_CABELL,     STR_CABELL,    8, STR_SUBTYPE_CABELL,    OPTION_OPTION  },
+#endif
+#if defined(ESKY150_NRF24L01_INO)
+	{PROTO_ESKY150,    STR_ESKY150,   0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(H8_3D_NRF24L01_INO)
+	{PROTO_H8_3D,      STR_H8_3D,     4, STR_SUBTYPE_H83D,      OPTION_NONE    },
+#endif
+#if defined(CORONA_CC2500_INO)
+	{PROTO_CORONA,     STR_CORONA,    3, STR_SUBTYPE_CORONA,    OPTION_RFTUNE  },
+#endif
+#if defined(CFLIE_NRF24L01_INO)
+	{PROTO_CFLIE,      STR_CFLIE,     0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(HITEC_CC2500_INO)
+	{PROTO_HITEC,      STR_HITEC,     3, STR_SUBTYPE_HITEC,     OPTION_RFTUNE  },
+#endif
+#if defined(WFLY_CYRF6936_INO)
+	{PROTO_WFLY,       STR_WFLY,      0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(BUGS_A7105_INO)
+	{PROTO_BUGS,       STR_BUGS,      0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(BUGSMINI_NRF24L01_INO)
+	{PROTO_BUGSMINI,   STR_BUGSMINI,  2, STR_SUBTYPE_BUGS_MINI, OPTION_NONE    },
+#endif
+#if defined(TRAXXAS_CYRF6936_INO)
+	{PROTO_TRAXXAS,    STR_TRAXXAS,   1, STR_SUBTYPE_TRAXXAS,   OPTION_NONE    },
+#endif
+#if defined(NCC1701_NRF24L01_INO)
+	{PROTO_NCC1701,    STR_NCC1701,   0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(E01X_NRF24L01_INO)
+	{PROTO_E01X,       STR_E01X,      3, STR_SUBTYPE_E01X,      OPTION_OPTION  },
+#endif
+#if defined(V911S_NRF24L01_INO)
+	{PROTO_V911S,      STR_V911S,     0, NO_SUBTYPE,            OPTION_RFTUNE  },
+#endif
+#if defined(GD00X_NRF24L01_INO)
+	{PROTO_GD00X,      STR_GD00X,     2, STR_SUBTYPE_GD00X,     OPTION_RFTUNE  },
+#endif
+#if defined(V761_NRF24L01_INO)
+	{PROTO_V761,       STR_V761,      0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(KF606_NRF24L01_INO)
+	{PROTO_KF606,      STR_KF606,     0, NO_SUBTYPE,            OPTION_RFTUNE  },
+#endif
+#if defined(REDPINE_CC2500_INO)
+	{PROTO_REDPINE,    STR_REDPINE,   2, STR_SUBTYPE_REDPINE,   OPTION_RFTUNE  },
+#endif
+#if defined(POTENSIC_NRF24L01_INO)
+	{PROTO_POTENSIC,   STR_POTENSIC,  1, STR_SUBTYPE_POTENSIC,  OPTION_NONE    },
+#endif
+#if defined(ZSX_NRF24L01_INO)
+	{PROTO_ZSX,        STR_ZSX,       1, STR_SUBTYPE_ZSX,       OPTION_NONE    },
+#endif
+#if defined(FLYZONE_A7105_INO)
+	{PROTO_FLYZONE,    STR_FLYZONE,   1, STR_SUBTYPE_FLYZONE,   OPTION_NONE    },
+#endif
+#if defined(SCANNER_CC2500_INO)
+	{PROTO_SCANNER,    STR_SCANNER,   0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(FRSKY_RX_CC2500_INO)
+	{PROTO_FRSKY_RX,   STR_FRSKY_RX,  0, NO_SUBTYPE,            OPTION_RFTUNE  },
+#endif
+#if defined(AFHDS2A_RX_A7105_INO)
+	{PROTO_AFHDS2A_RX, STR_AFHDS2A_RX,0, NO_SUBTYPE,            OPTION_NONE    },
+#endif
+#if defined(HOTT_CC2500_INO)
+	{PROTO_HOTT,       STR_HOTT,      0, NO_SUBTYPE,            OPTION_RFTUNE  },
+#endif
+#if defined(XN297DUMP_NRF24L01_INO)
+	{PROTO_XN297DUMP,  STR_XN297DUMP, 3, STR_SUBTYPE_XN297DUMP, OPTION_RFCHAN  },
+#endif
+	{0x00,             nullptr,       0, nullptr,               0 }
+};
+
+#endif

Multiprotocol/Multiprotocol.h

@@ -17,9 +17,9 @@
 // Version
 //******************
 #define VERSION_MAJOR		1
-#define VERSION_MINOR		2
-#define VERSION_REVISION	1
-#define VERSION_PATCH_LEVEL	84
+#define VERSION_MINOR		3
+#define VERSION_REVISION	0
+#define VERSION_PATCH_LEVEL	44
 
 //******************
 // Protocols
@@ -81,7 +81,9 @@ enum PROTOCOLS
 	PROTO_ZSX		= 52,	// =>NRF24L01
 	PROTO_FLYZONE	= 53,	// =>A7105
 	PROTO_SCANNER	= 54,	// =>CC2500
-	PROTO_FRSKYX_RX	= 55,	// =>CC2500
+	PROTO_FRSKY_RX	= 55,	// =>CC2500
+	PROTO_AFHDS2A_RX= 56,	// =>A7105
+	PROTO_HOTT		= 57,	// =>CC2500
 	PROTO_XN297DUMP	= 63,	// =>NRF24L01
 };
 
@@ -289,11 +291,6 @@ enum TRAXXAS
 {
 	RX6519	= 0,
 };
-enum FRSKYX_RX
-{
-	FRSKYX_FCC	= 0,
-	FRSKYX_LBT
-};
 
 #define NONE 		0
 #define P_HIGH		1
@@ -303,17 +300,16 @@ enum FRSKYX_RX
 
 struct PPM_Parameters
 {
-	uint8_t protocol : 6;
-	uint8_t sub_proto : 3;
-	uint8_t rx_num : 4;
-	uint8_t power : 1;
-	uint8_t autobind : 1;
-	uint8_t option;
+	uint8_t protocol;
+	uint8_t sub_proto	: 3;
+	uint8_t rx_num		: 6;
+	uint8_t power		: 1;
+	uint8_t autobind	: 1;
+	int8_t option;
 	uint32_t chan_order;
 };
 
 // Telemetry
-
 enum MultiPacketTypes
 {
 	MULTI_TELEMETRY_STATUS			= 1,
@@ -322,13 +318,14 @@ enum MultiPacketTypes
 	MULTI_TELEMETRY_DSM				= 4,
 	MULTI_TELEMETRY_DSMBIND			= 5,
 	MULTI_TELEMETRY_AFHDS2A			= 6,
-	MULTI_TELEMETRY_CONFIG			= 7,
+	MULTI_TELEMETRY_REUSE_1			= 7,
 	MULTI_TELEMETRY_SYNC			= 8,
-	MULTI_TELEMETRY_SPORT_POLLING	= 9,
+	MULTI_TELEMETRY_REUSE_2			= 9,
 	MULTI_TELEMETRY_HITEC			= 10,
 	MULTI_TELEMETRY_SCANNER			= 11,
 	MULTI_TELEMETRY_AFHDS2A_AC		= 12,
 	MULTI_TELEMETRY_RX_CHANNELS		= 13,
+	MULTI_TELEMETRY_HOTT			= 14,
 };
 
 // Macros
@@ -389,6 +386,7 @@ enum MultiPacketTypes
 #define TX_RX_PAUSE_on		protocol_flags2 |= _BV(4)
 #define IS_TX_RX_PAUSE_on	( ( protocol_flags2 & _BV(4) ) !=0 )
 #define IS_TX_PAUSE_on		( ( protocol_flags2 & (_BV(4)|_BV(3)) ) !=0 )
+#define IS_TX_PAUSE_off		( ( protocol_flags2 & (_BV(4)|_BV(3)) ) ==0 )
 //Signal OK
 #define INPUT_SIGNAL_off	protocol_flags2 &= ~_BV(5)
 #define INPUT_SIGNAL_on		protocol_flags2 |= _BV(5)
@@ -404,6 +402,24 @@ enum MultiPacketTypes
 #define WAIT_BIND_on		protocol_flags2 |= _BV(7)
 #define IS_WAIT_BIND_on		( ( protocol_flags2 & _BV(7) ) !=0 )
 #define IS_WAIT_BIND_off	( ( protocol_flags2 & _BV(7) ) ==0 )
+//Incoming telemetry data buffer
+#define DATA_BUFFER_LOW_off		protocol_flags3 &= ~_BV(0)
+#define DATA_BUFFER_LOW_on		protocol_flags3 |= _BV(0)
+#define IS_DATA_BUFFER_LOW_on	( ( protocol_flags3 & _BV(0) ) !=0 )
+#define IS_DATA_BUFFER_LOW_off	( ( protocol_flags3 & _BV(0) ) ==0 )
+#define SEND_MULTI_STATUS_off		protocol_flags3 &= ~_BV(1)
+#define SEND_MULTI_STATUS_on		protocol_flags3 |= _BV(1)
+#define IS_SEND_MULTI_STATUS_on		( ( protocol_flags3 & _BV(1) ) !=0 )
+#define IS_SEND_MULTI_STATUS_off	( ( protocol_flags3 & _BV(1) ) ==0 )
+#define DISABLE_CH_MAP_off		protocol_flags3 &= ~_BV(2)
+#define DISABLE_CH_MAP_on		protocol_flags3 |= _BV(2)
+#define IS_DISABLE_CH_MAP_on	( ( protocol_flags3 & _BV(2) ) !=0 )
+#define IS_DISABLE_CH_MAP_off	( ( protocol_flags3 & _BV(2) ) ==0 )
+#define DISABLE_TELEM_off		protocol_flags3 &= ~_BV(3)
+#define DISABLE_TELEM_on		protocol_flags3 |= _BV(3)
+#define IS_DISABLE_TELEM_on		( ( protocol_flags3 & _BV(3) ) !=0 )
+#define IS_DISABLE_TELEM_off	( ( protocol_flags3 & _BV(3) ) ==0 )
+
 
 // Failsafe
 #define FAILSAFE_CHANNEL_HOLD		2047
@@ -575,81 +591,86 @@ enum {
 #define AFHDS2A_EEPROM_OFFSET	50		// RX ID, 4 bytes per model id, end is 50+64=114
 #define BUGS_EEPROM_OFFSET		114		// RX ID, 2 bytes per model id, end is 114+32=146
 #define BUGSMINI_EEPROM_OFFSET	146		// RX ID, 2 bytes per model id, end is 146+32=178
-#define FRSKYX_RX_EEPROM_OFFSET	178		// (3) TX ID + (1) freq_tune + (47) channels, 51 bytes per model, end is 178+51=229
-//#define CONFIG_EEPROM_OFFSET 	210		// Current configuration of the multimodule
+#define FRSKY_RX_EEPROM_OFFSET	178		// (1) format + (3) TX ID + (1) freq_tune + (47) channels, 52 bytes, end is 178+52=230
+#define AFHDS2A_RX_EEPROM_OFFSET 230	// (4) TX ID + (16) channels, 20 bytes, end is 230+20=250
+#define AFHDS2A_EEPROM_OFFSET2	250		// RX ID, 4 bytes per model id, end is 250+192=442
+#define HOTT_EEPROM_OFFSET		442		// RX ID, 5 bytes per model id, end is 320+442=762
+//#define CONFIG_EEPROM_OFFSET 	762		// Current configuration of the multimodule
 
 //****************************************
 //*** MULTI protocol serial definition ***
 //****************************************
 /*
-**************************
+***************************
 16 channels serial protocol
-**************************
+***************************
 Serial: 100000 Baud 8e2      _ xxxx xxxx p --
-  Total of 26 bytes
-  Stream[0]   = 0x55	sub_protocol values are 0..31	Stream contains channels
-  Stream[0]   = 0x54	sub_protocol values are 32..63	Stream contains channels
-  Stream[0]   = 0x57	sub_protocol values are 0..31	Stream contains failsafe
-  Stream[0]   = 0x56	sub_protocol values are 32..63	Stream contains failsafe
-   header
+  Total of 26 bytes for protocol V1, variable length 27..36 for protocol V2
+  Stream[0]   = header
+				0x55	sub_protocol values are 0..31	Stream contains channels
+				0x54	sub_protocol values are 32..63	Stream contains channels
+				0x57	sub_protocol values are 0..31	Stream contains failsafe
+				0x56	sub_protocol values are 32..63	Stream contains failsafe
   Stream[1]   = sub_protocol|BindBit|RangeCheckBit|AutoBindBit;
-   sub_protocol is 0..31 (bits 0..4), value should be added with 32 if Stream[0] = 0x54
-   =>	Reserved	0
-					Flysky		1
-					Hubsan		2
-					FrskyD		3
-					Hisky		4
-					V2x2		5
-					DSM			6
-					Devo		7
-					YD717		8
-					KN			9
-					SymaX		10
-					SLT			11
-					CX10		12
-					CG023		13
-					Bayang		14
-					FrskyX		15
-					ESky		16
-					MT99XX		17
-					MJXQ		18
-					SHENQI		19
-					FY326		20
-					SFHSS		21
-					J6PRO		22
-					FQ777		23
-					ASSAN		24
-					FrskyV		25
-					HONTAI		26
-					OpenLRS		27
-					AFHDS2A		28
-					Q2X2		29
-					WK2x01		30
-					Q303		31
-					GW008		32
-					DM002		33
-					CABELL		34
-					ESKY150		35
-					H8_3D		36
-					CORONA		37
-					CFlie		38
-					Hitec		39
-					WFLY		40
-					BUGS		41
-					BUGSMINI	42
-					TRAXXAS		43
-					NCC1701		44
-					E01X		45
-					V911S		46
-					GD00X		47
-					V761		48
-					KF606		49
-					REDPINE		50
-					POTENSIC	51
-					ZSX			52
-					FLYZONE		53
-					SCANNER		54
-					FRSKYX_RX	55
+   sub_protocol is 0..31 (bits 0..4), value should be added with 32 if Stream[0] = 0x54 | 0x56
+				Reserved	0
+				Flysky		1
+				Hubsan		2
+				FrskyD		3
+				Hisky		4
+				V2x2		5
+				DSM			6
+				Devo		7
+				YD717		8
+				KN			9
+				SymaX		10
+				SLT			11
+				CX10		12
+				CG023		13
+				Bayang		14
+				FrskyX		15
+				ESky		16
+				MT99XX		17
+				MJXQ		18
+				SHENQI		19
+				FY326		20
+				SFHSS		21
+				J6PRO		22
+				FQ777		23
+				ASSAN		24
+				FrskyV		25
+				HONTAI		26
+				OpenLRS		27
+				AFHDS2A		28
+				Q2X2		29
+				WK2x01		30
+				Q303		31
+				GW008		32
+				DM002		33
+				CABELL		34
+				ESKY150		35
+				H8_3D		36
+				CORONA		37
+				CFlie		38
+				Hitec		39
+				WFLY		40
+				BUGS		41
+				BUGSMINI	42
+				TRAXXAS		43
+				NCC1701		44
+				E01X		45
+				V911S		46
+				GD00X		47
+				V761		48
+				KF606		49
+				REDPINE		50
+				POTENSIC	51
+				ZSX			52
+				FLYZONE		53
+				SCANNER		54
+				FRSKY_RX	55
+				AFHDS2A_RX	56
+				HOTT		57
    BindBit=>		0x80	1=Bind/0=No
    AutoBindBit=>	0x40	1=Yes /0=No
    RangeCheck=>		0x20	1=Yes /0=No
@@ -791,9 +812,6 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
 			RED_SLOW	1
 		sub_protocol==TRAXXAS
 			RX6519		0
-		sub_protocol==FRSKYX_RX
-			FCC			0
-			LBT			1
 
    Power value => 0x80	0=High/1=Low
   Stream[3]   = option_protocol;
@@ -808,6 +826,14 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
    Values are concatenated to fit in 22 bytes like in SBUS protocol.
    Failsafe values have exactly the same range/values than normal channels except the extremes where
       0=no pulse, 2047=hold. If failsafe is not set or RX then failsafe packets should not be sent.
+  Stream[26]   = sub_protocol bits 6 & 7|RxNum bits 4 & 5|Telemetry_Invert 3|Future_Use 2|Disable_Telemetry 1|Disable_CH_Mapping 0
+   sub_protocol is 0..255 (bits 0..5 + bits 6..7)
+   RxNum value is 0..63 (bits 0..3 + bits 4..5)
+   Telemetry_Invert		=> 0x08	0=normal, 1=invert
+   Future_Use			=> 0x04	0=      , 1=
+   Disable_Telemetry	=> 0x02	0=enable, 1=disable
+   Disable_CH_Mapping	=> 0x01	0=enable, 1=disable
+  Stream[27.. 35] = between 0 and 9 bytes for additional protocol data
 */
 /*
   Multimodule Status
@@ -827,7 +853,9 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
    0x04 = Protocol is valid
    0x08 = Module is in binding mode
    0x10 = Module waits a bind event to load the protocol
-   0x20 = Failsafe supported by currently running protocol
+   0x20 = Current protocol supports failsafe
+   0x40 = Current protocol supports disable channel mapping
+   0x80 = Data buffer is almost full
    [3] major
    [4] minor
    [5] revision
@@ -861,19 +889,36 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
    [4] Flags
    0x01 = Input signal detected
    0x02 = Serial mode enabled
-   0x04 = protocol is valid
-   0x08 = module is in binding mode
-   0x10 = module waits a bind event to load the protocol
-   0x20 = current protocol supports failsafe
+   0x04 = Protocol is valid
+   0x08 = Module is in binding mode
+   0x10 = Module waits a bind event to load the protocol
+   0x20 = Current protocol supports failsafe
+   0x40 = Current protocol supports disable channel mapping
+   0x80 = Data buffer is almost full
    [5] major
    [6] minor
    [7] revision
-   [8] patchlevel,
-   version of multi code, should be displayed as major.minor.revision.patchlevel
+   [8] patchlevel
+     version of multi code, should be displayed as major.minor.revision.patchlevel
+   [9] channel order: CH4|CH3|CH2|CH1 with CHx value A=0,E=1,T=2,R=3
+   [10] Next valid protocol number, can be used to skip invalid protocols
+   [11] Prev valid protocol number, can be used to skip invalid protocols
+   [12..18] Protocol name [7], not null terminated if prototcol len == 7
+   [19>>4] Option text to be displayed: 
+			OPTION_NONE		0
+			OPTION_OPTION	1
+			OPTION_RFTUNE	2
+			OPTION_VIDFREQ	3
+			OPTION_FIXEDID	4
+			OPTION_TELEM	5
+			OPTION_SRVFREQ	6
+			OPTION_MAXTHR	7
+			OPTION_RFCHAN	8
+   [19&0x0F] Number of sub protocols
+   [20..27] Sub protocol name [8], not null terminated if sub prototcol len == 8
 
    more information can be added by specifing a longer length of the type, the TX will just ignore these bytes
 
-
   Type 0x02 Frksy S.port telemetry
   Type 0x03 Frsky Hub telemetry
 
@@ -894,6 +939,19 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
    data[0] = RSSI value
    data[1-28] telemetry data
 
+  Type 0x08 Input synchronisation
+    Informs the TX about desired rate and current delay
+    length: 4
+    data[0-1]     Desired refresh rate in ??s
+    data[2-3]     Time (??s) between last serial servo input received and servo input needed (lateness), TX should adjust its
+                  sending time to minimise this value.
+	data[4]		  Interval of this message in ms
+	data[5]		  Input delay target in 10??s
+   Note that there are protocols (AFHDS2A) that have a refresh rate that is smaller than the maximum achievable
+   refresh rate via the serial protocol, in this case, the TX should double the rate and also subract this
+   refresh rate from the input lag if the input lag is more than the desired refresh rate.
+   The remote should try to get to zero of  (inputdelay+target*10).
+
   Type 0x0A Hitec telemetry data
    length: 8
    data[0] = TX RSSI value
@@ -920,4 +978,12 @@ Serial: 100000 Baud 8e2      _ xxxx xxxx p --
    data[3] = number of channels to follow
    data[4-]= packed channels data, 11 bit per channel
 
+  Type 0x0E HoTT telemetry
+   length: 14
+   data[0] = TX_RSSI
+   data[1] = TX_LQI
+   data[2] = type
+   data[3] = page
+   data[4-13] = data
+
 */

Multiprotocol/NCC1701_nrf24l01.ino

@@ -197,6 +197,9 @@ uint16_t NCC_callback()
 			phase = NCC_BIND_TX2;
 			return NCC_PACKET_INTERVAL - NCC_WRITE_WAIT;
 		case NCC_TX3:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(NCC_PACKET_INTERVAL);
+			#endif
 			if( NRF24L01_ReadReg(NRF24L01_07_STATUS) & _BV(NRF24L01_07_RX_DR))
 			{ // RX fifo data ready
 				NRF24L01_ReadPayload(packet, NCC_RX_PACKET_LEN);
@@ -268,9 +271,6 @@ uint16_t initNCC(void)
 	hopping_frequency_no=4;		// start with bind
 	NCC_init();
 	phase=NCC_BIND_TX1;
-	#ifdef NCC1701_HUB_TELEMETRY
-		init_frskyd_link_telemetry();
-	#endif
 	return 10000;
 }
 

Multiprotocol/POTENSIC_nrf24l01.ino

@@ -109,6 +109,9 @@ uint16_t POTENSIC_callback()
 			BIND_DONE;
 			XN297_SetTXAddr(rx_tx_addr,5);
 		}
+	#ifdef MULTI_SYNC
+		telemetry_set_input_sync(POTENSIC_PACKET_PERIOD);
+	#endif
 	POTENSIC_send_packet();
 	return POTENSIC_PACKET_PERIOD;
 }

Multiprotocol/Q303_nrf24l01.ino

@@ -354,7 +354,12 @@ static void __attribute__((unused)) Q303_initialize_txid()
 uint16_t Q303_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		Q303_send_packet(0);
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/Redpine_cc2500.ino

@@ -125,6 +125,9 @@ static uint16_t ReadREDPINE()
 	}
 	else
 	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(packet_period);
+		#endif
 		CC2500_SetTxRxMode(TX_EN);
 		REDPINE_set_channel(hopping_frequency_no);
 		CC2500_SetPower();
@@ -133,10 +136,7 @@ static uint16_t ReadREDPINE()
 		CC2500_Strobe(CC2500_SIDLE);
 		hopping_frequency_no = (hopping_frequency_no + 1) % 49;
 		CC2500_WriteData(packet, REDPINE_PACKET_SIZE);
-		if (sub_protocol==0)
-			return REDPINE_LOOPTIME_FAST*100;
-		else
-			return REDPINE_LOOPTIME_SLOW*1000;
+		return packet_period;
 	}
 	return 1;
 }
@@ -235,6 +235,11 @@ static uint16_t initREDPINE()
 	}
 	hopping_frequency[49] = 0;  // Last channel is the bind channel at hop 0
 
+	if (sub_protocol==0)
+		packet_period = REDPINE_LOOPTIME_FAST*100;
+	else
+		packet_period = REDPINE_LOOPTIME_SLOW*1000;
+
 	bind_counter=REDPINE_BIND;
 	REDPINE_init(sub_protocol);
 	CC2500_SetTxRxMode(TX_EN);  // enable PA

Multiprotocol/SFHSS_cc2500.ino

@@ -173,8 +173,8 @@ static void __attribute__((unused)) SFHSS_build_data_packet()
 				else
 				{ //Use channel value
 					ch[i]=(ch[i]>>1)+2560;
-					if(CH_AETR[ch_offset+i]==THROTTLE && ch[i]<3072)		// Throttle
-						ch[i]+=1024;
+					//if(IS_DISABLE_CH_MAP_off && ch_offset+i==CH3 && ch[i]<3072)		// Throttle
+					//	ch[i]+=1024;
 				}
 			}
 		}
@@ -235,6 +235,9 @@ uint16_t ReadSFHSS()
 #define SFHSS_PACKET_PERIOD	6800
 #define SFHSS_DATA2_TIMING	1625	// Adjust this value between 1600 and 1650 if your RX(s) are not operating properly
 		case SFHSS_DATA1:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(6800);
+			#endif
 			SFHSS_build_data_packet();
 			SFHSS_send_packet();
 			phase = SFHSS_DATA2;

Multiprotocol/SHENQI_nrf24l01.ino

@@ -63,6 +63,10 @@ void SHENQI_send_packet()
 	}
 	else
 	{
+		#ifdef MULTI_SYNC
+			if(packet_count==1)
+				telemetry_set_input_sync(3000+2508+6*1750);
+		#endif
 		LT8900_SetAddress(rx_tx_addr,4);
 		packet[1]=255-convert_channel_8b(RUDDER);
 		packet[2]=255-convert_channel_16b_limit(THROTTLE,0x60,0xA0);
@@ -91,7 +95,9 @@ void SHENQI_send_packet()
 uint16_t SHENQI_callback()
 {
 	if(IS_BIND_DONE)
+	{
 		SHENQI_send_packet();
+	}
 	else
 	{
 		if( NRF24L01_ReadReg(NRF24L01_07_STATUS) & _BV(NRF24L01_07_RX_DR))

Multiprotocol/SLT_nrf24l01.ino

@@ -141,7 +141,7 @@ static void __attribute__((unused)) SLT_build_packet()
 	for (uint8_t i = 0; i < 4; ++i)
 	{
 		uint16_t v = convert_channel_10b(CH_AETR[i]);
-		if(sub_protocol>SLT_V2 && (CH_AETR[i]==THROTTLE || CH_AETR[i]==ELEVATOR) )
+		if(sub_protocol>SLT_V2 && (i==CH2 || i==CH3) )
 			v=1023-v;	// reverse throttle and elevator channels for Q100/Q200/MR100 protocols
 		packet[i] = v;
 		e = (e >> 2) | (uint8_t) ((v >> 2) & 0xC0);
@@ -213,6 +213,9 @@ uint16_t SLT_callback()
 	switch (phase)
 	{
 		case SLT_BUILD:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(sub_protocol==SLT_V1?20000:13730);
+			#endif
 			SLT_build_packet();
 			phase++;
 			return SLT_TIMING_BUILD;

Multiprotocol/Scanner_cc2500.ino

@@ -18,13 +18,11 @@
 #include "iface_cc2500.h"
 
 #define SCAN_MAX_RADIOCHANNEL	249 // 2483 MHz
-#define SCAN_CHANNEL_LOCK_TIME	210 // with precalibration, channel requires only 90 usec for synthesizer to settle
+#define SCAN_CHANNEL_LOCK_TIME	90 // with precalibration, channel requires only 90 usec for synthesizer to settle
 #define SCAN_AVERAGE_INTVL		20
-#define SCAN_MAX_COUNT			5
+#define SCAN_MAX_COUNT			10
 #define SCAN_CHANS_PER_PACKET	5
 
-static uint8_t scan_tlm_index;
-
 enum ScanStates {
 	SCAN_CHANNEL_CHANGE = 0,
 	SCAN_GET_RSSI = 1,
@@ -90,56 +88,53 @@ static int __attribute__((unused)) Scanner_scan_rssi()
 		rssi_rel = rssi - 128;  // relative power levels 0-127 (equals -137 to -72 dBm)
 	}
 	else {
-		rssi_rel = rssi + 128;  // relativ power levels 128-255 (equals -73 to -10 dBm)
+		rssi_rel = rssi + 128;  // relative power levels 128-255 (equals -73 to -10 dBm)
 	}
 	return rssi_rel;
 }
 
 uint16_t Scanner_callback()
 {
-	static uint8_t max_count, max_rssi;
-	uint8_t rssi;
-	switch (phase)
-	{
-		case SCAN_CHANNEL_CHANGE:
-			if(telemetry_link == 0) {
-				max_count = 0;
-				max_rssi = 0;
-				rf_ch_num++;
-				if (rf_ch_num >= (SCAN_MAX_RADIOCHANNEL + 1))
-					rf_ch_num = 0;
-				if (scan_tlm_index++ == 0)
-					pkt[0] = rf_ch_num;  // start channel for telemetry packet
-				Scanner_scan_next();
-				phase = SCAN_GET_RSSI;
-			}
-			return SCAN_CHANNEL_LOCK_TIME;
-		case SCAN_GET_RSSI:
-			rssi = Scanner_scan_rssi();
-			if(rssi >= max_rssi) {
-				max_rssi = rssi;
-				pkt[scan_tlm_index] = rssi;
-			}
-			max_count++;
-			if(max_count > SCAN_MAX_COUNT) {
-				phase = SCAN_CHANNEL_CHANGE;
-				if (scan_tlm_index == SCAN_CHANS_PER_PACKET)
-				{
-					// send data to TX
-					telemetry_link = 1;
-					scan_tlm_index = 0;
-				}
+	uint8_t rssi,max_rssi;
+	
+	//!!!Blocking mode protocol!!!
+	TX_MAIN_PAUSE_off;
+	tx_resume();
+	while(1)
+	{ //Start
+		packet_in[0] = rf_ch_num;						// start channel for telemetry packet
+		for(uint8_t i=0;i<SCAN_CHANS_PER_PACKET;i++)
+		{
+			Scanner_scan_next();						// set channel
+			delayMicroseconds(SCAN_CHANNEL_LOCK_TIME);	// wait for freq to adjust
+			max_rssi = 0;
+			for(uint8_t j=0;j<SCAN_MAX_COUNT;j++)
+			{
+				rssi = Scanner_scan_rssi();
+				if(rssi >= max_rssi) max_rssi = rssi;
+				delayMicroseconds(SCAN_AVERAGE_INTVL);	// wait before next read
 			}
+			packet_in[i+1] = max_rssi;
+			//next channel
+			rf_ch_num++;
+			if (rf_ch_num >= (SCAN_MAX_RADIOCHANNEL + 1))
+				rf_ch_num = 0;
+		}
+		telemetry_link = 1;
+		do
+		{
+			if(Update_All())
+				return 1000;							// protocol has changed, give back the control to main
+		}
+		while(telemetry_link == 1);
 	}
-	return SCAN_AVERAGE_INTVL;
+	return 0;
 }
 
 uint16_t initScanner(void)
 {
-	rf_ch_num = SCAN_MAX_RADIOCHANNEL;
-	scan_tlm_index = 0;
+	rf_ch_num = 0;
 	telemetry_link = 0;
-	phase = SCAN_CHANNEL_CHANGE;
 	Scanner_cc2500_init();
 	CC2500_Strobe(CC2500_SRX);
 	Scanner_calibrate();

Multiprotocol/Symax_nrf24l01.ino

@@ -359,6 +359,9 @@ uint16_t symax_callback()
 			}
 			break;
 		case SYMAX_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(SYMAX_PACKET_PERIOD);
+			#endif
 			SYMAX_send_packet(0);
 			break;
 	}

Multiprotocol/TRAXXAS_cyrf6936.ino

@@ -162,6 +162,9 @@ uint16_t ReadTRAXXAS()
 			TRAXXAS_cyrf_data_config();
 			phase++;
 		case TRAXXAS_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(13940);
+			#endif
 			TRAXXAS_send_data_packet();
 			break;
 	}

Multiprotocol/V2X2_nrf24l01.ino

@@ -264,6 +264,9 @@ uint16_t ReadV2x2()
 		case V202_DATA:
 			if (packet_sent && NRF24L01_packet_ack() != PKT_ACKED)
 				return V2X2_PACKET_CHKTIME;
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(V2X2_PACKET_PERIOD);
+			#endif
 			V2X2_send_packet(0);
 			break;
 	}

Multiprotocol/V761_nrf24l01.ino

@@ -174,6 +174,9 @@ uint16_t V761_callback()
 			}
 			return 15730;
 		case V761_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(V761_PACKET_PERIOD);
+			#endif
 			V761_send_packet();
 			break;
 	}

Multiprotocol/V911S_nrf24l01.ino

@@ -111,7 +111,12 @@ static void __attribute__((unused)) V911S_initialize_txid()
 uint16_t V911S_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(V911S_PACKET_PERIOD);
+		#endif
 		V911S_send_packet(0);
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/Validate.h

@@ -19,9 +19,9 @@
 #endif
 
 // Check for minimum board file definition version for DIY multi-module boards
-#define MIN_AVR_BOARD 109
-#define MIN_ORX_BOARD 109
-#define MIN_STM32_BOARD 116
+#define MIN_AVR_BOARD 110
+#define MIN_ORX_BOARD 110
+#define MIN_STM32_BOARD 117
 //AVR
 #if (defined(ARDUINO_MULTI_NO_BOOT) && ARDUINO_MULTI_NO_BOOT < MIN_AVR_BOARD) || (defined(ARDUINO_MULTI_FLASH_FROM_TX) && ARDUINO_MULTI_FLASH_FROM_TX < MIN_AVR_BOARD)
 	#error You need to update your Multi 4-in-1 board definition.  Open Boards Manager and update to the latest version of the Multi 4-in-1 AVR Boards.
@@ -104,6 +104,11 @@
 		#error "The SFHSS forced frequency tuning value is outside of the range -127..127."
 	#endif
 #endif
+#ifdef FORCE_HOTT_TUNING
+	#if ( FORCE_HOTT_TUNING < -127 ) || ( FORCE_HOTT_TUNING > 127 )
+		#error "The HOTT forced frequency tuning value is outside of the range -127..127."
+	#endif
+#endif
 //A7105
 #ifdef FORCE_AFHDS2A_TUNING
 	#if ( FORCE_AFHDS2A_TUNING < -300 ) || ( FORCE_AFHDS2A_TUNING > 300 )
@@ -174,10 +179,12 @@
 	#undef AFHDS2A_A7105_INO
 	#undef BUGS_A7105_INO
 	#undef FLYZONE_A7105_INO
+	#undef AFHDS2A_RX_A7105_INO
 #endif
 #ifndef CYRF6936_INSTALLED
 	#undef	DEVO_CYRF6936_INO
 	#undef	DSM_CYRF6936_INO
+	#undef	HOTT_CC2500_INO
 	#undef	J6PRO_CYRF6936_INO
 	#undef	WFLY_CYRF6936_INO
 	#undef	WK2x01_CYRF6936_INO
@@ -193,7 +200,8 @@
 	#undef	HITEC_CC2500_INO
 	#undef	XN297L_CC2500_EMU
 	#undef	SCANNER_CC2500_INO
-	#undef	FRSKYX_RX_CC2500_INO
+	#undef	FRSKY_RX_CC2500_INO
+	#undef	HOTT_CC2500_INO
 #endif
 #ifndef NRF24L01_INSTALLED
 	#undef	BAYANG_NRF24L01_INO
@@ -246,14 +254,17 @@
 	#undef NCC1701_HUB_TELEMETRY
 	#undef HUB_TELEMETRY
 	#undef SPORT_TELEMETRY
-	#undef SPORT_POLLING
+	#undef SPORT_SEND
 	#undef DSM_TELEMETRY
 	#undef MULTI_STATUS
 	#undef MULTI_TELEMETRY
 	#undef SCANNER_TELEMETRY
 	#undef SCANNER_CC2500_INO
-	#undef FRSKYX_RX_TELEMETRY
-	#undef FRSKYX_RX_CC2500_INO
+	#undef FRSKY_RX_TELEMETRY
+	#undef FRSKY_RX_CC2500_INO
+	#undef AFHDS2A_RX_TELEMETRY
+	#undef AFHDS2A_RX_A7105_INO
+	#undef HOTT_FW_TELEMETRY
 #else
 	#if defined(MULTI_TELEMETRY) && defined(MULTI_STATUS)
 		#error You should choose either MULTI_TELEMETRY or MULTI_STATUS but not both.
@@ -262,9 +273,13 @@
 		#undef SCANNER_TELEMETRY
 		#undef SCANNER_CC2500_INO
 	#endif
-	#if not defined(FRSKYX_RX_CC2500_INO) || not defined(FRSKYX_RX_TELEMETRY)
-		#undef FRSKYX_RX_TELEMETRY
-		#undef FRSKYX_RX_CC2500_INO
+	#if not defined(FRSKY_RX_CC2500_INO) || not defined(FRSKY_RX_TELEMETRY)
+		#undef FRSKY_RX_TELEMETRY
+		#undef FRSKY_RX_CC2500_INO
+	#endif
+	#if not defined(AFHDS2A_RX_A7105_INO) || not defined(AFHDS2A_RX_TELEMETRY)
+		#undef AFHDS2A_RX_TELEMETRY
+		#undef AFHDS2A_RX_A7105_INO
 	#endif
 	#if not defined(BAYANG_NRF24L01_INO)
 		#undef BAYANG_HUB_TELEMETRY
@@ -294,24 +309,38 @@
 	#endif
 	#if not defined(FRSKYX_CC2500_INO)
 		#undef SPORT_TELEMETRY
-		#undef SPORT_POLLING
+		#undef SPORT_SEND
 	#endif
-	#if not defined (SPORT_TELEMETRY) || not defined (STM32_BOARD)
-		#undef SPORT_POLLING
-	#endif
-	#if defined SPORT_POLLING && not defined INVERT_TELEMETRY
-		#error SPORT_POLLING has been defined but not INVERT_TELEMETRY. They should be both enabled to work.
+	#if not defined (SPORT_TELEMETRY)
+		#undef SPORT_SEND
 	#endif
 	#if not defined(DSM_CYRF6936_INO)
 		#undef DSM_TELEMETRY
 	#endif
-	#if not defined(DSM_TELEMETRY) && not defined(SPORT_TELEMETRY) && not defined(HUB_TELEMETRY) && not defined(HUBSAN_HUB_TELEMETRY) && not defined(BUGS_HUB_TELEMETRY) && not defined(NCC1701_HUB_TELEMETRY) && not defined(BAYANG_HUB_TELEMETRY) && not defined(CABELL_HUB_TELEMETRY) && not defined(AFHDS2A_HUB_TELEMETRY) && not defined(AFHDS2A_FW_TELEMETRY) && not defined(MULTI_TELEMETRY) && not defined(MULTI_STATUS) && not defined(HITEC_HUB_TELEMETRY) && not defined(HITEC_FW_TELEMETRY) && not defined(SCANNER_TELEMETRY) && not defined(FRSKYX_RX_TELEMETRY)
+	#if not defined(HOTT_CC2500_INO)
+		#undef HOTT_FW_TELEMETRY
+	#endif
+	#if not defined(HOTT_FW_TELEMETRY) && not defined(DSM_TELEMETRY) && not defined(SPORT_TELEMETRY) && not defined(HUB_TELEMETRY) && not defined(HUBSAN_HUB_TELEMETRY) && not defined(BUGS_HUB_TELEMETRY) && not defined(NCC1701_HUB_TELEMETRY) && not defined(BAYANG_HUB_TELEMETRY) && not defined(CABELL_HUB_TELEMETRY) && not defined(AFHDS2A_HUB_TELEMETRY) && not defined(AFHDS2A_FW_TELEMETRY) && not defined(MULTI_TELEMETRY) && not defined(MULTI_STATUS) && not defined(HITEC_HUB_TELEMETRY) && not defined(HITEC_FW_TELEMETRY) && not defined(SCANNER_TELEMETRY) && not defined(FRSKY_RX_TELEMETRY) && not defined(AFHDS2A_RX_TELEMETRY)
 		#undef TELEMETRY
 		#undef INVERT_TELEMETRY
-		#undef SPORT_POLLING
+		#undef MULTI_TELEMETRY
+		#undef MULTI_STATUS
 	#endif
 #endif
 
+#ifdef SPORT_TELEMETRY
+	#define SPORT_SEND
+#endif
+
+#if not defined(STM32_BOARD)
+	#undef MULTI_SYNC
+#endif
+
+#if not defined(MULTI_TELEMETRY)
+	#undef MULTI_SYNC
+	#undef MULTI_NAMES
+#endif
+
 //Make sure TX is defined correctly
 #ifndef AILERON
 	#error You must select a correct channel order.

Multiprotocol/WFLY_cyrf6936.ino

@@ -194,25 +194,25 @@ uint16_t ReadWFLY()
 				debugln("L=%02X",len)
 				if(len==0x10)
 				{
-					CYRF_ReadDataPacketLen(pkt, len);
+					CYRF_ReadDataPacketLen(packet_in, len);
 					debug("RX=");
 					for(uint8_t i=0;i<0x0F;i++)
 					{
-						debug(" %02X",pkt[i]);
-						if(pkt[i]==packet[i])
+						debug(" %02X",packet_in[i]);
+						if(packet_in[i]==packet[i])
 							check++;							// Verify quickly the content
-						sum+=pkt[i];
+						sum+=packet_in[i];
 					}
-					debugln(" %02X",pkt[15]);
-					if(sum==pkt[15] && check>=10)
+					debugln(" %02X",packet_in[15]);
+					if(sum==packet_in[15] && check>=10)
 					{ // Good packet received
-						if(pkt[2]==0x64)
+						if(packet_in[2]==0x64)
 						{ // Switch to normal mode
 							BIND_DONE;
 							phase=WFLY_PREP_DATA;
 							return 10000;
 						}
-						memcpy((void *)packet,(void *)pkt,0x10);	// Send back to the RX what we've just received with no modifications
+						memcpy((void *)packet,(void *)packet_in,0x10);	// Send back to the RX what we've just received with no modifications
 					}
 					phase=WFLY_BIND_TX;							
 					return 200;
@@ -232,6 +232,9 @@ uint16_t ReadWFLY()
 			packet_count=0;
 			phase++;
 		case WFLY_DATA:
+			#ifdef MULTI_SYNC
+				telemetry_set_input_sync(5371);
+			#endif
 			start=micros();
 			while ((uint8_t)((uint8_t)micros()-(uint8_t)start) < 200)
 				if((CYRF_ReadRegister(CYRF_02_TX_CTRL) & 0x80) == 0x00)

Multiprotocol/WK2x01_cyrf6936.ino

@@ -435,6 +435,9 @@ uint16_t WK_cb()
 {
 	if (packet_sent == 0)
 	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(2800);
+		#endif
 		packet_sent = 1;
 		if(sub_protocol == WK2801)
 			WK_BuildPacket_2801();

Multiprotocol/XN297Dump_nrf24l01.ino

@@ -176,6 +176,10 @@ static void __attribute__((unused)) XN297Dump_overflow()
 static uint16_t XN297Dump_callback()
 {
 	static uint32_t time=0;
+
+	//!!!Blocking mode protocol!!!
+	TX_MAIN_PAUSE_off;
+	tx_resume();
 	while(1)
 	{
 		if(option==0xFF && bind_counter>XN297DUMP_PERIOD_SCAN)

Multiprotocol/YD717_nrf24l01.ino

@@ -155,7 +155,12 @@ static void __attribute__((unused)) yd717_init()
 uint16_t yd717_callback()
 {
 	if(IS_BIND_DONE)
+	{
+		#ifdef MULTI_SYNC
+			telemetry_set_input_sync(YD717_PACKET_PERIOD);
+		#endif
 		yd717_send_packet(0);
+	}
 	else
 	{
 		if (bind_counter == 0)

Multiprotocol/ZSX_nrf24l01.ino

@@ -80,6 +80,9 @@ static void __attribute__((unused)) ZSX_init()
 
 uint16_t ZSX_callback()
 {
+	#ifdef MULTI_SYNC
+		telemetry_set_input_sync(ZSX_PACKET_PERIOD);
+	#endif
 	if(IS_BIND_IN_PROGRESS)
 		if(--bind_counter==0)
 		{

Multiprotocol/_Config.h

@@ -54,7 +54,7 @@
 /*** AUTO BIND ***/  // Also referred as "Bind on powerup"
 /*****************/
 //Bind from channel enables you to bind when a specified channel is going from low to high. This feature is only active
-// if you specify AUTOBIND in PPM mode or set AutoBind to YES for serial mode. It also requires that the throttle channel is low.
+// if you specify AUTOBIND in PPM mode or set AutoBind to YES for serial mode.
 //Comment to globaly disable the bind feature from a channel.
 #define ENABLE_BIND_CH
 //Set the channel number used for bind. Default is 16.
@@ -87,17 +87,18 @@
 //#define ORANGE_TX_BLUE
 
 /** CC2500 Fine Frequency Tuning **/
-//For optimal performance the CC2500 RF module used by the FrSkyD, FrSkyV, FrSkyX, SFHSS, CORONA, Redpine and Hitec protocols needs to be tuned for each protocol.
-//Initial tuning should be done via the radio menu with a genuine FrSky/Futaba/CORONA/Hitec/Redpine receiver.  
+//For optimal performance the CC2500 RF module used by the CORONA, FrSkyD, FrSkyV, FrSkyX, Hitec, HoTT, SFHSS and Redpine protocols needs to be tuned for each protocol.
+//Initial tuning should be done via the radio menu with a genuine CORONA/FrSky/Hitec/HoTT/Futaba/Redpine receiver.  
 //Once a good tuning value is found it can be set here and will override the radio's 'option' setting for all existing and new models which use that protocol.
 //For more information: https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/tree/master/docs/Frequency_Tuning.md
 //Uncomment the lines below (remove the "//") and set an appropriate value (replace the "0") to enable. Valid range is -127 to +127.
+//#define FORCE_CORONA_TUNING	0
 //#define FORCE_FRSKYD_TUNING	0
 //#define FORCE_FRSKYV_TUNING	0
 //#define FORCE_FRSKYX_TUNING	0
 //#define FORCE_SFHSS_TUNING	0
-//#define FORCE_CORONA_TUNING	0
 //#define FORCE_HITEC_TUNING	0
+//#define FORCE_HOTT_TUNING		0
 //#define FORCE_REDPINE_TUNING	0
 
 /** A7105 Fine Frequency Tuning **/
@@ -157,6 +158,7 @@
 
 //The protocols below need an A7105 to be installed
 #define	AFHDS2A_A7105_INO
+#define AFHDS2A_RX_A7105_INO
 #define	BUGS_A7105_INO
 #define	FLYSKY_A7105_INO
 #define	FLYZONE_A7105_INO
@@ -175,8 +177,9 @@
 #define	FRSKYD_CC2500_INO
 #define	FRSKYV_CC2500_INO
 #define	FRSKYX_CC2500_INO
-#define	FRSKYX_RX_CC2500_INO
+#define	FRSKY_RX_CC2500_INO
 #define	HITEC_CC2500_INO
+#define	HOTT_CC2500_INO
 #define	SCANNER_CC2500_INO
 #define	SFHSS_CC2500_INO
 #define	REDPINE_CC2500_INO
@@ -221,6 +224,12 @@
 /*** PROTOCOLS SETTINGS  ***/
 /***************************/
 
+//FrSkyX specific setting
+//-----------------------
+//EU LBT setting: if commented the TX will not check if a channel is busy before transmitting.
+//!!! Work in progress !!! it's currently known to cause telemerty issues. Enable only if you know what you are doing.
+//#define FRSKYX_LBT
+
 //DSM specific settings
 //---------------------
 //The DSM protocol is using by default the Spektrum throw of 1100..1900us @100% and 1000..2000us @125%.
@@ -257,24 +266,31 @@
 
 //Comment to invert the polarity of the output telemetry serial signal.
 //This function takes quite some flash space and processor power on an atmega.
-//For OpenTX it must be uncommented.
-//On a 9XR_PRO running ersky9x both commented and uncommented will work depending on the radio setting Invert COM1 under the Telemetry menu.
-//On other addon/replacement boards like the 9xtreme board or the Ar9x board running ersky9x, you need to uncomment the line below.
+//For a Taranis/T16 with an external module it must be uncommented. For a T16 internal module it must be commented.
+//A 9XR_PRO running erskyTX will work with both commented and uncommented depending on the radio setting Invert COM1 under the Telemetry menu.
+//On other addon/replacement boards like the 9xtreme board or the Ar9x board running erskyTX, you need to uncomment the line below.
 //For er9x it depends if you have an inveter mod or not on the telemetry pin. If you don't have an inverter comment this line.
+//=>OpenTX 2.3.2 with a STM32 or OrangeRX module this setting can be ignored.
 #define INVERT_TELEMETRY
+//For STM32 and OrangeRX modules, comment to prevent the TX from forcing the serial telemetry polarity normal/invert.
+#define INVERT_TELEMETRY_TX
 
-//Comment if you don't want to send Multi status telemetry frames (Protocol available, Bind in progress, version...)
-//Use with er9x/erksy9x, for OpenTX MULTI_TELEMETRY below is preferred instead
+//Uncomment if you want to send Multi status telemetry frames (Protocol available, Bind in progress, version...)
+//Use with er9x/erskyTX, for OpenTX you must select MULTI_TELEMETRY below
 //#define MULTI_STATUS
 
-//Uncomment to send Multi status and allow OpenTX to autodetect the telemetry format
-//Supported by OpenTX version 2.2 RC9 and newer. NOT supported by er9x/ersky9x use MULTI_STATUS instead.
+//Sends Multi status and allow OpenTX to autodetect the telemetry format. Comment to disable.
+//Supported by OpenTX version 2.2 RC9 and newer. NOT supported by er9x/erskyTX use MULTI_STATUS instead.
 #define MULTI_TELEMETRY
+//Send to OpenTX the current protocol and subprotocol names. Comment to disable.
+#define MULTI_NAMES
+//Work in progress: Sync OpenTX frames with the current protocol timing. This feature is only available on the STM32 module. Uncomment to enable.
+//#define MULTI_SYNC
 
 //Comment a line to disable a specific protocol telemetry
-#define DSM_TELEMETRY				// Forward received telemetry packet directly to TX to be decoded by er9x, ersky9x and OpenTX
-#define SPORT_TELEMETRY				// Use FrSkyX SPORT format to send telemetry to TX
-#define AFHDS2A_FW_TELEMETRY		// Forward received telemetry packet directly to TX to be decoded by ersky9x and OpenTX
+#define DSM_TELEMETRY				// Forward received telemetry packet directly to TX to be decoded by er9x, erskyTX and OpenTX
+#define SPORT_TELEMETRY				// Use FrSkyX format to send/receive telemetry
+#define AFHDS2A_FW_TELEMETRY		// Forward received telemetry packet directly to TX to be decoded by erskyTX and OpenTX
 #define AFHDS2A_HUB_TELEMETRY		// Use FrSkyD Hub format to send basic telemetry to TX like er9x
 #define HUB_TELEMETRY				// Use FrSkyD Hub format to send telemetry to TX
 #define BAYANG_HUB_TELEMETRY		// Use FrSkyD Hub format to send telemetry to TX
@@ -282,17 +298,12 @@
 #define HUBSAN_HUB_TELEMETRY		// Use FrSkyD Hub format to send telemetry to TX
 #define NCC1701_HUB_TELEMETRY		// Use FrSkyD Hub format to send telemetry to TX
 #define CABELL_HUB_TELEMETRY		// Use FrSkyD Hub format to send telemetry to TX
-#define HITEC_HUB_TELEMETRY			// Use FrSkyD Hub format to send basic telemetry to the radios which can decode it like er9x, ersky9x and OpenTX
-#define HITEC_FW_TELEMETRY			// Under development: Forward received telemetry packets to be decoded by ersky9x and OpenTX
+#define HITEC_HUB_TELEMETRY			// Use FrSkyD Hub format to send basic telemetry to the radios which can decode it like er9x, erskyTX and OpenTX
+#define HITEC_FW_TELEMETRY			// Forward received telemetry packets to be decoded by erskyTX and OpenTX
 #define SCANNER_TELEMETRY			// Forward spectrum scanner data to TX
-#define FRSKYX_RX_TELEMETRY			// Forward channels data to TX
-
-//SPORT_POLLING is an implementation of the same polling routine as XJT module for sport telemetry bidirectional communication.
-//This is useful for passing sport control frames from TX to RX(ex: changing Betaflight PID or VTX channels on the fly using LUA scripts with OpentX).
-//Using this feature requires to uncomment INVERT_TELEMETRY as this TX output on telemetry pin only inverted signal.
-//!!!! This is a work in progress!!! Do not enable unless you want to test and report
-//#define SPORT_POLLING
-
+#define FRSKY_RX_TELEMETRY			// Forward channels data to TX
+#define AFHDS2A_RX_TELEMETRY		// Forward channels data to TX
+#define HOTT_FW_TELEMETRY			// Forward received telemetry packets to be decoded by erskyTX and OpenTX
 
 /****************************/
 /*** SERIAL MODE SETTINGS ***/
@@ -343,6 +354,10 @@
 // The default value is 16 to receive all possible channels but you might want to filter some "bad" channels from the PPM frame like the ones above 6 on the Walkera PL0811.
 #define MAX_PPM_CHANNELS 16
 
+/** Telemetry **/
+//Send simple FrSkyX telemetry using the FrSkyD telemetry format
+#define TELEMETRY_FRSKYX_TO_FRSKYD
+
 /** Rotary Switch Protocol Selector Settings **/
 //The table below indicates which protocol to run when a specific position on the rotary switch has been selected.
 //All fields and values are explained below. Everything is configurable from here like in the Serial mode.
@@ -476,6 +491,8 @@ const PPM_Parameters PPM_prot[14*NBR_BANKS]=	{
 		PPM_IBUS
 		PWM_SBUS
 		PPM_SBUS
+	PROTO_AFHDS2A_RX
+		NONE
 	PROTO_ASSAN
 		NONE
 	PROTO_BAYANG
@@ -546,9 +563,8 @@ const PPM_Parameters PPM_prot[14*NBR_BANKS]=	{
 		CH_8
 		EU_16
 		EU_8
-	PROTO_FRSKYX_RX
-		FRSKYX_FCC
-		FRSKYX_LBT
+	PROTO_FRSKY_RX
+		NONE
 	PROTO_FY326
 		FY326
 		FY319
@@ -574,6 +590,8 @@ const PPM_Parameters PPM_prot[14*NBR_BANKS]=	{
 		JJRCX1
 		X5C1
 		FQ777_951
+	PROTO_HOTT
+		NONE
 	PROTO_HUBSAN
 		H107
 		H301

Protocols_Details.md

@@ -29,7 +29,7 @@ Here are detailed descriptions of every supported protocols (sorted by RF module
 ## Protocol selection in PPM mode
 The protocol selection is based on 2 parameters:
   * selection switch: this is the rotary switch on the module numbered from 0 to 15
-      - switch position 0 is to select the Serial mode for er9x/ersky9x/OpenTX radio
+      - switch position 0 is to select the Serial mode for er9x/erskyTX/OpenTX radio
       - switch position 15 is to select the bank
 	  - switch position 1..14 will select the protocol 1..14 in the bank *X*
   * banks are used to increase the amount of accessible protocols by the switch. There are up to 5 banks giving acces to up to 70 protocol entries (5 * 14).  To modify or verify which bank is currenlty active do the following:
@@ -56,7 +56,7 @@ Notes:
 Serial mode is selected by placing the rotary switch to position 0 before power on of the radio.
 
 You've upgraded the module but the radio does not display the name of the protocol you are loking for:
- * ersky9x:
+ * erskyTX:
       - Place the file [Multi.txt](https://raw.githubusercontent.com/pascallanger/DIY-Multiprotocol-TX-Module/master/Multiprotocol/Multi.txt) (which is part of the MPM source files) on the root of your SD card.
       - If the entry still does not appear or is broken, [upgrade](https://openrcforums.com/forum/viewtopic.php?f=7&t=4676) to version R222d2 or newer.
  * OpenTX:
@@ -84,6 +84,7 @@ CFlie|38|CFlie||||||||NRF24L01|
 [ESky150](Protocols_Details.md#ESKY150---35)|35|ESKY150||||||||NRF24L01|
 [Flysky](Protocols_Details.md#FLYSKY---1)|1|Flysky|V9x9|V6x6|V912|CX20||||A7105|
 [Flysky AFHDS2A](Protocols_Details.md#FLYSKY-AFHDS2A---28)|28|PWM_IBUS|PPM_IBUS|PWM_SBUS|PPM_SBUS|||||A7105|
+[Flysky AFHDS2A RX](Protocols_Details.md#FLYSKY-AFHDS2A-RX---56)|56|||||||||A7105|
 [Flyzone](Protocols_Details.md#FLYZONE---53)|53|FZ410||||||||A7105|
 [FQ777](Protocols_Details.md#FQ777---23)|23|FQ777||||||||NRF24L01|SSV7241
 [FrskyD](Protocols_Details.md#FRSKYD---3)|3|FrskyD||||||||CC2500|
@@ -97,6 +98,7 @@ CFlie|38|CFlie||||||||NRF24L01|
 [Hisky](Protocols_Details.md#HISKY---4)|4|Hisky|HK310|||||||NRF24L01|
 [Hitec](Protocols_Details.md#HITEC---39)|39|OPT_FW|OPT_HUB|MINIMA||||||CC2500|
 [Hontai](Protocols_Details.md#HONTAI---26)|26|HONTAI|JJRCX1|X5C1|FQ777_951|||||NRF24L01|XN297
+[HoTT](Protocols_Details.md#HoTT---57)|57|||||||||CC2500|
 [Hubsan](Protocols_Details.md#HUBSAN---2)|2|H107|H301|H501||||||A7105|
 [J6Pro](Protocols_Details.md#J6Pro---22)|22|J6PRO||||||||CYRF6936|
 [KF606](Protocols_Details.md#KF606---49)|49|KF606*||||||||NRF24L01|XN297
@@ -165,11 +167,11 @@ Extended limits and failsafe supported
 
 Telemetry enabled protocol:
  - by defaut using FrSky Hub protocol (for example er9x): RX(A1), battery voltage FS-CVT01(A2) and RX&TX RSSI
- - if using ersky9x and OpenTX: full telemetry information available
+ - if using erskyTX and OpenTX: full telemetry information available
 
 Option is used to change the servo refresh rate. A value of 0 gives 50Hz (min), 70 gives 400Hz (max). Specific refresh rate value can be calculated like this option=(refresh_rate-50)/5.
 
-**RX_Num is used to give a number a given RX. You must use a different RX_Num per RX. A maximum of 16 AFHDS2A RXs are supported.**
+**RX_Num is used to give a number a given RX. You must use a different RX_Num per RX. A maximum of 64 AFHDS2A RXs are supported.**
 
 OpenTX suggested RSSI alarm threshold settings (Telemetry tab): Low=15, Critical=12.
 
@@ -188,10 +190,19 @@ Note that the RX ouput will be AETR whatever the input channel order is.
 ### Sub_protocol PWM_SBUS - *2*
 ### Sub_protocol PPM_SBUS - *3*
 
+## FLYSKY AFHDS2A RX - *56*
+The Flysky AFHDS2A receiver protocol enables master/slave trainning, separate access from 2 different radios to the same model,...
+
+Available in OpenTX 2.3.2, Trainer Mode Master/Multi
+
+Extended limits supported
+
+Low power: enable/disable the LNA stage on the RF component to use depending on the distance with the TX.
+
 ## FLYZONE - *53*
 Models using the Flyzone FZ-410 TX: Fokker D.VII Micro EP RTF
 
-Models using the old ARES TX (prior to Hitec RED): Tiger Moth
+Models using the old ARES TX (prior to Hitec RED): Tiger Moth, eRC Micro Stik
 
 CH1|CH2|CH3|CH4
 ---|---|---|---
@@ -345,6 +356,8 @@ CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
 ## FRSKYX_RX - *55*
 The FrSkyX receiver protocol enables master/slave trainning, separate access from 2 different radios to the same model,...
 
+Available in OpenTX 2.3.2, Trainer Mode Master/Multi
+
 Extended limits supported
 
 Option for this protocol corresponds to fine frequency tuning.
@@ -383,20 +396,40 @@ CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9
 ### Sub_protocol OPT_FW - *0*
 OPTIMA RXs
 
-Full telemetry available on ersky9x and OpenTX. This is still a WIP.
+Full telemetry available on OpenTX 2.3.2+, still in progress for erskyTx.
 
 **The TX must be close to the RX for the bind negotiation to complete successfully**
 
 ### Sub_protocol OPT_HUB - *1*
 OPTIMA RXs
 
-Basic telemetry using FrSky Hub on er9x, ersky9x, OpenTX and any radio with FrSky telemetry support with RX voltage, VOLT2 voltage, TX RSSI and TX LQI. 
+Basic telemetry using FrSky Hub on er9x, erskyTX, OpenTX and any radio with FrSky telemetry support with RX voltage, VOLT2 voltage, TX RSSI and TX LQI. 
 
 **The TX must be close to the RX for the bind negotiation to complete successfully**
 
 ### Sub_protocol MINIMA - *2*
 MINIMA, MICRO and RED receivers
 
+## HoTT - *57*
+Models: Graupner HoTT receivers (tested on GR-12L and GR-16L).
+
+Extended limits  and failsafe supported
+
+**RX_Num is used to give a number a given RX. You must use a different RX_Num per RX. A maximum of 64 HoTT RXs are supported.**
+
+**Failsafe MUST be configured once with the desired channel values (hold or position) while the RX is up (wait 10+sec for the RX to learn the config) and then failsafe MUST be set to RX/Receiver otherwise the servos will jitter!!!**
+
+The RX features configuration are done using the OpenTX script "Graupner HoTT.lua" .
+
+Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and **must** be accurate otherwise the link will not be stable.
+Check the [Frequency Tuning page](/docs/Frequency_Tuning.md) to determine it.
+
+CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12
+---|---|---|---|---|---|---|---|---|----|----|----
+CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12
+
+Basic telemetry is available on OpenTX 2.3.2+ with RX voltage, Rx temperature, RX RSSI, RX LQI, TX RSSI and TX LQI.
+
 ## SFHSS - *21*
 Models: Futaba RXs and XK models.
 
@@ -537,7 +570,7 @@ Notes:
  - RX output will match the Spektrum standard TAER independently of the input configuration AETR, RETA...
  - RX output will match the Spektrum standard throw (1500µs +/- 400µs -> 1100..1900µs) for a 100% input. This is true for both Serial and PPM input. For PPM, make sure the end points PPM_MIN_100 and PPM_MAX_100 in _config.h are matching your TX ouput. The maximum ouput is 1000..2000µs based on an input of 125%.
     - If you want to override the above and get maximum throw (old way) uncomment in _config.h the line #define DSM_MAX_THROW . In this mode to achieve standard throw use a channel weight of 84%.
- - TH_KILL is a feature which is enabled on channel 14 by default (can be disabled/changed) in the _config.h file. Some models (X-Vert, Blade 230S...) require a special position to instant stop the motor(s). If the channel 15 is above -50% the throttle is untouched but if it is between -50% and -100%, the throttle output will be forced between -100% and -150%. For example, a value of -80% applied on channel 14 will instantly kill the motors on the X-Vert.
+ - TH_KILL is a feature which is enabled on channel 14 by default (can be disabled/changed) in the _config.h file. Some models (X-Vert, Blade 230S...) require a special position to instant stop the motor(s). If the channel 14 is above -50% the throttle is untouched but if it is between -50% and -100%, the throttle output will be forced between -100% and -150%. For example, a value of -80% applied on channel 14 will instantly kill the motors on the X-Vert.
 
 ### Sub_protocol DSM2_22 - *0*
 DSM2, Resolution 1024, refresh rate 22ms
@@ -550,9 +583,9 @@ DSMX, Resolution 2048, refresh rate 11ms
 ### Sub_protocol AUTO - *4*
 The "AUTO" feature enables the TX to automatically choose what are the best settings for your DSM RX and update your model protocol settings accordingly.
 
-The current radio firmware which are able to use the "AUTO" feature are ersky9x (9XR Pro, 9Xtreme, Taranis, ...), er9x for M128(9XR)&M2561 and OpenTX (mostly Taranis).
+The current radio firmware which are able to use the "AUTO" feature are erskyTX (9XR Pro, 9Xtreme, Taranis, ...), er9x for M128(9XR)&M2561 and OpenTX (mostly Taranis).
 For these firmwares, you must have a telemetry enabled TX and you have to make sure you set the Telemetry "Usr proto" to "DSMx".
-Also on er9x you will need to be sure to match the polarity of the telemetry serial (normal or inverted by bitbashing), while on ersky9x you can set "Invert COM1" accordinlgy.
+Also on er9x you will need to be sure to match the polarity of the telemetry serial (normal or inverted by bitbashing), while on erskyTX you can set "Invert COM1" accordinlgy.
 
 ## J6Pro - *22*
 

README.md

@@ -19,9 +19,9 @@ If you like this project and want to support further development please consider
 
 ## Development status
 
-Current Multiprotocol code check status: [![Travis Build Status for Multi](https://api.travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module.svg)](https://travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module)
+Current Multiprotocol code check status: [![Travis Build Status for Multi](https://api.travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module.svg?branch=master)](https://travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module)
 
-Current Multiprotocol boards check status: [![Travis Build Status for Multi Boards](https://api.travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module-Boards.svg)](https://travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module-Boards)
+Current Multiprotocol boards check status: [![Travis Build Status for Multi Boards](https://api.travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module-Boards.svg?branch=master)](https://travis-ci.org/pascallanger/DIY-Multiprotocol-TX-Module-Boards)
 
 
 ## Quicklinks
@@ -40,6 +40,7 @@ Current Multiprotocol boards check status: [![Travis Build Status for Multi Boar
     * [STM32 Multiprotocol Module](docs/Compiling_STM32.md)
     * [OrangeRX Module](docs/Compiling_OrangeTx.md)
 1. [Transmitter Setup](docs/Transmitters.md) 
+    * [Channel Order](docs/Channel_Order.md)
 1. [How to for popular models](docs/Models.md)
 1. [Troubleshooting](docs/Troubleshooting.md)
 2. [Advanced Topics (not for the fainthearted!)](docs/Advanced_Topics.md)

buildroot/bin/opt_replace

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+SED=$(which gsed || which sed)
+
+eval "${SED} -i 's/#define \b${1}\b$/#define ${2}/g' Multiprotocol/_Config.h"

docs/BOM_DIY_ATmega.md

@@ -22,14 +22,14 @@ Qty|Part|Description|Value|Package|Digikey Part Number
 1|U4 U6|Pin header|1x10||[S1011EC-40-ND](https://www.digikey.com/product-detail/en/sullins-connector-solutions/PRPC040SAAN-RC/S1011EC-40-ND/2775214)
 1|P1|ISP|2x3||[3M9459-ND](http://www.digikey.com/product-search/en?keywords=3M%20961206-6404-AR)
 1|P2|Receptacle|5-pin||[WM14512-ND](http://www.digikey.com/product-search/en?keywords=Molex%2C%20LLC%200022142054)
-2|R4 R6|Resistor|1K|0603|[P1.0KGCT-ND](http://www.digikey.com/product-search/en?keywords=P1.0KGCT-ND)
-1|R2|Resistor|2.2K|0603|[P2.2KGCT-ND](http://www.digikey.com/product-search/en?keywords=P2.2KGCT-ND)
-2|R1 R3|Resistor|10k|0603|[P10KGCT-ND](http://www.digikey.com/product-search/en?keywords=P10KGCT-ND)
-1|R5|Resistor|20K|0603|[P20KGCT-ND](http://www.digikey.com/product-search/en?keywords=P20KGCT-ND)
+1|R1|Resistor|10k|0603|[P10KGCT-ND](http://www.digikey.com/product-search/en?keywords=P10KGCT-ND)
+2|R2 R5 R7|Resistor|2.2K|0603|[P2.2KGCT-ND](http://www.digikey.com/product-search/en?keywords=P2.2KGCT-ND)
+2|R3 R4 R6|Resistor|1K|0603|[P1.0KGCT-ND](http://www.digikey.com/product-search/en?keywords=P1.0KGCT-ND)
+1|R8|Resistor|470|0603|[P470GCT-ND](https://www.digikey.com/products/en?keywords=P470GCT-ND)
 1|SW1|Hex Switch||4-DIP|[FR01KR16P-W-S-ND](https://www.digikey.com/product-detail/en/nkk-switches/FR01KR16P-W-S/FR01KR16P-W-S-ND/2104098)
 1|Sw2|Momentary Switch||6mm|[	450-1643-ND](https://www.digikey.com/product-detail/en/te-connectivity-alcoswitch-switches/2-1825910-7/450-1642-ND/1632528)
 1|SW3|Momentary Switch||6mm|[CKN9104CT-ND](http://www.digikey.com/product-search/en?keywords=CKN9104CT-ND)
 1|U1|Voltage reg 5V|AMS1117-50|SOT223|[LM1117MP-5.0/NOPBCT-ND](https://www.digikey.com/product-detail/en/texas-instruments/LM1117MP-5.0-NOPB/LM1117MP-5.0-NOPBCT-ND/363589)
 1|U2|Voltage reg 3.3V|AMS1117-33|SOT223|[LM1117MPX-3.3/NOPBCT-ND](https://www.digikey.com/product-detail/en/texas-instruments/LM1117MPX-3.3-NOPB/LM1117MPX-3.3-NOPBCT-ND/1010516)
-1|X1|8 MHz Crystal|8MHz||[535-10267-1-ND](http://www.digikey.com/product-search/en?keywords=535-10267-1-ND)
+1|X1|16 MHz Crystal|16MHz||[535-10267-1-ND](http://www.digikey.com/product-search/en?keywords=535-10267-1-ND)
 1||2.4GHz Antenna|||[553-1309-ND](http://www.digikey.com/product-search/en?keywords=553-1309-ND)

docs/Channel_Order.md

@@ -0,0 +1,91 @@
+# Channel Order
+
+Channel ordering is extremely important to the Multiprotocol Module.  It is vital that the module receives channel data from the radio in the order which it expects so that it can reorder the data sent over the air into the order which the receiver requires/expects.
+
+## Background
+The Multiprotocol Module supports dozens of different protocols, many of which require channel data to be sent in a specific order (especially ones for models with integrated receiver/flight controllers).
+
+The Multiprotocol Module was designed to:
+* Enable users to control many different models or receivers using a single transmitter system
+* Work with radios where the input channels could not be reassigned
+* Make it simple to configure models without having to think about the channel order they require
+
+To address these considerations the Multiprotocol Module will internally reorder the radio's output channels to the order required by the selected protocol before transmitting the data to the receiver.
+
+The Multiprotocol Module also has functionality which depends on knowing which input channel is the throttle:
+* 'Bind on Channel' requires the throttle to be at -100% before the bind can be initiated (so that bind cannot be initiated while flying)
+* 'Throttle Kill' needs to know which channel to apply the throttle reduction to
+
+**So, the Multiprotocol Module must know what order the channel data from the radio is in.  However, because the radio does not tell the module which input is assigned to each channel, the order is fixed in the Multiprotocol Module's firmware.  This is the _expected channel order_.**
+
+## Expected Channel Order
+The expected channel order is the order in which the Multiprotocol Module expects to receive channel data from the radio.  It associates the four primary radio inputs (aileron, elevator,throttle, and rudder) to the four output channels CH1, CH2, CH3, and CH4.  In AETR, **A**ileron is on CH1, **E**levator is on CH2, **T**hrottle is on CH3, and **R**udder is on CH4.
+
+**The default expected channel order is AETR.**
+
+The Multiprotocol Module uses the expected channel order to reorder channels into the order required by the selected protocol, and to apply channel-specific features such as 'Throttle Kill'.
+
+If you are using firmware which has an expected channel order of AETR (the default), and you are using a protocol which has a fixed channel order†, you must create your radio models with a channel order of AETR, regardless of the channel order the receiver requires.  **The Multiprotocol Module will do the conversion from AETR to the required order for you.**
+
+For example, Spektrum / DSM receivers expect **TAER**.  When you configure the model in the radio you set it up in **AETR** order, the Multiprotocol Module reorders the channels before transmission, the receiver receives **TAER**, everything works as expected:
+
+Radio CH | Radio Input/Output | Module Reordering | Receiver Receives |
+| --- | --- | --- | --- | 
+| 1 | Ail | 3 -> 1 | Thr |
+| 2 | Ele | 1 -> 2 | Ail |
+| 3 | Thr | 2 -> 3 | Ele |
+| 4 | Rud | 4 -> 4 | Rud |
+
+If the radio channel order is not in the expected order (AETR) the channel reordering will be broken.
+
+For example, if the radio is configured with TAER, but the Multiprotocol module expects AETR, this will happen:
+
+Radio CH | Radio Input/Output | Module Reordering | Receiver Receives |
+| --- | --- | --- | --- | 
+| 1 | Thr | 3 -> 1 | Ele |
+| 2 | Ail | 1 -> 2 | Thr |
+| 3 | Ele | 2 -> 3 | Ail |
+| 4 | Rud | 4 -> 4 | Rud |
+
+With potentially dangerous or disasterous consequences.
+
+At best, you won't be able to arm your model because the throttle value is too high (because the receiver sees the elevator output, which is at 50%, where it expects throttle to be).  At worst the throttle will go to 50% as soon as the model binds with the radio.
+
+**†** Not all protocols have a fixed channel order, see [Protocols Without a Fixed Channel Order](#protocols-without-a-fixed-channel-order).
+
+## Setting the Expected Channel Order
+You can change the expected channel order by compiling or downloading firmware with a different channel order and flashing it to your Multiprotocol Module.
+
+1. If you compile your own firmware, modify the channel order line in the `_Config.h` file to match your preference
+2. If you flash the pre-compiled firmware from the Releases page, download the order-specific firmware image which matches your preference
+
+**After updating the Multiprotocol Module you must still ensure your radio setup matches the module's expected order.**
+
+## Changing the Channel Order on the radio
+**Your radio is not aware of the channel order expected by the Multiprotocol Module, and the module is not aware of the default channel order on your radio.**
+
+Once you have settled on a preferred channel order, and flashed your Multiprotocol Module with firmware which expects that order, you should:
+
+1. Change the Default Channel Order setting on your radio to match the Multiprotocol Module
+1. Ensure that any models which you control with the Multiprotocol Module are configured with the channel order which the Module expects
+
+**Changing the Default Channel Order only affects new models - you must manually edit existing models.**
+
+## Protocols Without a Fixed Channel Order
+The Multiprotocol Module also supports protocols which _do not_ have a specific channel order.  For these protocols the channel order _is not_ changed and will be transmitted as received from the radio.
+
+Examples of protocols which are not reordered: Corona, FrSkyD, FrSkyX, FrSkyV, Hitec, and WFly.
+
+The full list of supported protocols, including the output channel order for each of them, is available [here](../Protocols_Details.md).
+
+Where the channel table looks like this, with an input assigned to each channel, the output **is** being reordered:
+
+CH1|CH2|CH3|CH4
+---|---|---|---
+A|E|T|R
+
+Where the channel table looks like this, the output **is not** being reordered:
+
+CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
+---|---|---|---|---|---|---|---
+CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8

docs/Compiling_STM32.md

@@ -37,20 +37,25 @@ You are still unsure if your module can be flashed without tools or opening it?
 
 Your multi module is not USB upgradable ready, here is what you need:
 
-| **3.3V USB-TTL Adapter** | **4-pin Serial Programming Header** |
-|:---:|:--:|
-| <img src="images/ch340g.jpg" width="200"/> | <img src="images/4-pin-header.jpg" width="150" height="150"/> 
-| [(example ebay link)](https://www.ebay.co.uk/itm/FTDI-USB-to-TTL-Serial-Converter-Adapter-FT232RL-Module-5V-and-3-3V-Arduino-ARM/231918152528) | [(example ebay link)](https://www.ebay.co.uk/itm/4x-826629-4-Pin-header-pin-strips-AMPMODU-MOD-II-male-PIN4-straight/192334571714) |
+| **3.3V USB-TTL Adapter** | **4-pin 2.54mm Serial Programming Header** | **4-pin 1mm Serial Programming header + cable** | **5-pin 1.25mm cable** |
+|:---:|:---:|:---:|:---:|
+| All modules | DIY, Banggood 4-in-1, iRangeX IRX4/IRX4+/IRX4Lite, Jumper 4in1 1st gen | Vantac lite, URUAV lite | Jumper T16 internal module |
+| <img src="images/ch340g.jpg" width="200"/> | <img src="images/4-pin-header.jpg" width="150" height="150"/> | <img src="images/4-pin-1mm.jpg" width="150" height="150"/> | <img src="images/5-pin-125mm.jpg" width="150" height="150"/> |
+| [(example ebay link)](https://www.ebay.co.uk/itm/FTDI-USB-to-TTL-Serial-Converter-Adapter-FT232RL-Module-5V-and-3-3V-Arduino-ARM/231918152528) | [(example ebay link)](https://www.ebay.co.uk/itm/4x-826629-4-Pin-header-pin-strips-AMPMODU-MOD-II-male-PIN4-straight/192334571714) | [(example ebay link)](https://www.ebay.com/itm/5-PCS-Mini-Micro-ZH-1mm-2-6-Pin-JST-Connector-with-Wire-HI/183963001322) | [(example ebay link)](https://www.ebay.co.uk/itm/5-PAIRS-5-PIN-Micro-JST-GH-1-25-Connector-Plug-Socket-1-25mm-150mm-Cable/273110735668)
 
 The USB-TTL adapter can be either FTDI or CH340G, as long as it works.  It should have a switch or jumper to select 3.3V or 5V, which **must** be set to **3.3V**.
 
-The 4-pin header needs to be soldered onto the board as indicated by the red rectangle:
+The header needs to be soldered onto the board as indicated by the red rectangle:
 
-| **DIY Multiprotocol** | **Banggood 4-in-1** | **iRangeX IRX4 Plus** | **Jumper** | **MPM Lite** |
-|:---:|:---:|:---:|:---:|:---:|
-| <img src="images/Board_PCB_STM32_with_serial.jpg" width="142" height="200"/> | <img src="images/bg-multi-stm32-serial.jpg" width="195" height="200"/> | <img src="images/irx4plus-serial.jpg" width="164" height="200"/> | <img src="images/Jumper-serial.jpg" width="164" height="200"/> | <img src="images/mpmlite-serial.jpg" width="200" height="189" />
+| **DIY Multiprotocol** | **Banggood 4-in-1** | **iRangeX IRX4 / IR4+** | **Jumper 4in1 1st gen** |
+|:---:|:---:|:---:|:---:|
+| <img src="images/Board_PCB_STM32_with_serial.jpg" width="142" height="200"/> | <img src="images/bg-multi-stm32-serial.jpg" width="195" height="200"/> | <img src="images/irx4plus-serial.jpg" width="164" height="200"/> | <img src="images/Jumper-serial.jpg" width="164" height="200"/> 
 
-**Note:** The Banggood STM32 module most likely already has the header pin in place.
+| **Vantac/URUAV Lite** | **iRangeX IRX4 Lite** | **Jumper T16 internal module** |
+|:---:|:---:|:---:|
+| <img src="images/mpmlite-serial.jpg" width="200" height="189" /> | <img src="images/irx4-lite.jpg" width="160" height="200" /> | <img src="images/T16-internal-connector.png" width="160" height="200" /> |
+
+**Note:** The Banggood STM32 and T16 internal modules most likely already has the header pin in place.
 
 ## Option 1 - Update Firmware using Precompiled Binaries
 If you don't need/want to customize the multi module firmware then you can use pre-compiled binaries available [here](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/releases).
@@ -135,21 +140,30 @@ The wiring for the USB-to-TTL adapter is:
 
 **It is critical to ensure that the USB-to-TTL adapter is set to 3.3V**.
 
-| **DIY Multiprotocol** | **Banggood 4-in-1** | **iRangeX IRX4** | **Jumper 4-in-1** |
-|:---:|:---:|:---:|:---:|
-| <img src="images/diy-ch340g.jpg" height="200"/> | <img src="images/bg-stm32-ch340g.jpg" height="200"/> | <img src="images/irx4-ch340g.jpg" height="200"/> | <img src="images/Jumper-ch340g.jpg" height="200"/> |
+| **DIY Multiprotocol** | **Banggood 4-in-1** | **iRangeX IRX4** |
+|:---:|:---:|:---:|
+| <img src="images/diy-ch340g.jpg" height="200"/> | <img src="images/bg-stm32-ch340g.jpg" height="200"/> | <img src="images/irx4-ch340g.jpg" height="200"/> |
+
+| **Jumper 4-in-1 1st gen** | **Jumper T16 internal module** |
+|:---:|:---:|
+| <img src="images/Jumper-ch340g.jpg" height="200"/> | <img src="images/T16-internal-connection.png" height="200"/> |
 
 1. Put the module in the transmitter
 1. Connect the USB-to-TTL adapter to the module as described above
 1. Plug the USB-to-TTL adapter into the PC
 1. In the Arduino IDE click **Tools -> Port** and choose the COM port which matches the USB-to-TTL adapter
 
-In order to flash the bootloader the **BOOT0** jumper must be installed connecting **BOOT0** to 3.3V.  The location of **BOOT0** varies by hardware module. The latest Jumper modules with an intergrated FTDI do not need the BOOT0 jumper.
+In order to flash the bootloader the **BOOT0** jumper must be installed connecting **BOOT0** to 3.3V.  The location of **BOOT0** varies by hardware module.
 
-| **DIY Multiprotocol** | **Banggood 4-in-1** | **iRangeX IRX4** | **iRangeX IRX4 Plus** | **Jumper 4-in-1** | **Vantac MPM Lite** |
-|:---:|:---:|:---:|:---:|:---:|:---:|
-| Bridge pins 1 and 2 as shown by the yellow jumper wire. | Bridge the left-most pins of the 6-pin header as shown by the yellow jumper. | Bridge pins 1 and 2 as shown by the blue jumper. | Bridge the BOOT0 pin to the adjacent 3.3V pin as shown by the yellow jumper. If it doesn't work move the jumper to bridge the two left hand pins (BOOT0 and directly above). | Bridge pins 1 and 2 as shown by the red jumper wire. | Brdige the two pins next to the usb port labelled with Boot0 |
-| <img src="images/diy-ch340g.jpg" height="200"/> | <img src="images/bg-stm32-boot0.jpg" height="200"/>  | <img src="images/irx4-boot0.jpg" height="200"/>  | <img src="images/irx4plus-boot0.jpg" height="200"/> | <img src="images/Jumper-ch340g.jpg" height="200"/> | <img src="images/mpmlite-boot0.jpg" width="200" /> |
+| **DIY Multiprotocol** | **Banggood 4-in-1** | **iRangeX IRX4** | **iRangeX IRX4 Plus** | **Jumper 4-in-1 1st gen** |
+|:---:|:---:|:---:|:---:|:---:|
+| Bridge pins 1 and 2 as shown by the yellow jumper wire. | Bridge the left-most pins of the 6-pin header as shown by the yellow jumper. | Bridge pins 1 and 2 as shown by the blue jumper. | Bridge the BOOT0 pin to the adjacent 3.3V pin as shown by the yellow jumper. If it doesn't work move the jumper to bridge the two left hand pins (BOOT0 and directly above). | Bridge pins 1 and 2 as shown by the red jumper wire. |
+| <img src="images/diy-ch340g.jpg" height="200"/> | <img src="images/bg-stm32-boot0.jpg" height="200"/>  | <img src="images/irx4-boot0.jpg" height="200"/>  | <img src="images/irx4plus-boot0.jpg" height="200"/> | <img src="images/Jumper-ch340g.jpg" height="200"/> |
+
+| **Vantac/URUAV Lite** | **iRangeX IRX4 Lite** | **Jumper T16 internal module** |
+|:---:|:---:|:---:|
+| Brdige the two pins next to the usb port labelled with Boot0 | Brdige the two indicated pins| Bridge BOOT0 and +3.3V in RED on the cabling |
+| <img src="images/mpmlite-boot0.jpg" width="200" /> | <img src="images/irx4-lite-boot0.jpg" height="200"/> | <img src="images/T16-internal-connection.png" height="200"/> |
 
 1. If on Linux, ensure you have permissions to access serial interfaces as described [here](https://github.com/benlye/DIY-Multiprotocol-TX-Module/blob/doc-updates/docs/Arduino_IDE_Boards.md#linux)
 1. Install the **BOOT0** jumper as described above.

docs/Frequency_Tuning.md

@@ -8,16 +8,17 @@ The protocols which require frequency tuning are:
 * **S-FHSS** (e.g. Futaba S-FHSS receivers)
 * **Corona** (e.g. Corona V1 FSS, Corona V2 DSSS CR8D/CR6D/CR4D and FlyDream IS-4R/IS-4R0 receivers)
 * **Hitec** (e.g. Optima, Minima, Micro and RED receivers)
+* **HoTT** (e.g. Graupner receivers)
 
 There is a [video](#video) at the end of this page which gives an example of the tuning process.
 
 ## More information
-Original FrSky, Futaba, Corona and Hitec receivers have been frequency-tuned by the manufacturer at the factory.  Because of variations in the oscillator crystals used in multiprotocol modules it is necessary to fine-tune the module to match the manufacturer frequencies.  
+Original FrSky, Futaba, Corona Hitec and HoTT receivers have been frequency-tuned by the manufacturer at the factory.  Because of variations in the oscillator crystals used in multiprotocol modules it is necessary to fine-tune the module to match the manufacturer frequencies.  
 
 'Compatible' receivers suffer the same variation in crystal oscillators as multiprotocol modules, but have to be compatible with genuine (manufacturer-tuned) transmitters so they will typically have auto-tuning built in, and will self-tune to the radio's frequency when they are bound.
 
 ## Fine-tuning procedure
-**Note:** For best results, the fine-tuning procedure should be carried out with a genuine FrSky/Futaba/Corona/Hitec receiver.
+**Note:** For best results, the fine-tuning procedure should be carried out with a genuine FrSky/Futaba/Corona/Hitec/HoTT receiver.
 
 The procedure can be performed in serial or PPM mode, but is easier with in serial mode where the effect of the change can be seen in real-time.
 
@@ -49,7 +50,7 @@ Connection is lost at -73 and +35; the median is -19:
 ### Finally
 Once the **Freq** value is known it should be applied to all other models which use this protocol and, if they were previously bound, the receivers must be re-bound.
 
-For convenience this can be done in the `_Config.h` (or `_MyConfig.h`) configuration file.
+For convenience this can be applied once for all per protocol using the FORCE commands described below in `_Config.h` (or `_MyConfig.h`) configuration file.
 
 #### Forced tuning values
 Once known-good tuning values have been determined, they can be stored in the configuration file to be automatically applied to all models which use the given protocol.
@@ -73,6 +74,7 @@ These settings can also be used to force different tuning values for different m
 //#define FORCE_SFHSS_TUNING  0
 //#define FORCE_CORONA_TUNING  0
 //#define FORCE_HITEC_TUNING  0
+//#define FORCE_HOTT_TUNING  0
 ```
 
 ## Video