mirror of
https://github.com/pascallanger/DIY-Multiprotocol-TX-Module.git
synced 2025-02-04 18:58:13 +00:00
361 lines
11 KiB
C++
361 lines
11 KiB
C++
/*
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This project is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Multiprotocol is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Multiprotocol. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if defined(FRSKY_RX_CC2500_INO)
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#include "iface_cc2500.h"
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#define FRSKY_RX_D16FCC_LENGTH 32
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#define FRSKY_RX_D16LBT_LENGTH 35
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#define FRSKY_RX_D8_LENGTH 20
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enum {
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FRSKY_RX_TUNE_START,
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FRSKY_RX_TUNE_LOW,
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FRSKY_RX_TUNE_HIGH,
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FRSKY_RX_BIND,
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FRSKY_RX_DATA,
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};
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static uint8_t frsky_rx_chanskip;
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static int8_t frsky_rx_finetune;
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static void __attribute__((unused)) frsky_rx_strobe_rx()
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{
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CC2500_Strobe(CC2500_SIDLE);
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CC2500_Strobe(CC2500_SFRX);
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CC2500_Strobe(CC2500_SRX);
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}
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static void __attribute__((unused)) frsky_rx_initialise() {
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CC2500_Reset();
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CC2500_Strobe(CC2500_SIDLE);
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CC2500_WriteReg(CC2500_0A_CHANNR, 0); // bind channel
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switch (sub_protocol) {
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case FRSKY_RX_D16FCC:
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FRSKY_init_cc2500(FRSKYX_cc2500_conf);
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break;
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case FRSKY_RX_D16LBT:
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FRSKY_init_cc2500(FRSKYXEU_cc2500_conf);
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break;
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case FRSKY_RX_D8:
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FRSKY_init_cc2500(FRSKYD_cc2500_conf);
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CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // always check address
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CC2500_WriteReg(CC2500_09_ADDR, 0x03); // bind address
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CC2500_WriteReg(CC2500_23_FSCAL3, 0x89); // fixed FSCAL3 ?
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break;
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}
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rx_disable_lna = IS_POWER_FLAG_on;
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CC2500_SetTxRxMode(rx_disable_lna ? TXRX_OFF : RX_EN); // lna disable / enable
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frsky_rx_strobe_rx();
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delayMicroseconds(1000); // wait for RX to activate
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}
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static void __attribute__((unused)) frsky_rx_set_channel(uint8_t channel)
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{
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CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[channel]);
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if(sub_protocol == FRSKY_RX_D8)
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CC2500_WriteReg(CC2500_23_FSCAL3, 0x89);
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else
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CC2500_WriteReg(CC2500_25_FSCAL1, calData[channel]);
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frsky_rx_strobe_rx();
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}
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static void __attribute__((unused)) frsky_rx_calibrate()
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{
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frsky_rx_strobe_rx();
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for (unsigned c = 0; c < 47; c++)
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{
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CC2500_Strobe(CC2500_SIDLE);
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CC2500_WriteReg(CC2500_0A_CHANNR, hopping_frequency[c]);
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CC2500_Strobe(CC2500_SCAL);
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delayMicroseconds(900);
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calData[c] = CC2500_ReadReg(CC2500_25_FSCAL1);
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}
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}
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static uint8_t __attribute__((unused)) frskyx_rx_check_crc()
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{
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if (sub_protocol == FRSKY_RX_D8)
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return 1;
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uint8_t limit = packet_length - 4;
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uint16_t lcrc = FrSkyX_crc(&packet[3], limit - 3); // computed crc
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uint16_t rcrc = (packet[limit] << 8) | (packet[limit + 1] & 0xff); // received crc
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return lcrc == rcrc;
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}
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static void __attribute__((unused)) frsky_rx_build_telemetry_packet()
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{
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uint16_t raw_channel[8];
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uint32_t bits = 0;
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uint8_t bitsavailable = 0;
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uint8_t idx = 0;
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uint8_t i;
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if (sub_protocol == FRSKY_RX_D16FCC || sub_protocol == FRSKY_RX_D16LBT) {
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// decode D16 channels
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raw_channel[0] = ((packet[10] << 8) & 0xF00) | packet[9];
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raw_channel[1] = ((packet[11] << 4) & 0xFF0) | (packet[10] >> 4);
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raw_channel[2] = ((packet[13] << 8) & 0xF00) | packet[12];
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raw_channel[3] = ((packet[14] << 4) & 0xFF0) | (packet[13] >> 4);
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raw_channel[4] = ((packet[16] << 8) & 0xF00) | packet[15];
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raw_channel[5] = ((packet[17] << 4) & 0xFF0) | (packet[16] >> 4);
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raw_channel[6] = ((packet[19] << 8) & 0xF00) | packet[18];
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raw_channel[7] = ((packet[20] << 4) & 0xFF0) | (packet[19] >> 4);
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for (i = 0; i < 8; i++) {
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uint8_t shifted = (raw_channel[i] & 0x800)>0;
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uint16_t channel_value = raw_channel[i] & 0x7FF;
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if (channel_value < 64)
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rx_rc_chan[shifted ? i + 8 : i] = 0;
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else
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rx_rc_chan[shifted ? i + 8 : i] = min(((channel_value - 64) << 4) / 15, 2047);
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}
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}
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else {
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// decode D8 channels
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raw_channel[0] = ((packet[10] & 0x0F) << 8 | packet[6]);
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raw_channel[1] = ((packet[10] & 0xF0) << 4 | packet[7]);
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raw_channel[2] = ((packet[11] & 0x0F) << 8 | packet[8]);
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raw_channel[3] = ((packet[11] & 0xF0) << 4 | packet[9]);
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raw_channel[4] = ((packet[16] & 0x0F) << 8 | packet[12]);
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raw_channel[5] = ((packet[16] & 0xF0) << 4 | packet[13]);
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raw_channel[6] = ((packet[17] & 0x0F) << 8 | packet[14]);
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raw_channel[7] = ((packet[17] & 0xF0) << 4 | packet[15]);
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for (i = 0; i < 8; i++) {
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if (raw_channel[i] < 1290)
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raw_channel[i] = 1290;
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rx_rc_chan[i] = min(((raw_channel[i] - 1290) << 4) / 15, 2047);
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}
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}
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// buid telemetry packet
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packet_in[idx++] = RX_LQI;
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packet_in[idx++] = RX_RSSI;
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packet_in[idx++] = 0; // start channel
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packet_in[idx++] = sub_protocol == FRSKY_RX_D8 ? 8 : 16; // number of channels in packet
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// pack channels
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for (i = 0; i < packet_in[3]; i++) {
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bits |= ((uint32_t)rx_rc_chan[i]) << bitsavailable;
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bitsavailable += 11;
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while (bitsavailable >= 8) {
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packet_in[idx++] = bits & 0xff;
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bits >>= 8;
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bitsavailable -= 8;
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}
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}
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}
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uint16_t initFrSky_Rx()
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{
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const uint8_t frsky_rx_length[] = {FRSKY_RX_D16FCC_LENGTH, FRSKY_RX_D16LBT_LENGTH, FRSKY_RX_D8_LENGTH};
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packet_length = frsky_rx_length[sub_protocol];
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frsky_rx_initialise();
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state = 0;
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frsky_rx_chanskip = 1;
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hopping_frequency_no = 0;
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rx_data_started = 0;
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frsky_rx_finetune = 0;
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telemetry_link = 0;
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if (IS_BIND_IN_PROGRESS) {
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phase = FRSKY_RX_TUNE_START;
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}
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else {
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uint16_t temp = FRSKY_RX_EEPROM_OFFSET;
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rx_tx_addr[0] = eeprom_read_byte((EE_ADDR)temp++);
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rx_tx_addr[1] = eeprom_read_byte((EE_ADDR)temp++);
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rx_tx_addr[2] = eeprom_read_byte((EE_ADDR)temp++);
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frsky_rx_finetune = eeprom_read_byte((EE_ADDR)temp++);
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for (uint8_t ch = 0; ch < 47; ch++)
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hopping_frequency[ch] = eeprom_read_byte((EE_ADDR)temp++);
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if (sub_protocol == FRSKY_RX_D16FCC || sub_protocol == FRSKY_RX_D16LBT) {
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frsky_rx_calibrate();
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CC2500_WriteReg(CC2500_18_MCSM0, 0x08); // FS_AUTOCAL = manual
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}
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CC2500_WriteReg(CC2500_09_ADDR, rx_tx_addr[0]); // set address
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CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // check address
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if (option == 0)
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CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
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else
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CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
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frsky_rx_set_channel(hopping_frequency_no);
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phase = FRSKY_RX_DATA;
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}
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return 1000;
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}
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uint16_t FrSky_Rx_callback()
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{
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static uint32_t pps_timer=0;
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static uint8_t pps_counter=0;
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static int8_t read_retry = 0;
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static int8_t tune_low, tune_high;
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uint8_t len, ch;
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if ((prev_option != option) && (phase >= FRSKY_RX_DATA)) {
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if (option == 0)
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CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
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else
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CC2500_WriteReg(CC2500_0C_FSCTRL0, option);
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prev_option = option;
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}
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if (rx_disable_lna != IS_POWER_FLAG_on) {
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rx_disable_lna = IS_POWER_FLAG_on;
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CC2500_SetTxRxMode(rx_disable_lna ? TXRX_OFF : RX_EN);
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}
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len = CC2500_ReadReg(CC2500_3B_RXBYTES | CC2500_READ_BURST) & 0x7F;
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switch(phase) {
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case FRSKY_RX_TUNE_START:
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if (len >= packet_length) {
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CC2500_ReadData(packet, packet_length);
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if(packet[1] == 0x03 && packet[2] == 0x01) {
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if(frskyx_rx_check_crc()) {
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frsky_rx_finetune = -127;
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CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
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phase = FRSKY_RX_TUNE_LOW;
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frsky_rx_strobe_rx();
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return 1000;
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}
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}
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}
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frsky_rx_finetune += 10;
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CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
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frsky_rx_strobe_rx();
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return 18000;
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case FRSKY_RX_TUNE_LOW:
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if (len >= packet_length) {
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CC2500_ReadData(packet, packet_length);
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if (frskyx_rx_check_crc()) {
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tune_low = frsky_rx_finetune;
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frsky_rx_finetune = 127;
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CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
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phase = FRSKY_RX_TUNE_HIGH;
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frsky_rx_strobe_rx();
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return 1000;
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}
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}
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frsky_rx_finetune += 1;
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CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
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frsky_rx_strobe_rx();
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return 18000;
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case FRSKY_RX_TUNE_HIGH:
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if (len >= packet_length) {
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CC2500_ReadData(packet, packet_length);
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if (frskyx_rx_check_crc()) {
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tune_high = frsky_rx_finetune;
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frsky_rx_finetune = (tune_low + tune_high) / 2;
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CC2500_WriteReg(CC2500_0C_FSCTRL0, (int8_t)frsky_rx_finetune);
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if(tune_low < tune_high)
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phase = FRSKY_RX_BIND;
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else
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phase = FRSKY_RX_TUNE_START;
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frsky_rx_strobe_rx();
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return 1000;
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}
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}
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frsky_rx_finetune -= 1;
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CC2500_WriteReg(CC2500_0C_FSCTRL0, frsky_rx_finetune);
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frsky_rx_strobe_rx();
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return 18000;
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case FRSKY_RX_BIND:
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if(len >= packet_length) {
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CC2500_ReadData(packet, packet_length);
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if (frskyx_rx_check_crc()) {
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if (packet[5] <= 0x2D) {
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for (ch = 0; ch < 5; ch++)
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hopping_frequency[packet[5]+ch] = packet[6+ch];
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state |= 1 << (packet[5] / 5);
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}
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}
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if (state == 0x3ff) {
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debugln("bind complete");
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frsky_rx_calibrate();
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rx_tx_addr[0] = packet[3]; // TXID
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rx_tx_addr[1] = packet[4]; // TXID
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rx_tx_addr[2] = packet[12]; // RX # (D16)
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if (sub_protocol == FRSKY_RX_D16FCC || sub_protocol == FRSKY_RX_D16LBT)
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CC2500_WriteReg(CC2500_18_MCSM0, 0x08); // FS_AUTOCAL = manual
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CC2500_WriteReg(CC2500_09_ADDR, rx_tx_addr[0]); // set address
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CC2500_WriteReg(CC2500_07_PKTCTRL1, 0x05); // check address
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phase = FRSKY_RX_DATA;
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frsky_rx_set_channel(hopping_frequency_no);
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// store txid and channel list
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uint16_t temp = FRSKY_RX_EEPROM_OFFSET;
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eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[0]);
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eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[1]);
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eeprom_write_byte((EE_ADDR)temp++, rx_tx_addr[2]);
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eeprom_write_byte((EE_ADDR)temp++, frsky_rx_finetune);
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for (ch = 0; ch < 47; ch++)
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eeprom_write_byte((EE_ADDR)temp++, hopping_frequency[ch]);
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BIND_DONE;
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}
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frsky_rx_strobe_rx();
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}
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return 1000;
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case FRSKY_RX_DATA:
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if (len >= packet_length) {
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CC2500_ReadData(packet, packet_length);
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if (packet[1] == rx_tx_addr[0] && packet[2] == rx_tx_addr[1] && frskyx_rx_check_crc() && (sub_protocol == FRSKY_RX_D8 || packet[6] == rx_tx_addr[2])) {
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RX_RSSI = packet[packet_length-2];
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if(RX_RSSI >= 128)
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RX_RSSI -= 128;
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else
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RX_RSSI += 128;
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// hop to next channel
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if (sub_protocol == FRSKY_RX_D16FCC || sub_protocol == FRSKY_RX_D16LBT)
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frsky_rx_chanskip = ((packet[4] & 0xC0) >> 6) | ((packet[5] & 0x3F) << 2);
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hopping_frequency_no = (hopping_frequency_no + frsky_rx_chanskip) % 47;
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frsky_rx_set_channel(hopping_frequency_no);
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if((sub_protocol == FRSKY_RX_D8 || packet[7] == 0) && telemetry_link == 0) { // send channels to TX
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frsky_rx_build_telemetry_packet();
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telemetry_link = 1;
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}
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rx_data_started = 1;
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read_retry = 0;
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pps_counter++;
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}
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}
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// packets per second
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if (millis() - pps_timer >= 1000) {
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pps_timer = millis();
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debugln("%d pps", pps_counter);
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RX_LQI = pps_counter;
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pps_counter = 0;
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}
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// skip channel if no packet received in time
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if (read_retry++ >= 9) {
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hopping_frequency_no = (hopping_frequency_no + frsky_rx_chanskip) % 47;
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frsky_rx_set_channel(hopping_frequency_no);
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if(rx_data_started)
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read_retry = 0;
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else
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read_retry = -50; // retry longer until first packet is catched
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}
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break;
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}
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return 1000;
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}
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#endif
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