/* 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/>. */ //************************** // Telemetry serial code * //************************** #if defined TELEMETRY #if defined MULTI_TELEMETRY #define MULTI_TIME 250 //in ms uint32_t lastMulti = 0; #endif #if defined SPORT_TELEMETRY #define SPORT_TIME 12000 //12ms #define FRSKY_SPORT_PACKET_SIZE 8 uint32_t last = 0; uint8_t sport_counter=0; uint8_t RxBt = 0; uint8_t rssi; uint8_t sport = 0; #endif #if defined HUB_TELEMETRY #define USER_MAX_BYTES 6 uint8_t prev_index; #endif #define START_STOP 0x7e #define BYTESTUFF 0x7d #define STUFF_MASK 0x20 #define MAX_PKTX 10 uint8_t pktx[MAX_PKTX]; uint8_t pktx1[MAX_PKTX]; uint8_t indx; uint8_t frame[18]; #ifdef BASH_SERIAL // For bit-bashed serial output volatile struct t_serial_bash { uint8_t head ; uint8_t tail ; uint8_t data[64] ; uint8_t busy ; uint8_t speed ; } SerialControl ; #endif #ifdef MULTI_TELEMETRY static void multi_send_header(uint8_t type, uint8_t len) { Serial_write('M'); Serial_write('P'); Serial_write(type); Serial_write(len); } static void multi_send_frskyhub() { multi_send_header(MULTI_TELEMETRY_HUB, 9); for (uint8_t i = 0; i < 9; i++) Serial_write(frame[i]); } static void multi_send_status() { multi_send_header(MULTI_TELEMETRY_STATUS, 5); // Build flags uint8_t flags=0; if (IS_INPUT_SIGNAL_on) flags |= 0x01; if (mode_select==MODE_SERIAL) flags |= 0x02; if (remote_callback != 0) flags |= 0x04; if (!IS_BIND_DONE_on) flags |= 0x08; Serial_write(flags); // Version number example: 1.1.6.1 Serial_write(VERSION_MAJOR); Serial_write(VERSION_MINOR); Serial_write(VERSION_REVISION); Serial_write(VERSION_PATCH_LEVEL); } #endif #ifdef DSM_TELEMETRY #ifdef MULTI_TELEMETRY void DSM_frame() { if (pkt[0] == 0x80) { multi_send_header(MULTI_TELEMETRY_DSMBIND, 10); for (uint8_t i = 1; i < 11; i++) // 10 bytes of DSM bind response Serial_write(pkt[i]); } else { multi_send_header(MULTI_TELEMETRY_DSM, 17); for (uint8_t i = 0; i < 17; i++) // RSSI value followed by 16 bytes of telemetry data Serial_write(pkt[i]); } } #else void DSM_frame() { Serial_write(0xAA); // Telemetry packet for (uint8_t i = 0; i < 17; i++) // RSSI value followed by 16 bytes of telemetry data Serial_write(pkt[i]); } #endif #endif #ifdef AFHDS2A_FW_TELEMETRY void AFHDSA_short_frame() { #if defined MULTI_TELEMETRY multi_send_header(MULTI_TELEMETRY_AFHDS2A, 29); #else Serial_write(0xAA); // Telemetry packet #endif for (uint8_t i = 0; i < 29; i++) // RSSI value followed by 4*7 bytes of telemetry data Serial_write(pkt[i]); } #endif void frskySendStuffed() { Serial_write(START_STOP); for (uint8_t i = 0; i < 9; i++) { if ((frame[i] == START_STOP) || (frame[i] == BYTESTUFF)) { Serial_write(BYTESTUFF); frame[i] ^= STUFF_MASK; } Serial_write(frame[i]); } Serial_write(START_STOP); } void compute_RSSIdbm() { RSSI_dBm = (((uint16_t)(pktt[len-2])*18)>>4); if(pktt[len-2] >=128) RSSI_dBm -= 164; else RSSI_dBm += 130; } void frsky_check_telemetry(uint8_t *pkt,uint8_t len) { if(pkt[1] == rx_tx_addr[3] && pkt[2] == rx_tx_addr[2] && len ==(pkt[0] + 3)) { for (uint8_t i=3;i<len;i++) pktt[i]=pkt[i]; telemetry_link=1; if(pktt[6]) telemetry_counter=(telemetry_counter+1)%32; // #if defined SPORT_TELEMETRY && defined FRSKYX_CC2500_INO telemetry_lost=0; if (protocol==MODE_FRSKYX) { if ((pktt[5] >> 4 & 0x0f) == 0x08) { seq_last_sent = 8; seq_last_rcvd = 0; pass=0; } else { if ((pktt[5] >> 4 & 0x03) == (seq_last_rcvd + 1) % 4) seq_last_rcvd = (seq_last_rcvd + 1) % 4; else pass=0;//reset if sequence wrong } } #endif } } void init_hub_telemetry() { telemetry_link=0; telemetry_counter=0; v_lipo1=0; v_lipo2=0; RSSI_dBm=0; TX_RSSI=0; } void frsky_link_frame() { frame[0] = 0xFE; if (protocol==MODE_FRSKYD) { compute_RSSIdbm(); frame[1] = pktt[3]; frame[2] = pktt[4]; frame[3] = pktt[5]; frame[4] = (uint8_t)RSSI_dBm; } else if (protocol==MODE_HUBSAN||protocol==MODE_AFHDS2A||protocol==MODE_BAYANG) { frame[1] = v_lipo1; frame[2] = v_lipo2; frame[3] = (uint8_t)RSSI_dBm; frame[4] = TX_RSSI; } frame[5] = frame[6] = frame[7] = frame[8] = 0; #if defined MULTI_TELEMETRY multi_send_frskyhub(); #else frskySendStuffed(); #endif } #if defined HUB_TELEMETRY void frsky_user_frame() { uint8_t indexx = 0, j=8, i; //uint8_t c=0, n=0; if(pktt[6]>0 && pktt[6]<=10) {//only valid hub frames frame[0] = 0xFD; frame[2] = pktt[7]; switch(pass) { case 0: indexx=pktt[6]; for(i=0;i<indexx;i++) { // if(pktt[j]==0x5E) // { // if(c++) // { // c=0; // n++; // j++; // } // } pktx[i]=pktt[j++]; } // indexx = indexx-n; pass=1; case 1: indx=indexx; prev_index = indexx; if(indx<USER_MAX_BYTES) { for(i=0;i<indx;i++) frame[i+3]=pktx[i]; pktt[6]=0; pass=0; } else { indx = USER_MAX_BYTES; for(i=0;i<indx;i++) frame[i+3]=pktx[i]; pass=2; } break; case 2: indx = prev_index - indx; prev_index=0; if(indx<=(MAX_PKTX-USER_MAX_BYTES)) //10-6=4 for(i=0;i<indx;i++) frame[i+3]=pktx[USER_MAX_BYTES+i]; pass=0; pktt[6]=0; break; default: break; } if(!indx) return; frame[1] = indx; #if defined MULTI_TELEMETRY multi_send_frskyhub(); #else frskySendStuffed(); #endif } else pass=0; } #endif /* HuB RX packets. pkt[6]|(counter++)|00 01 02 03 04 05 06 07 08 09 %32 01 08 5E 28 12 00 5E 5E 3A 06 00 5E 0A 09 28 12 00 5E 5E 3A 06 00 5E 5E 09 0A 3B 09 00 5E 5E 06 36 7D 5E 5E 03 0B 5E 28 11 00 5E 5E 06 06 6C 5E 0A 0C 00 5E 5E 3A 06 00 5E 5E 3B 09 07 0D 00 5E 5E 06 06 6C 5E 16 72 5E 05 0E 5E 28 11 00 5E 5E 3A 06 00 5E 0A 0F 5E 3A 06 00 5E 5E 3B 09 00 5E 05 10 5E 06 16 72 5E 5E 3A 06 00 5E */ #if defined SPORT_TELEMETRY /* SPORT details serial 100K 8E2 normal-multiprotocol -every 12ms-or multiple of 12; %36 1 2 3 4 5 6 7 8 9 CRC DESCR 7E 98 10 05 F1 20 23 0F 00 A6 SWR_ID 7E 98 10 01 F1 33 00 00 00 C9 RSSI_ID 7E 98 10 04 F1 58 00 00 00 A1 BATT_ID 7E BA 10 03 F1 E2 00 00 00 18 ADC2_ID 7E BA 10 03 F1 E2 00 00 00 18 ADC2_ID 7E BA 10 03 F1 E2 00 00 00 18 ADC2_ID 7E BA 10 03 F1 E2 00 00 00 18 ADC2_ID 7E BA 10 03 F1 E2 00 00 00 18 ADC2_ID 7E BA 10 03 F1 E2 00 00 00 18 ADC2_ID Telemetry frames(RF) SPORT info 15 bytes payload SPORT frame valid 6+3 bytes [00] PKLEN 0E 0E 0E 0E [01] TXID1 DD DD DD DD [02] TXID2 6D 6D 6D 6D [03] CONST 02 02 02 02 [04] RS/RB 2C D0 2C CE //D0;CE=2*RSSI;....2C = RX battery voltage(5V from Bec) [05] HD-SK 03 10 21 32 //TX/RX telemetry hand-shake bytes [06] NO.BT 00 00 06 03 //No.of valid SPORT frame bytes in the frame [07] STRM1 00 00 7E 00 [08] STRM2 00 00 1A 00 [09] STRM3 00 00 10 00 [10] STRM4 03 03 03 03 [11] STRM5 F1 F1 F1 F1 [12] STRM6 D1 D1 D0 D0 [13] CHKSUM1 --|2 CRC bytes sent by RX (calculated on RX side crc16/table) [14] CHKSUM2 --| +2 appended bytes automatically RSSI and LQI/CRC bytes(len=0x0E+3); 0x06 0x06 0x06 0x06 0x06 0x7E 0x00 0x03 0x7E 0x00 0x1A 0x00 0xF1 0x1A 0x00 0x10 0x00 0xD7 0x10 0x00 0x03 0x7E 0x00 0x03 0x7E 0xF1 0x1A 0x00 0xF1 0x1A 0xD7 0x10 0x00 0xD7 0x10 0xE1 0x1C 0xD0 0xEE 0x33 0x34 0x0A 0xC3 0x56 0xF3 */ #ifdef MULTI_TELEMETRY void sportSend(uint8_t *p) { multi_send_header(MULTI_TELEMETRY_SPORT, 9); uint16_t crc_s = 0; Serial_write(p[0]) ; for (uint8_t i = 1; i < 9; i++) { if (i == 8) p[i] = 0xff - crc_s; Serial_write(p[i]); if (i>0) { crc_s += p[i]; //0-1FF crc_s += crc_s >> 8; //0-100 crc_s &= 0x00ff; } } } #else void sportSend(uint8_t *p) { uint16_t crc_s = 0; Serial_write(START_STOP);//+9 Serial_write(p[0]) ; for (uint8_t i = 1; i < 9; i++) { if (i == 8) p[i] = 0xff - crc_s; if ((p[i] == START_STOP) || (p[i] == BYTESTUFF)) { Serial_write(BYTESTUFF);//stuff again Serial_write(STUFF_MASK ^ p[i]); } else Serial_write(p[i]); if (i>0) { crc_s += p[i]; //0-1FF crc_s += crc_s >> 8; //0-100 crc_s &= 0x00ff; } } } #endif void sportIdle() { #if !defined MULTI_TELEMETRY Serial_write(START_STOP); #endif } void sportSendFrame() { uint8_t i; sport_counter = (sport_counter + 1) %36; if(telemetry_lost) { sportIdle(); return; } if(sport_counter<6) { frame[0] = 0x98; frame[1] = 0x10; for (i=5;i<8;i++) frame[i]=0; } switch (sport_counter) { case 0: frame[2] = 0x05; frame[3] = 0xf1; frame[4] = 0x02 ;//dummy values if swr 20230f00 frame[5] = 0x23; frame[6] = 0x0F; break; case 2: // RSSI frame[2] = 0x01; frame[3] = 0xf1; frame[4] = rssi; break; case 4: //BATT frame[2] = 0x04; frame[3] = 0xf1; frame[4] = RxBt;//a1; break; default: if(sport) { for (i=0;i<FRSKY_SPORT_PACKET_SIZE;i++) frame[i]=pktx1[i]; sport=0; break; } else { sportIdle(); return; } } sportSend(frame); } void proces_sport_data(uint8_t data) { switch (pass) { case 0: if (data == START_STOP) {//waiting for 0x7e indx = 0; pass = 1; } break; case 1: if (data == START_STOP) // Happens if missed packet {//waiting for 0x7e indx = 0; pass = 1; break; } if(data == BYTESTUFF)//if they are stuffed pass=2; else if (indx < MAX_PKTX) pktx[indx++] = data; break; case 2: if (indx < MAX_PKTX) pktx[indx++] = data ^ STUFF_MASK; //unstuff bytes pass=1; break; } // end switch if (indx >= FRSKY_SPORT_PACKET_SIZE) {//8 bytes no crc if ( sport ) { // overrun! } else { uint8_t i ; for ( i = 0 ; i < FRSKY_SPORT_PACKET_SIZE ; i += 1 ) { pktx1[i] = pktx[i] ; // Double buffer } sport = 1;//ok to send } pass = 0;//reset } } #endif void TelemetryUpdate() { // check for space in tx buffer #ifdef BASH_SERIAL uint8_t h ; uint8_t t ; h = SerialControl.head ; t = SerialControl.tail ; if ( h >= t ) { t += 64 - h ; } else { t -= h ; } if ( t < 32 ) { return ; } #else uint8_t h ; uint8_t t ; h = tx_head ; t = tx_tail ; if ( h >= t ) { t += TXBUFFER_SIZE - h ; } else { t -= h ; } if ( t < 16 ) { return ; } #endif #if defined MULTI_TELEMETRY { uint32_t now = millis(); if ((now - lastMulti) > MULTI_TIME) { multi_send_status(); lastMulti = now; return; } } #endif #if defined SPORT_TELEMETRY if (protocol==MODE_FRSKYX) { // FrSkyX if(telemetry_link) { if(pktt[4] & 0x80) rssi=pktt[4] & 0x7F ; else RxBt = (pktt[4]<<1) + 1 ; if(pktt[6]<=6) for (uint8_t i=0; i < pktt[6]; i++) proces_sport_data(pktt[7+i]); telemetry_link=0; } uint32_t now = micros(); if ((now - last) > SPORT_TIME) { sportSendFrame(); #ifdef STM32_BOARD last=now; #else last += SPORT_TIME ; #endif } } #endif #if defined DSM_TELEMETRY if(telemetry_link && protocol == MODE_DSM ) { // DSM DSM_frame(); telemetry_link=0; return; } #endif #if defined AFHDS2A_FW_TELEMETRY if(telemetry_link == 2 && protocol == MODE_AFHDS2A) { AFHDSA_short_frame(); telemetry_link=0; } #endif if(telemetry_link && protocol != MODE_FRSKYX ) { // FrSkyD + Hubsan + AFHDS2A + Bayang frsky_link_frame(); telemetry_link=0; return; } #if defined HUB_TELEMETRY if(!telemetry_link && protocol == MODE_FRSKYD) { // FrSky frsky_user_frame(); return; } #endif } /**************************/ /**************************/ /** Serial TX routines **/ /**************************/ /**************************/ #ifndef BASH_SERIAL // Routines for normal serial output void Serial_write(uint8_t data) { uint8_t nextHead ; nextHead = tx_head + 1 ; if ( nextHead >= TXBUFFER_SIZE ) nextHead = 0 ; tx_buff[nextHead]=data; tx_head = nextHead ; tx_resume(); } void initTXSerial( uint8_t speed) { #ifdef ENABLE_PPM if(speed==SPEED_9600) { // 9600 #ifdef ORANGE_TX USARTC0.BAUDCTRLA = 207 ; USARTC0.BAUDCTRLB = 0 ; USARTC0.CTRLB = 0x18 ; USARTC0.CTRLA = (USARTC0.CTRLA & 0xCF) | 0x10 ; USARTC0.CTRLC = 0x03 ; #else #ifdef STM32_BOARD usart3_begin(9600,SERIAL_8N1); //USART3 USART3_BASE->CR1 &= ~ USART_CR1_RE; //disable RX leave TX enabled #else UBRR0H = 0x00; UBRR0L = 0x67; UCSR0A = 0 ; // Clear X2 bit //Set frame format to 8 data bits, none, 1 stop bit UCSR0C = (1<<UCSZ01)|(1<<UCSZ00); #endif #endif } else if(speed==SPEED_57600) { // 57600 #ifdef ORANGE_TX /*USARTC0.BAUDCTRLA = 207 ; USARTC0.BAUDCTRLB = 0 ; USARTC0.CTRLB = 0x18 ; USARTC0.CTRLA = (USARTC0.CTRLA & 0xCF) | 0x10 ; USARTC0.CTRLC = 0x03 ;*/ #else #ifdef STM32_BOARD usart3_begin(57600,SERIAL_8N1); //USART3 USART3_BASE->CR1 &= ~ USART_CR1_RE; //disable RX leave TX enabled #else UBRR0H = 0x00; UBRR0L = 0x22; UCSR0A = 0x02 ; // Set X2 bit //Set frame format to 8 data bits, none, 1 stop bit UCSR0C = (1<<UCSZ01)|(1<<UCSZ00); #endif #endif } else if(speed==SPEED_125K) { // 125000 #ifdef ORANGE_TX /*USARTC0.BAUDCTRLA = 207 ; USARTC0.BAUDCTRLB = 0 ; USARTC0.CTRLB = 0x18 ; USARTC0.CTRLA = (USARTC0.CTRLA & 0xCF) | 0x10 ; USARTC0.CTRLC = 0x03 ;*/ #else #ifdef STM32_BOARD usart3_begin(125000,SERIAL_8N1); //USART3 USART3_BASE->CR1 &= ~ USART_CR1_RE; //disable RX leave TX enabled #else UBRR0H = 0x00; UBRR0L = 0x07; UCSR0A = 0x00 ; // Clear X2 bit //Set frame format to 8 data bits, none, 1 stop bit UCSR0C = (1<<UCSZ01)|(1<<UCSZ00); #endif #endif } #endif #ifndef ORANGE_TX #ifndef STM32_BOARD UCSR0B |= (1<<TXEN0);//tx enable #endif #endif } //Serial TX #ifdef ORANGE_TX ISR(USARTC0_DRE_vect) #else #ifdef STM32_BOARD void __irq_usart3() #else ISR(USART_UDRE_vect) #endif #endif { // Transmit interrupt #ifdef STM32_BOARD if(USART3_BASE->SR & USART_SR_TXE) { #endif if(tx_head!=tx_tail) { if(++tx_tail>=TXBUFFER_SIZE)//head tx_tail=0; #ifdef STM32_BOARD USART3_BASE->DR=tx_buff[tx_tail];//clears TXE bit #else UDR0=tx_buff[tx_tail]; #endif } if (tx_tail == tx_head) tx_pause(); // Check if all data is transmitted . if yes disable transmitter UDRE interrupt #ifdef STM32_BOARD } #endif } #ifdef STM32_BOARD void usart2_begin(uint32_t baud,uint32_t config ) { usart_init(USART2); usart_config_gpios_async(USART2,GPIOA,PIN_MAP[PA3].gpio_bit,GPIOA,PIN_MAP[PA2].gpio_bit,config); usart_set_baud_rate(USART2, STM32_PCLK1, baud);// usart_enable(USART2); } void usart3_begin(uint32_t baud,uint32_t config ) { usart_init(USART3); usart_config_gpios_async(USART3,GPIOB,PIN_MAP[PB11].gpio_bit,GPIOB,PIN_MAP[PB10].gpio_bit,config); usart_set_baud_rate(USART3, STM32_PCLK1, baud); usart_enable(USART3); } #endif #else //BASH_SERIAL // Routines for bit-bashed serial output // Speed is 0 for 100K and 1 for 9600 void initTXSerial( uint8_t speed) { TIMSK0 = 0 ; // Stop all timer 0 interrupts #ifdef INVERT_SERIAL SERIAL_TX_off; #else SERIAL_TX_on; #endif UCSR0B &= ~(1<<TXEN0) ; SerialControl.speed = speed ; if ( speed == SPEED_9600 ) { OCR0A = 207 ; // 104uS period TCCR0A = 3 ; TCCR0B = 0x0A ; // Fast PMM, 2MHz } else // 100K { TCCR0A = 0 ; TCCR0B = 2 ; // Clock/8 (0.5uS) } } void Serial_write( uint8_t byte ) { uint8_t temp ; uint8_t temp1 ; uint8_t byteLo ; #ifdef INVERT_SERIAL byte = ~byte ; #endif byteLo = byte ; byteLo >>= 7 ; // Top bit if ( SerialControl.speed == SPEED_100K ) { #ifdef INVERT_SERIAL byteLo |= 0x02 ; // Parity bit #else byteLo |= 0xFC ; // Stop bits #endif // calc parity temp = byte ; temp >>= 4 ; temp = byte ^ temp ; temp1 = temp ; temp1 >>= 2 ; temp = temp ^ temp1 ; temp1 = temp ; temp1 <<= 1 ; temp ^= temp1 ; temp &= 0x02 ; #ifdef INVERT_SERIAL byteLo ^= temp ; #else byteLo |= temp ; #endif } else { byteLo |= 0xFE ; // Stop bit } byte <<= 1 ; #ifdef INVERT_SERIAL byte |= 1 ; // Start bit #endif uint8_t next = (SerialControl.head + 2) & 0x3f ; if ( next != SerialControl.tail ) { SerialControl.data[SerialControl.head] = byte ; SerialControl.data[SerialControl.head+1] = byteLo ; SerialControl.head = next ; } if(!IS_TX_PAUSE_on) tx_resume(); } void resumeBashSerial() { cli() ; if ( SerialControl.busy == 0 ) { sei() ; // Start the transmission here #ifdef INVERT_SERIAL GPIOR2 = 0 ; #else GPIOR2 = 0x01 ; #endif if ( SerialControl.speed == SPEED_100K ) { GPIOR1 = 1 ; OCR0B = TCNT0 + 40 ; OCR0A = OCR0B + 210 ; TIFR0 = (1<<OCF0A) | (1<<OCF0B) ; TIMSK0 |= (1<<OCIE0B) ; SerialControl.busy = 1 ; } else { GPIOR1 = 1 ; TIFR0 = (1<<TOV0) ; TIMSK0 |= (1<<TOIE0) ; SerialControl.busy = 1 ; } } else { sei() ; } } // Assume timer0 at 0.5uS clock ISR(TIMER0_COMPA_vect) { uint8_t byte ; byte = GPIOR0 ; if ( byte & 0x01 ) SERIAL_TX_on; else SERIAL_TX_off; byte /= 2 ; // Generates shorter code than byte >>= 1 GPIOR0 = byte ; if ( --GPIOR1 == 0 ) { TIMSK0 &= ~(1<<OCIE0A) ; GPIOR1 = 3 ; } else { OCR0A += 20 ; } } ISR(TIMER0_COMPB_vect) { uint8_t byte ; byte = GPIOR2 ; if ( byte & 0x01 ) SERIAL_TX_on; else SERIAL_TX_off; byte /= 2 ; // Generates shorter code than byte >>= 1 GPIOR2 = byte ; if ( --GPIOR1 == 0 ) { if ( IS_TX_PAUSE_on ) { SerialControl.busy = 0 ; TIMSK0 &= ~(1<<OCIE0B) ; } else { // prepare next byte and allow for 2 stop bits volatile struct t_serial_bash *ptr = &SerialControl ; if ( ptr->head != ptr->tail ) { GPIOR0 = ptr->data[ptr->tail] ; GPIOR2 = ptr->data[ptr->tail+1] ; ptr->tail = ( ptr->tail + 2 ) & 0x3F ; GPIOR1 = 8 ; OCR0A = OCR0B + 40 ; OCR0B = OCR0A + 8 * 20 ; TIMSK0 |= (1<<OCIE0A) ; } else { SerialControl.busy = 0 ; TIMSK0 &= ~(1<<OCIE0B) ; } } } else { OCR0B += 20 ; } } ISR(TIMER0_OVF_vect) { uint8_t byte ; if ( GPIOR1 > 2 ) { byte = GPIOR0 ; } else { byte = GPIOR2 ; } if ( byte & 0x01 ) SERIAL_TX_on; else SERIAL_TX_off; byte /= 2 ; // Generates shorter code than byte >>= 1 if ( GPIOR1 > 2 ) { GPIOR0 = byte ; } else { GPIOR2 = byte ; } if ( --GPIOR1 == 0 ) { // prepare next byte volatile struct t_serial_bash *ptr = &SerialControl ; if ( ptr->head != ptr->tail ) { GPIOR0 = ptr->data[ptr->tail] ; GPIOR2 = ptr->data[ptr->tail+1] ; ptr->tail = ( ptr->tail + 2 ) & 0x3F ; GPIOR1 = 10 ; } else { SerialControl.busy = 0 ; TIMSK0 &= ~(1<<TOIE0) ; } } } #endif // BASH_SERIAL #endif // TELEMETRY