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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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.
ChibiOS/RT 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file ports/AVR/avr_serial.c
* @brief AVR Serial driver code.
* @addtogroup AVR_SERIAL
* @{
*/
#include <ch.h>
#include "avr_serial.h"
static void SetError(uint8_t sra, FullDuplexDriver *com) {
dflags_t sts = 0;
if (sra & (1 << DOR))
sts |= SD_OVERRUN_ERROR;
if (sra & (1 << UPE))
sts |= SD_PARITY_ERROR;
if (sra & (1 << FE))
sts |= SD_FRAMING_ERROR;
chSysLockFromIsr();
chFDDAddFlagsI(com, sts);
chSysUnlockFromIsr();
}
#if USE_AVR_USART0 || defined(__DOXYGEN__)
/** @brief USART0 serial driver identifier.*/
FullDuplexDriver SER1;
static uint8_t ib1[SERIAL_BUFFERS_SIZE];
static uint8_t ob1[SERIAL_BUFFERS_SIZE];
CH_IRQ_HANDLER(USART0_RX_vect) {
uint8_t sra;
CH_IRQ_PROLOGUE();
sra = UCSR0A;
if (sra & ((1 << DOR) | (1 << UPE) | (1 << FE)))
SetError(sra, &SER1);
chSysLockFromIsr();
chFDDIncomingDataI(&SER1, UDR0);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
CH_IRQ_HANDLER(USART0_UDRE_vect) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = chFDDRequestDataI(&SER1);
chSysUnlockFromIsr();
if (b < Q_OK)
UCSR0B &= ~(1 << UDRIE);
else
UDR0 = b;
CH_IRQ_EPILOGUE();
}
static void OutNotify1(void) {
UCSR0B |= (1 << UDRIE);
}
/**
* @brief USART0 setup.
* @details This function must be invoked with interrupts disabled.
* @param[in] brr the divider value as calculated by the @p UBRR() macro
* @param[in] csrc the value for the @p UCSR0C register
* @note Must be invoked with interrupts disabled.
* @note Does not reset the I/O queues.
*/
void usart0_setup(uint16_t brr, uint8_t csrc) {
UBRR0L = brr;
UBRR0H = brr >> 8;
UCSR0A = 0;
UCSR0B = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);
UCSR0C = csrc;
}
#endif /* USE_AVR_USART0 */
#if USE_AVR_USART1 || defined(__DOXYGEN__)
/** @brief USART1 serial driver identifier.*/
FullDuplexDriver SER2;
static uint8_t ib2[SERIAL_BUFFERS_SIZE];
static uint8_t ob2[SERIAL_BUFFERS_SIZE];
CH_IRQ_HANDLER(USART1_RX_vect) {
uint8_t sra;
CH_IRQ_PROLOGUE();
sra = UCSR1A;
if (sra & ((1 << DOR) | (1 << UPE) | (1 << FE)))
SetError(sra, &SER2);
chSysLockFromIsr();
chFDDIncomingDataI(&SER2, UDR1);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
CH_IRQ_HANDLER(USART1_UDRE_vect) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = chFDDRequestDataI(&SER2);
chSysUnlockFromIsr();
if (b < Q_OK)
UCSR1B &= ~(1 << UDRIE);
else
UDR1 = b;
CH_IRQ_EPILOGUE();
}
static void OutNotify2(void) {
UCSR1B |= (1 << UDRIE);
}
/**
* @brief USART1 setup.
* @details This function must be invoked with interrupts disabled.
* @param[in] brr the divider value as calculated by the @p UBRR() macro
* @param[in] csrc the value for the @p UCSR1C register
* @note Must be invoked with interrupts disabled.
* @note Does not reset the I/O queues.
*/
void usart1_setup(uint16_t brr, uint8_t csrc) {
UBRR1L = brr;
UBRR1H = brr >> 8;
UCSR1A = 0;
UCSR1B = (1 << RXEN) | (1 << TXEN) | (1 << RXCIE);
UCSR1C = csrc;
}
#endif /* USE_AVR_USART1 */
/**
* @brief Serial driver initialization.
* @note The serial ports are initialized at @p 38400-8-N-1 by default.
*/
void serial_init(void) {
#if USE_AVR_USART0
/* I/O queues setup.*/
chFDDInit(&SER1, ib1, sizeof ib1, NULL, ob1, sizeof ob1, OutNotify1);
usart0_setup(UBRR(DEFAULT_USART_BITRATE), (1 << UCSZ1) | (1 << UCSZ0));
#endif
#if USE_AVR_USART1
chFDDInit(&SER2, ib2, sizeof ib2, NULL, ob2, sizeof ob2, OutNotify2);
usart1_setup(UBRR(DEFAULT_USART_BITRATE), (1 << UCSZ1) | (1 << UCSZ0));
#endif
}
/** @} */
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