From 51a01d139349d52eadd2291538380fb717f4ce1e Mon Sep 17 00:00:00 2001
From: pascallanger <pascal_langer@yahoo.fr>
Date: Tue, 14 Jul 2026 18:42:14 +0200
Subject: [PATCH] KF606 LED

Add LED channel for KF606 boards
---
 Lua_scripts/MultiChan.txt     |  2 +-
 Multiprotocol/KF606_ccnrf.ino | 37 ++++++++++++-----------------------
 Protocols_Details.md          | 21 ++++++++++++++------
 3 files changed, 28 insertions(+), 32 deletions(-)

diff --git a/Lua_scripts/MultiChan.txt b/Lua_scripts/MultiChan.txt
index bab4fae0..0134266b 100644
--- a/Lua_scripts/MultiChan.txt
+++ b/Lua_scripts/MultiChan.txt
@@ -119,7 +119,7 @@
 22,0,J6Pro,Std,0,CH5,CH6,CH7,CH8,CH9,CH10,CH11,CH12
 71,0,JJRC345,JJRC345,1,Flip,HLess,RTH,LED,UNK1,UNK2,UNK3
 71,1,JJRC345,SkyTmblr,1,Flip,HLess,RTH,LED,UNK1,UNK2,UNK3
-49,0,KF606,KF606,1,Trim
+49,0,KF606,KF606,1,Trim,LED
 49,1,KF606,MIG320,1,Trim,LED
 49,2,KF606,ZCZ50,1,Trim,UNK
 9,0,KN,WLToys,0,DRate,THold,IdleUp,Gyro,Ttrim,Atrim,Etrim,Rtrim,Hover
diff --git a/Multiprotocol/KF606_ccnrf.ino b/Multiprotocol/KF606_ccnrf.ino
index 516451a5..26e89c46 100644
--- a/Multiprotocol/KF606_ccnrf.ino
+++ b/Multiprotocol/KF606_ccnrf.ino
@@ -48,32 +48,19 @@ static void __attribute__((unused)) KF606_send_packet()
 		hopping_frequency_no ^= 1;			// 2 RF channels
 
 		packet[0] = 0x55;
-		packet[1] = convert_channel_8b(THROTTLE);					// 0..255
+		if(sub_protocol == KF606_ZCZ50) len--;
+		packet[len-3] = convert_channel_8b(THROTTLE);									// 0..255
 		// Deadband is needed on aileron, 40 gives +-6%
-		switch(sub_protocol)
-		{
-			case KF606_KF606:
-				packet[2] = convert_channel_8b_limit_deadband(AILERON,0x20,0x80,0xE0,40);	// Aileron: Max values:20..80..E0, Low rates:50..80..AF, High rates:3E..80..C1
-				packet[3] = convert_channel_16b_limit(CH5,0xC1,0xDF);						// Aileron trim must be on a separated channel C1..D0..DF
-				break;
-			case KF606_MIG320:
-				packet[2] = convert_channel_8b_limit_deadband(AILERON,0x00,0x80,0xFF,40);	// Aileron: High rate:2B..80..DA
-				packet[3] = convert_channel_16b_limit(CH5,0x01,0x1F);						// Aileron trim must be on a separated channel 01..10..1F
-				packet[3] += (packet[2]-0x80)>>3;											// Drive trims for more aileron authority
-				if(packet[3] > 0x80)
-					packet[3] = 0x01;
-				else if(packet[3] > 0x1F)
-					packet[3] = 0x1F;
-				packet[3] |= GET_FLAG(CH6_SW, 0xC0);										// 0xC0 and 0xE0 are both turning the LED off, not sure if there is another hidden feature
-				break;
-			case KF606_ZCZ50:
-				len--;																		// uses only 3 bytes of payload
-				packet[0] = packet[1];														// Throttle: 0x00..0xFF
-				packet[1] = convert_channel_8b_limit_deadband(AILERON,0x20,0x80,0xE0,40);	// Aileron: Max values:20..80..E0, low rate 0x52..0x80..0xB1, high rate: 0x41..0x80..0xC3.
-				packet[2] = convert_channel_16b_limit(CH5,0x01,0x1F);						// Trim: 0x01..0x10..0x1F
-				packet[2] |= GET_FLAG(CH6_SW, 0xC0);										// Unknown: 0x00 or 0xC0. Left top switch on original TX changes nothing on my plane. Maybe ON/OFF for main motor?
-				break;
-		}
+		packet[len-2] = convert_channel_8b_limit_deadband(AILERON,0x00,0x80,0xFF,40);	// Aileron: High rate:2B..80..DA
+		uint8_t p3;
+		p3 = convert_channel_8b(CH5)>>3;												// Aileron trim must be on a separated channel 01..10..1F
+		p3 += (packet[2]-0x80)>>3;														// Drive trims for more aileron authority
+		if(p3 > 0x80)
+			p3 = 0x01;
+		else if(p3 > 0x1F)
+			p3 = 0x1F;
+		p3 |= GET_FLAG(CH6_SW, 0xC0);													// 0xC0 and 0xE0 are both turning the LED off, not sure if there is another hidden feature
+		packet[len-1] = p3;
 	}
 
 	if(sub_protocol == KF606_MIG320)
diff --git a/Protocols_Details.md b/Protocols_Details.md
index 3248ff55..41befea3 100644
--- a/Protocols_Details.md
+++ b/Protocols_Details.md
@@ -99,7 +99,7 @@ CFlie|AIR|38|CFlie||||||||NRF24L01|
 [FrskyX2](Protocols_Details.md#FRSKYX2---64)||64|CH_16|CH_8|EU_16|EU_8|Cloned|Cloned_8|||CC2500|
 [Frsky_RX](Protocols_Details.md#FRSKY_RX---55)||55|Multi|CloneTX|EraseTX|CPPM|||||CC2500|
 [Futaba/SFHSS](Protocols_Details.md#Futaba---21)||21|SFHSS||||||||CC2500|
-[FX](Protocols_Details.md#FX---58)||28|816|620|9630|Q560|QF012||||NRF24L01|
+[FX](Protocols_Details.md#FX---58)||28|FX816|FX620|9630|Q560|QF012|FX818|||NRF24L01|
 [FY326](Protocols_Details.md#FY326---20)||20|FY326|FY319|||||||NRF24L01|
 [GD00X](Protocols_Details.md#GD00X---47)||47|GD_V1*|GD_V2*|||||||NRF24L01|XN297L
 [GW008](Protocols_Details.md#GW008---32)||32|||||||||NRF24L01|XN297
@@ -1144,9 +1144,9 @@ New generation of GD models
 ### Sub_protocol KF606 - *0*
 Model: KF606
 
-CH1|CH2|CH3|CH4|CH5
----|---|---|---|---
-A||T||TRIM
+CH1|CH2|CH3|CH4|CH5|CH6
+---|---|---|---|---|---
+A||T||TRIM|LED
 
 ### Sub_protocol MIG320 - *1*
 Model: Zhiyang MIG-320
@@ -1839,7 +1839,7 @@ FMODE and AUX7 have 4 positions: -100%..-50%=>0, -50%..5%=>1, 5%..50%=>2, 50%..1
 ## FX - *58*
 FEI XIONG
 
-### Sub_protocol 816 - *0*
+### Sub_protocol FX816 - *0*
 Model: FX816 P38, B17
 
 Only 8 TX IDs available
@@ -1848,7 +1848,7 @@ CH1|CH2|CH3|CH4
 ---|---|---|---
 A|-|T|-
 
-### Sub_protocol 620 - *1*
+### Sub_protocol FX620 - *1*
 Model: FX620 SU35
 
 CH1|CH2|CH3|CH4
@@ -1890,6 +1890,15 @@ Gyro: -100%=6G, 0%=3D+Gyro, +100%=3D
 
 Reset: Restore fine tunning midpoint
 
+### Sub_protocol FX818 - *5*
+Model: FX818/FX820/FX822/FX823
+
+Telemetry supported. The plane sends a battery status of good->empty which is visible in A1 (good=4.2V->empty=3.1V) and RSSI gets a dummy value of 100.
+
+CH1|CH2|CH3|CH4
+---|---|---|---
+A|-|T|-
+
 ## FY326 - *20*
 
 ### Sub_protocol FY326 - *0*