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ChibiOS/os/hal/platforms/AVR/serial_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file AVR/serial_lld.c
* @brief AVR low level serial driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief USART0 serial driver identifier.
* @note The name does not follow the convention used in the other ports
* (COMn) because a name conflict with the AVR headers.
*/
#if USE_AVR_USART0 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
/**
* @brief USART1 serial driver identifier.
* @note The name does not follow the convention used in the other ports
* (COMn) because a name conflict with the AVR headers.
*/
#if USE_AVR_USART1 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/**
* @brief Driver default configuration.
*/
static const SerialConfig default_config = {
UBRR(SERIAL_DEFAULT_BITRATE),
USART_CHAR_SIZE_8
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static void set_error(uint8_t sra, SerialDriver *sdp) {
flagsmask_t sts = 0;
uint8_t dor = 0;
uint8_t upe = 0;
uint8_t fe = 0;
#if USE_AVR_USART0
if (&SD1 == sdp) {
dor = (1 << DOR0);
upe = (1 << UPE0);
fe = (1 << FE0);
}
#endif
#if USE_AVR_USART1
if (&SD2 == sdp) {
dor = (1 << DOR1);
upe = (1 << UPE1);
fe = (1 << FE1);
}
#endif
if (sra & dor)
sts |= SD_OVERRUN_ERROR;
if (sra & upe)
sts |= SD_PARITY_ERROR;
if (sra & fe)
sts |= SD_FRAMING_ERROR;
chSysLockFromIsr();
chnAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if USE_AVR_USART0 || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
UCSR0B |= (1 << UDRIE0);
}
/**
* @brief USART0 initialization.
*
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart0_init(const SerialConfig *config) {
UBRR0L = config->sc_brr;
UBRR0H = config->sc_brr >> 8;
UCSR0A = 0;
UCSR0B = (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0);
switch (config->sc_bits_per_char) {
case USART_CHAR_SIZE_5:
UCSR0C = 0;
break;
case USART_CHAR_SIZE_6:
UCSR0C = (1 << UCSZ00);
break;
case USART_CHAR_SIZE_7:
UCSR0C = (1 << UCSZ01);
break;
case USART_CHAR_SIZE_9:
UCSR0B |= (1 << UCSZ02);
UCSR0C = (1 << UCSZ00) | (1 << UCSZ01);
break;
case USART_CHAR_SIZE_8:
default:
UCSR0C = (1 << UCSZ00) | (1 << UCSZ01);
}
}
/**
* @brief USART0 de-initialization.
*/
static void usart0_deinit(void) {
UCSR0A = 0;
UCSR0B = 0;
UCSR0C = 0;
}
#endif
#if USE_AVR_USART1 || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
UCSR1B |= (1 << UDRIE1);
}
/**
* @brief USART1 initialization.
*
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart1_init(const SerialConfig *config) {
UBRR1L = config->sc_brr;
UBRR1H = config->sc_brr >> 8;
UCSR1A = 0;
UCSR1B = (1 << RXEN1) | (1 << TXEN1) | (1 << RXCIE1);
switch (config->sc_bits_per_char) {
case USART_CHAR_SIZE_5:
UCSR1C = 0;
break;
case USART_CHAR_SIZE_6:
UCSR1C = (1 << UCSZ10);
break;
case USART_CHAR_SIZE_7:
UCSR1C = (1 << UCSZ11);
break;
case USART_CHAR_SIZE_9:
UCSR1B |= (1 << UCSZ12);
UCSR1C = (1 << UCSZ10) | (1 << UCSZ11);
break;
case USART_CHAR_SIZE_8:
default:
UCSR1C = (1 << UCSZ10) | (1 << UCSZ11);
}
}
/**
* @brief USART1 de-initialization.
*/
static void usart1_deinit(void) {
UCSR1A = 0;
UCSR1B = 0;
UCSR1C = 0;
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if USE_AVR_USART0 || defined(__DOXYGEN__)
/**
* @brief USART0 RX interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USART0_RX_vect) {
uint8_t sra;
CH_IRQ_PROLOGUE();
sra = UCSR0A;
if (sra & ((1 << DOR0) | (1 << UPE0) | (1 << FE0)))
set_error(sra, &SD1);
chSysLockFromIsr();
sdIncomingDataI(&SD1, UDR0);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
/**
* @brief USART0 TX interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USART0_UDRE_vect) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD1);
chSysUnlockFromIsr();
if (b < Q_OK)
UCSR0B &= ~(1 << UDRIE0);
else
UDR0 = b;
CH_IRQ_EPILOGUE();
}
#endif /* USE_AVR_USART0 */
#if USE_AVR_USART1 || defined(__DOXYGEN__)
/**
* @brief USART1 RX interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USART1_RX_vect) {
uint8_t sra;
CH_IRQ_PROLOGUE();
sra = UCSR1A;
if (sra & ((1 << DOR1) | (1 << UPE1) | (1 << FE1)))
set_error(sra, &SD2);
chSysLockFromIsr();
sdIncomingDataI(&SD2, UDR1);
chSysUnlockFromIsr();
CH_IRQ_EPILOGUE();
}
/**
* @brief USART1 TX interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USART1_UDRE_vect) {
msg_t b;
CH_IRQ_PROLOGUE();
chSysLockFromIsr();
b = sdRequestDataI(&SD2);
chSysUnlockFromIsr();
if (b < Q_OK)
UCSR1B &= ~(1 << UDRIE1);
else
UDR1 = b;
CH_IRQ_EPILOGUE();
}
#endif /* USE_AVR_USART1 */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if USE_AVR_USART0
sdObjectInit(&SD1, NULL, notify1);
#endif
#if USE_AVR_USART1
sdObjectInit(&SD2, NULL, notify2);
#endif
}
/**
* @brief Low level serial driver configuration and (re)start.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] config the architecture-dependent serial driver configuration.
* If this parameter is set to @p NULL then a default
* configuration is used.
*
* @notapi
*/
void sd_lld_start(SerialDriver *sdp, const SerialConfig *config) {
if (config == NULL)
config = &default_config;
#if USE_AVR_USART0
if (&SD1 == sdp) {
usart0_init(config);
return;
}
#endif
#if USE_AVR_USART1
if (&SD2 == sdp) {
usart1_init(config);
return;
}
#endif
}
/**
* @brief Low level serial driver stop.
* @details De-initializes the USART, stops the associated clock, resets the
* interrupt vector.
*
* @param[in] sdp pointer to a @p SerialDriver object
*
* @notapi
*/
void sd_lld_stop(SerialDriver *sdp) {
#if USE_AVR_USART0
if (&SD1 == sdp)
usart0_deinit();
#endif
#if USE_AVR_USART1
if (&SD2 == sdp)
usart1_deinit();
#endif
}
#endif /* HAL_USE_SERIAL */
/** @} */
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