143 lines
3.9 KiB
C++
143 lines
3.9 KiB
C++
/*
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* Authors (alphabetical order)
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* - Andre Bernet <bernet.andre@gmail.com>
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* - Andreas Weitl
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* - Bertrand Songis <bsongis@gmail.com>
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* - Bryan J. Rentoul (Gruvin) <gruvin@gmail.com>
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* - Cameron Weeks <th9xer@gmail.com>
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* - Erez Raviv
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* - Gabriel Birkus
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* - Jean-Pierre Parisy
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* - Karl Szmutny
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* - Michael Blandford
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* - Michal Hlavinka
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* - Pat Mackenzie
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* - Philip Moss
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* - Rob Thomson
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* - Romolo Manfredini <romolo.manfredini@gmail.com>
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* - Thomas Husterer
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*
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* opentx is based on code named
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* gruvin9x by Bryan J. Rentoul: http://code.google.com/p/gruvin9x/,
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* er9x by Erez Raviv: http://code.google.com/p/er9x/,
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* and the original (and ongoing) project by
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* Thomas Husterer, th9x: http://code.google.com/p/th9x/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program 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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*
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*/
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#include "../../opentx.h"
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#if defined(FRSKY)
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void telemetryEnableTx(void)
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{
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UCSR0B |= (1 << TXEN0); // enable TX
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}
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void telemetryEnableRx(void)
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{
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UCSR0B |= (1 << RXEN0); // enable RX
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UCSR0B |= (1 << RXCIE0); // enable Interrupt
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}
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void processSerialData(uint8_t data);
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extern uint8_t frskyRxBufferCount; // TODO not driver, change name
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ISR(USART0_RX_vect)
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{
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uint8_t stat;
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uint8_t data;
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UCSR0B &= ~(1 << RXCIE0); // disable Interrupt
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sei();
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stat = UCSR0A; // USART control and Status Register 0 A
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/*
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bit 7 6 5 4 3 2 1 0
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RxC0 TxC0 UDRE0 FE0 DOR0 UPE0 U2X0 MPCM0
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RxC0: Receive complete
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TXC0: Transmit Complete
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UDRE0: USART Data Register Empty
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FE0: Frame Error
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DOR0: Data OverRun
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UPE0: USART Parity Error
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U2X0: Double Tx Speed
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PCM0: MultiProcessor Comms Mode
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*/
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// rh = UCSR0B; //USART control and Status Register 0 B
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/*
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bit 7 6 5 4 3 2 1 0
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RXCIE0 TxCIE0 UDRIE0 RXEN0 TXEN0 UCSZ02 RXB80 TXB80
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RxCIE0: Receive Complete int enable
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TXCIE0: Transmit Complete int enable
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UDRIE0: USART Data Register Empty int enable
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RXEN0: Rx Enable
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TXEN0: Tx Enable
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UCSZ02: Character Size bit 2
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RXB80: Rx data bit 8
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TXB80: Tx data bit 8
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*/
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data = UDR0; // USART data register 0
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if (stat & ((1 << FE0) | (1 << DOR0) | (1 << UPE0))) {
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// discard buffer and start fresh on any comms error
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frskyRxBufferCount = 0;
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}
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else {
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processSerialData(data);
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}
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cli() ;
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UCSR0B |= (1 << RXCIE0); // enable Interrupt
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}
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void telemetryPortInit()
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{
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#if !defined(SIMU)
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DDRE &= ~(1 << DDE0); // set RXD0 pin as input
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PORTE &= ~(1 << PORTE0); // disable pullup on RXD0 pin
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#undef BAUD
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#define BAUD 9600
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#include <util/setbaud.h>
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UBRR0H = UBRRH_VALUE;
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UBRR0L = UBRRL_VALUE;
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UCSR0A &= ~(1 << U2X0); // disable double speed operation.
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// set 8N1
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UCSR0B = 0 | (0 << RXCIE0) | (0 << TXCIE0) | (0 << UDRIE0) | (0 << RXEN0) | (0 << TXEN0) | (0 << UCSZ02);
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UCSR0C = 0 | (1 << UCSZ01) | (1 << UCSZ00);
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while (UCSR0A & (1 << RXC0)) UDR0; // flush receive buffer
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// These should be running right from power up on a FrSky enabled '9X.
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telemetryEnableTx(); // enable FrSky-Telemetry emission
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frskyTxBufferCount = 0; // TODO not driver code
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telemetryEnableRx(); // enable FrSky-Telemetry reception
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#endif
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}
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void telemetryTransmitBuffer()
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{
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UCSR0B |= (1 << UDRIE0); // enable UDRE0 interrupt
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}
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#endif
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