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tinySA/os/hal/platforms/STM32/serial_lld.c

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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 STM32/serial_lld.c
* @brief STM32 low level serial driver code.
* @addtogroup STM32_SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief USART1 serial driver identifier.*/
#if USE_STM32_USART1 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
/** @brief USART2 serial driver identifier.*/
#if USE_STM32_USART2 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
/** @brief USART3 serial driver identifier.*/
#if USE_STM32_USART3 || defined(__DOXYGEN__)
SerialDriver SD3;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/** @brief Driver default configuration.*/
static const SerialConfig default_config =
{
SERIAL_DEFAULT_BITRATE,
0,
USART_CR2_STOP1_BITS | USART_CR2_LINEN,
0
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief USART initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
static void usart_init(SerialDriver *sdp) {
USART_TypeDef *u = sdp->sd.usart;
/*
* Baud rate setting.
*/
if (sdp->sd.usart == USART1)
u->BRR = APB2CLK / sdp->sd.config->sc_speed;
else
u->BRR = APB1CLK / sdp->sd.config->sc_speed;
/*
* Note that some bits are enforced.
*/
u->CR1 = sdp->sd.config->sc_cr1 | USART_CR1_UE | USART_CR1_PEIE |
USART_CR1_RXNEIE | USART_CR1_TE |
USART_CR1_RE;
u->CR2 = sdp->sd.config->sc_cr2 | USART_CR2_LBDIE;
u->CR3 = sdp->sd.config->sc_cr3 | USART_CR3_EIE;
(void)u->SR; /* SR reset step 1.*/
(void)u->DR; /* SR reset step 2.*/
}
/**
* @brief USART de-initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] u pointer to an USART I/O block
*/
static void usart_deinit(USART_TypeDef *u) {
u->CR1 = 0;
u->CR2 = 0;
u->CR3 = 0;
}
/**
* @brief Error handling routine.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] sr USART SR register value
*/
static void set_error(SerialDriver *sdp, uint16_t sr) {
sdflags_t sts = 0;
if (sr & USART_SR_ORE)
sts |= SD_OVERRUN_ERROR;
if (sr & USART_SR_PE)
sts |= SD_PARITY_ERROR;
if (sr & USART_SR_FE)
sts |= SD_FRAMING_ERROR;
if (sr & USART_SR_NE)
sts |= SD_NOISE_ERROR;
if (sr & USART_SR_LBD)
sts |= SD_BREAK_DETECTED;
chSysLockFromIsr();
sdAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
/**
* @brief Common IRQ handler.
*
* @param[in] sdp communication channel associated to the USART
*/
static void serve_interrupt(SerialDriver *sdp) {
USART_TypeDef *u = sdp->sd.usart;
uint16_t cr1 = u->CR1;
uint16_t sr = u->SR; /* SR reset step 1.*/
uint16_t dr = u->DR; /* SR reset step 2.*/
if (sr & (USART_SR_LBD | USART_SR_ORE | USART_SR_NE |
USART_SR_FE | USART_SR_PE)) {
set_error(sdp, sr);
u->SR = 0; /* Clears the LBD bit in the SR.*/
}
if (sr & USART_SR_RXNE) {
chSysLockFromIsr();
sdIncomingDataI(sdp, (uint8_t)dr);
chSysUnlockFromIsr();
}
if ((cr1 & USART_CR1_TXEIE) && (sr & USART_SR_TXE)) {
msg_t b;
chSysLockFromIsr();
b = chOQGetI(&sdp->sd.oqueue);
if (b < Q_OK) {
chEvtBroadcastI(&sdp->bac.oevent);
u->CR1 = cr1 & ~USART_CR1_TXEIE;
}
else
u->DR = b;
chSysUnlockFromIsr();
}
}
#if USE_STM32_USART1 || defined(__DOXYGEN__)
static void notify1(void) {
USART1->CR1 |= USART_CR1_TXEIE;
}
#endif
#if USE_STM32_USART2 || defined(__DOXYGEN__)
static void notify2(void) {
USART2->CR1 |= USART_CR1_TXEIE;
}
#endif
#if USE_STM32_USART3 || defined(__DOXYGEN__)
static void notify3(void) {
USART3->CR1 |= USART_CR1_TXEIE;
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if USE_STM32_USART1 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(VectorD4) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD1);
CH_IRQ_EPILOGUE();
}
#endif
#if USE_STM32_USART2 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(VectorD8) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD2);
CH_IRQ_EPILOGUE();
}
#endif
#if USE_STM32_USART3 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(VectorDC) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD3);
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* Low level serial driver initialization.
*/
void sd_lld_init(void) {
#if USE_STM32_USART1
sdObjectInit(&SD1, NULL, notify1);
SD1.sd.usart = USART1;
#endif
#if USE_STM32_USART2
sdObjectInit(&SD2, NULL, notify2);
SD2.sd.usart = USART2;
#endif
#if USE_STM32_USART3
sdObjectInit(&SD3, NULL, notify3);
SD3.sd.usart = USART3;
#endif
}
/**
* @brief Low level serial driver configuration and (re)start.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
void sd_lld_start(SerialDriver *sdp) {
if (sdp->sd.config == NULL)
sdp->sd.config = &default_config;
if (sdp->sd.state == SD_STOP) {
#if USE_STM32_USART1
if (&SD1 == sdp) {
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
NVICEnableVector(USART1_IRQn, STM32_USART1_PRIORITY);
}
#endif
#if USE_STM32_USART2
if (&SD2 == sdp) {
RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
NVICEnableVector(USART2_IRQn, STM32_USART2_PRIORITY);
}
#endif
#if USE_STM32_USART3
if (&SD3 == sdp) {
RCC->APB1ENR |= RCC_APB1ENR_USART3EN;
NVICEnableVector(USART3_IRQn, STM32_USART3_PRIORITY);
}
#endif
}
usart_init(sdp);
}
/**
* @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
*/
void sd_lld_stop(SerialDriver *sdp) {
if (sdp->sd.state == SD_READY) {
usart_deinit(sdp->sd.usart);
#if USE_STM32_USART1
if (&SD1 == sdp) {
RCC->APB2ENR &= ~RCC_APB2ENR_USART1EN;
NVICDisableVector(USART1_IRQn);
return;
}
#endif
#if USE_STM32_USART2
if (&SD2 == sdp) {
RCC->APB1ENR &= ~RCC_APB1ENR_USART2EN;
NVICDisableVector(USART2_IRQn);
return;
}
#endif
#if USE_STM32_USART3
if (&SD3 == sdp) {
RCC->APB1ENR &= ~RCC_APB1ENR_USART3EN;
NVICDisableVector(USART3_IRQn);
return;
}
#endif
}
}
#endif /* CH_HAL_USE_SERIAL */
/** @} */
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