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tinySA/os/hal/ports/STM32/LLD/USARTv2/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 STM32/USARTv2/serial_lld.c
* @brief STM32 low level serial driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief USART1 serial driver identifier.*/
#if STM32_SERIAL_USE_USART1 || defined(__DOXYGEN__)
SerialDriver SD1;
#endif
/** @brief USART2 serial driver identifier.*/
#if STM32_SERIAL_USE_USART2 || defined(__DOXYGEN__)
SerialDriver SD2;
#endif
/** @brief USART3 serial driver identifier.*/
#if STM32_SERIAL_USE_USART3 || defined(__DOXYGEN__)
SerialDriver SD3;
#endif
/** @brief UART4 serial driver identifier.*/
#if STM32_SERIAL_USE_UART4 || defined(__DOXYGEN__)
SerialDriver SD4;
#endif
/** @brief UART5 serial driver identifier.*/
#if STM32_SERIAL_USE_UART5 || defined(__DOXYGEN__)
SerialDriver SD5;
#endif
/** @brief USART6 serial driver identifier.*/
#if STM32_SERIAL_USE_USART6 || defined(__DOXYGEN__)
SerialDriver SD6;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/** @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
* @param[in] config the architecture-dependent serial driver configuration
*/
static void usart_init(SerialDriver *sdp, const SerialConfig *config) {
USART_TypeDef *u = sdp->usart;
/* Baud rate setting.*/
u->BRR = (uint16_t)(sdp->clock / config->speed);
/* Note that some bits are enforced.*/
u->CR2 = config->cr2 | USART_CR2_LBDIE;
u->CR3 = config->cr3 | USART_CR3_EIE;
u->CR1 = config->cr1 | USART_CR1_UE | USART_CR1_PEIE |
USART_CR1_RXNEIE | USART_CR1_TE |
USART_CR1_RE;
u->ICR = 0xFFFFFFFF;
}
/**
* @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] isr USART ISR register value
*/
static void set_error(SerialDriver *sdp, uint32_t isr) {
eventflags_t sts = 0;
if (isr & USART_ISR_ORE)
sts |= SD_OVERRUN_ERROR;
if (isr & USART_ISR_PE)
sts |= SD_PARITY_ERROR;
if (isr & USART_ISR_FE)
sts |= SD_FRAMING_ERROR;
if (isr & USART_ISR_NE)
sts |= SD_NOISE_ERROR;
osalSysLockFromISR();
chnAddFlagsI(sdp, sts);
osalSysUnlockFromISR();
}
/**
* @brief Common IRQ handler.
*
* @param[in] sdp communication channel associated to the USART
*/
static void serve_interrupt(SerialDriver *sdp) {
USART_TypeDef *u = sdp->usart;
uint32_t cr1 = u->CR1;
uint32_t isr;
/* Reading and clearing status.*/
isr = u->ISR;
u->ICR = isr;
/* Error condition detection.*/
if (isr & (USART_ISR_ORE | USART_ISR_NE | USART_ISR_FE | USART_ISR_PE))
set_error(sdp, isr);
/* Special case, LIN break detection.*/
if (isr & USART_ISR_LBD) {
osalSysLockFromISR();
chnAddFlagsI(sdp, SD_BREAK_DETECTED);
osalSysUnlockFromISR();
}
/* Data available.*/
if (isr & USART_ISR_RXNE) {
osalSysLockFromISR();
sdIncomingDataI(sdp, (uint8_t)u->RDR);
osalSysUnlockFromISR();
}
/* Transmission buffer empty.*/
if ((cr1 & USART_CR1_TXEIE) && (isr & USART_ISR_TXE)) {
msg_t b;
osalSysLockFromISR();
b = oqGetI(&sdp->oqueue);
if (b < Q_OK) {
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
u->CR1 = (cr1 & ~USART_CR1_TXEIE) | USART_CR1_TCIE;
}
else
u->TDR = b;
osalSysUnlockFromISR();
}
/* Physical transmission end.*/
if (isr & USART_ISR_TC) {
osalSysLockFromISR();
if (oqIsEmptyI(&sdp->oqueue))
chnAddFlagsI(sdp, CHN_TRANSMISSION_END);
u->CR1 = cr1 & ~USART_CR1_TCIE;
osalSysUnlockFromISR();
}
}
#if STM32_SERIAL_USE_USART1 || defined(__DOXYGEN__)
static void notify1(io_queue_t *qp) {
(void)qp;
USART1->CR1 |= USART_CR1_TXEIE;
}
#endif
#if STM32_SERIAL_USE_USART2 || defined(__DOXYGEN__)
static void notify2(io_queue_t *qp) {
(void)qp;
USART2->CR1 |= USART_CR1_TXEIE;
}
#endif
#if STM32_SERIAL_USE_USART3 || defined(__DOXYGEN__)
static void notify3(io_queue_t *qp) {
(void)qp;
USART3->CR1 |= USART_CR1_TXEIE;
}
#endif
#if STM32_SERIAL_USE_UART4 || defined(__DOXYGEN__)
static void notify4(io_queue_t *qp) {
(void)qp;
UART4->CR1 |= USART_CR1_TXEIE;
}
#endif
#if STM32_SERIAL_USE_UART5 || defined(__DOXYGEN__)
static void notify5(io_queue_t *qp) {
(void)qp;
UART5->CR1 |= USART_CR1_TXEIE;
}
#endif
#if STM32_SERIAL_USE_USART6 || defined(__DOXYGEN__)
static void notify6(io_queue_t *qp) {
(void)qp;
USART6->CR1 |= USART_CR1_TXEIE;
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM32_SERIAL_USE_USART1 || defined(__DOXYGEN__)
#if !defined(STM32_USART1_HANDLER)
#error "STM32_USART1_HANDLER not defined"
#endif
/**
* @brief USART1 interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_USART1_HANDLER) {
OSAL_IRQ_PROLOGUE();
serve_interrupt(&SD1);
OSAL_IRQ_EPILOGUE();
}
#endif
#if STM32_SERIAL_USE_USART2 || defined(__DOXYGEN__)
#if !defined(STM32_USART2_HANDLER)
#error "STM32_USART2_HANDLER not defined"
#endif
/**
* @brief USART2 interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_USART2_HANDLER) {
OSAL_IRQ_PROLOGUE();
serve_interrupt(&SD2);
OSAL_IRQ_EPILOGUE();
}
#endif
#if STM32_SERIAL_USE_USART3 || defined(__DOXYGEN__)
#if !defined(STM32_USART3_HANDLER)
#error "STM32_USART3_HANDLER not defined"
#endif
/**
* @brief USART3 interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_USART3_HANDLER) {
OSAL_IRQ_PROLOGUE();
serve_interrupt(&SD3);
OSAL_IRQ_EPILOGUE();
}
#endif
#if STM32_SERIAL_USE_UART4 || defined(__DOXYGEN__)
#if !defined(STM32_UART4_HANDLER)
#error "STM32_UART4_HANDLER not defined"
#endif
/**
* @brief UART4 interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_UART4_HANDLER) {
OSAL_IRQ_PROLOGUE();
serve_interrupt(&SD4);
OSAL_IRQ_EPILOGUE();
}
#endif
#if STM32_SERIAL_USE_UART5 || defined(__DOXYGEN__)
#if !defined(STM32_UART5_HANDLER)
#error "STM32_UART5_HANDLER not defined"
#endif
/**
* @brief UART5 interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_UART5_HANDLER) {
OSAL_IRQ_PROLOGUE();
serve_interrupt(&SD5);
OSAL_IRQ_EPILOGUE();
}
#endif
#if STM32_SERIAL_USE_USART6 || defined(__DOXYGEN__)
#if !defined(STM32_USART6_HANDLER)
#error "STM32_USART6_HANDLER not defined"
#endif
/**
* @brief USART1 interrupt handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_USART6_HANDLER) {
OSAL_IRQ_PROLOGUE();
serve_interrupt(&SD6);
OSAL_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if STM32_SERIAL_USE_USART1
sdObjectInit(&SD1, NULL, notify1);
SD1.usart = USART1;
SD1.clock = STM32_USART1CLK;
#endif
#if STM32_SERIAL_USE_USART2
sdObjectInit(&SD2, NULL, notify2);
SD2.usart = USART2;
SD2.clock = STM32_USART2CLK;
#endif
#if STM32_SERIAL_USE_USART3
sdObjectInit(&SD3, NULL, notify3);
SD3.usart = USART3;
SD3.clock = STM32_USART3CLK;
#endif
#if STM32_SERIAL_USE_UART4
sdObjectInit(&SD4, NULL, notify4);
SD4.usart = UART4;
SD4.clock = STM32_UART4CLK;
#endif
#if STM32_SERIAL_USE_UART5
sdObjectInit(&SD5, NULL, notify5);
SD5.usart = UART5;
SD5.clock = STM32_UART5CLK;
#endif
#if STM32_SERIAL_USE_USART6
sdObjectInit(&SD6, NULL, notify6);
SD6.usart = USART6;
SD6.clock = STM32_USART6CLK;
#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 (sdp->state == SD_STOP) {
#if STM32_SERIAL_USE_USART1
if (&SD1 == sdp) {
rccEnableUSART1(FALSE);
nvicEnableVector(STM32_USART1_NUMBER, STM32_SERIAL_USART1_PRIORITY);
}
#endif
#if STM32_SERIAL_USE_USART2
if (&SD2 == sdp) {
rccEnableUSART2(FALSE);
nvicEnableVector(STM32_USART2_NUMBER, STM32_SERIAL_USART2_PRIORITY);
}
#endif
#if STM32_SERIAL_USE_USART3
if (&SD3 == sdp) {
rccEnableUSART3(FALSE);
nvicEnableVector(STM32_USART3_NUMBER, STM32_SERIAL_USART3_PRIORITY);
}
#endif
#if STM32_SERIAL_USE_UART4
if (&SD4 == sdp) {
rccEnableUART4(FALSE);
nvicEnableVector(STM32_UART4_NUMBER, STM32_SERIAL_UART4_PRIORITY);
}
#endif
#if STM32_SERIAL_USE_UART5
if (&SD5 == sdp) {
rccEnableUART5(FALSE);
nvicEnableVector(STM32_UART5_NUMBER, STM32_SERIAL_UART5_PRIORITY);
}
#endif
#if STM32_SERIAL_USE_USART6
if (&SD6 == sdp) {
rccEnableUSART6(FALSE);
nvicEnableVector(STM32_USART6_NUMBER, STM32_SERIAL_USART6_PRIORITY);
}
#endif
}
usart_init(sdp, config);
}
/**
* @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 (sdp->state == SD_READY) {
usart_deinit(sdp->usart);
#if STM32_SERIAL_USE_USART1
if (&SD1 == sdp) {
rccDisableUSART1(FALSE);
nvicDisableVector(STM32_USART1_NUMBER);
return;
}
#endif
#if STM32_SERIAL_USE_USART2
if (&SD2 == sdp) {
rccDisableUSART2(FALSE);
nvicDisableVector(STM32_USART2_NUMBER);
return;
}
#endif
#if STM32_SERIAL_USE_USART3
if (&SD3 == sdp) {
rccDisableUSART3(FALSE);
nvicDisableVector(STM32_USART3_NUMBER);
return;
}
#endif
#if STM32_SERIAL_USE_UART4
if (&SD4 == sdp) {
rccDisableUART4(FALSE);
nvicDisableVector(STM32_UART4_NUMBER);
return;
}
#endif
#if STM32_SERIAL_USE_UART5
if (&SD5 == sdp) {
rccDisableUART5(FALSE);
nvicDisableVector(STM32_UART5_NUMBER);
return;
}
#endif
#if STM32_SERIAL_USE_USART6
if (&SD6 == sdp) {
rccDisableUSART6(FALSE);
nvicDisableVector(STM32_USART6_NUMBER);
return;
}
#endif
}
}
#endif /* HAL_USE_SERIAL */
/** @} */
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