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tinySA/os/hal/platforms/STM32/USARTv1/uart_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/USARTv1/uart_lld.c
* @brief STM32 low level UART driver code.
*
* @addtogroup UART
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_UART || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#define USART1_RX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART1_RX_DMA_STREAM, \
STM32_USART1_RX_DMA_CHN)
#define USART1_TX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART1_TX_DMA_STREAM, \
STM32_USART1_TX_DMA_CHN)
#define USART2_RX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART2_RX_DMA_STREAM, \
STM32_USART2_RX_DMA_CHN)
#define USART2_TX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART2_TX_DMA_STREAM, \
STM32_USART2_TX_DMA_CHN)
#define USART3_RX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART3_RX_DMA_STREAM, \
STM32_USART3_RX_DMA_CHN)
#define USART3_TX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART3_TX_DMA_STREAM, \
STM32_USART3_TX_DMA_CHN)
#define USART6_RX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART6_RX_DMA_STREAM, \
STM32_USART6_RX_DMA_CHN)
#define USART6_TX_DMA_CHANNEL \
STM32_DMA_GETCHANNEL(STM32_UART_USART6_TX_DMA_STREAM, \
STM32_USART6_TX_DMA_CHN)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief USART1 UART driver identifier.*/
#if STM32_UART_USE_USART1 || defined(__DOXYGEN__)
UARTDriver UARTD1;
#endif
/** @brief USART2 UART driver identifier.*/
#if STM32_UART_USE_USART2 || defined(__DOXYGEN__)
UARTDriver UARTD2;
#endif
/** @brief USART3 UART driver identifier.*/
#if STM32_UART_USE_USART3 || defined(__DOXYGEN__)
UARTDriver UARTD3;
#endif
/** @brief USART6 UART driver identifier.*/
#if STM32_UART_USE_USART6 || defined(__DOXYGEN__)
UARTDriver UARTD6;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Status bits translation.
*
* @param[in] sr USART SR register value
*
* @return The error flags.
*/
static uartflags_t translate_errors(uint16_t sr) {
uartflags_t sts = 0;
if (sr & USART_SR_ORE)
sts |= UART_OVERRUN_ERROR;
if (sr & USART_SR_PE)
sts |= UART_PARITY_ERROR;
if (sr & USART_SR_FE)
sts |= UART_FRAMING_ERROR;
if (sr & USART_SR_NE)
sts |= UART_NOISE_ERROR;
if (sr & USART_SR_LBD)
sts |= UART_BREAK_DETECTED;
return sts;
}
/**
* @brief Puts the receiver in the UART_RX_IDLE state.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void set_rx_idle_loop(UARTDriver *uartp) {
uint32_t mode;
/* RX DMA channel preparation, if the char callback is defined then the
TCIE interrupt is enabled too.*/
if (uartp->config->rxchar_cb == NULL)
mode = STM32_DMA_CR_DIR_P2M | STM32_DMA_CR_CIRC;
else
mode = STM32_DMA_CR_DIR_P2M | STM32_DMA_CR_CIRC | STM32_DMA_CR_TCIE;
dmaStreamSetMemory0(uartp->dmarx, &uartp->rxbuf);
dmaStreamSetTransactionSize(uartp->dmarx, 1);
dmaStreamSetMode(uartp->dmarx, uartp->dmamode | mode);
dmaStreamEnable(uartp->dmarx);
}
/**
* @brief USART de-initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void usart_stop(UARTDriver *uartp) {
/* Stops RX and TX DMA channels.*/
dmaStreamDisable(uartp->dmarx);
dmaStreamDisable(uartp->dmatx);
/* Stops USART operations.*/
uartp->usart->CR1 = 0;
uartp->usart->CR2 = 0;
uartp->usart->CR3 = 0;
}
/**
* @brief USART initialization.
* @details This function must be invoked with interrupts disabled.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void usart_start(UARTDriver *uartp) {
uint16_t cr1;
USART_TypeDef *u = uartp->usart;
/* Defensive programming, starting from a clean state.*/
usart_stop(uartp);
/* Baud rate setting.*/
#if STM32_HAS_USART6
if ((uartp->usart == USART1) || (uartp->usart == USART6))
#else
if (uartp->usart == USART1)
#endif
u->BRR = STM32_PCLK2 / uartp->config->speed;
else
u->BRR = STM32_PCLK1 / uartp->config->speed;
/* Resetting eventual pending status flags.*/
(void)u->SR; /* SR reset step 1.*/
(void)u->DR; /* SR reset step 2.*/
u->SR = 0;
/* Note that some bits are enforced because required for correct driver
operations.*/
u->CR2 = uartp->config->cr2 | USART_CR2_LBDIE;
u->CR3 = uartp->config->cr3 | USART_CR3_DMAT | USART_CR3_DMAR |
USART_CR3_EIE;
if (uartp->config->txend2_cb == NULL)
cr1 = USART_CR1_UE | USART_CR1_PEIE | USART_CR1_TE | USART_CR1_RE;
else
cr1 = USART_CR1_UE | USART_CR1_PEIE | USART_CR1_TE | USART_CR1_RE |
USART_CR1_TCIE;
u->CR1 = uartp->config->cr1 | cr1;
/* Starting the receiver idle loop.*/
set_rx_idle_loop(uartp);
}
/**
* @brief RX DMA common service routine.
*
* @param[in] uartp pointer to the @p UARTDriver object
* @param[in] flags pre-shifted content of the ISR register
*/
static void uart_lld_serve_rx_end_irq(UARTDriver *uartp, uint32_t flags) {
/* DMA errors handling.*/
#if defined(STM32_UART_DMA_ERROR_HOOK)
if ((flags & (STM32_DMA_ISR_TEIF | STM32_DMA_ISR_DMEIF)) != 0) {
STM32_UART_DMA_ERROR_HOOK(uartp);
}
#else
(void)flags;
#endif
if (uartp->rxstate == UART_RX_IDLE) {
/* Receiver in idle state, a callback is generated, if enabled, for each
received character and then the driver stays in the same state.*/
if (uartp->config->rxchar_cb != NULL)
uartp->config->rxchar_cb(uartp, uartp->rxbuf);
}
else {
/* Receiver in active state, a callback is generated, if enabled, after
a completed transfer.*/
dmaStreamDisable(uartp->dmarx);
uartp->rxstate = UART_RX_COMPLETE;
if (uartp->config->rxend_cb != NULL)
uartp->config->rxend_cb(uartp);
/* If the callback didn't explicitly change state then the receiver
automatically returns to the idle state.*/
if (uartp->rxstate == UART_RX_COMPLETE) {
uartp->rxstate = UART_RX_IDLE;
set_rx_idle_loop(uartp);
}
}
}
/**
* @brief TX DMA common service routine.
*
* @param[in] uartp pointer to the @p UARTDriver object
* @param[in] flags pre-shifted content of the ISR register
*/
static void uart_lld_serve_tx_end_irq(UARTDriver *uartp, uint32_t flags) {
/* DMA errors handling.*/
#if defined(STM32_UART_DMA_ERROR_HOOK)
if ((flags & (STM32_DMA_ISR_TEIF | STM32_DMA_ISR_DMEIF)) != 0) {
STM32_UART_DMA_ERROR_HOOK(uartp);
}
#else
(void)flags;
#endif
dmaStreamDisable(uartp->dmatx);
/* A callback is generated, if enabled, after a completed transfer.*/
uartp->txstate = UART_TX_COMPLETE;
if (uartp->config->txend1_cb != NULL)
uartp->config->txend1_cb(uartp);
/* If the callback didn't explicitly change state then the transmitter
automatically returns to the idle state.*/
if (uartp->txstate == UART_TX_COMPLETE)
uartp->txstate = UART_TX_IDLE;
}
/**
* @brief USART common service routine.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
static void serve_usart_irq(UARTDriver *uartp) {
uint16_t sr;
USART_TypeDef *u = uartp->usart;
sr = u->SR; /* SR reset step 1.*/
(void)u->DR; /* SR reset step 2.*/
if (sr & (USART_SR_LBD | USART_SR_ORE | USART_SR_NE |
USART_SR_FE | USART_SR_PE)) {
u->SR = ~USART_SR_LBD;
if (uartp->config->rxerr_cb != NULL)
uartp->config->rxerr_cb(uartp, translate_errors(sr));
}
if (sr & USART_SR_TC) {
u->SR = ~USART_SR_TC;
/* End of transmission, a callback is generated.*/
if (uartp->config->txend2_cb != NULL)
uartp->config->txend2_cb(uartp);
}
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM32_UART_USE_USART1 || defined(__DOXYGEN__)
#if !defined(STM32_USART1_HANDLER)
#error "STM32_USART1_HANDLER not defined"
#endif
/**
* @brief USART1 IRQ handler.
*
* @isr
*/
CH_IRQ_HANDLER(STM32_USART1_HANDLER) {
CH_IRQ_PROLOGUE();
serve_usart_irq(&UARTD1);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_UART_USE_USART1 */
#if STM32_UART_USE_USART2 || defined(__DOXYGEN__)
#if !defined(STM32_USART2_HANDLER)
#error "STM32_USART2_HANDLER not defined"
#endif
/**
* @brief USART2 IRQ handler.
*
* @isr
*/
CH_IRQ_HANDLER(STM32_USART2_HANDLER) {
CH_IRQ_PROLOGUE();
serve_usart_irq(&UARTD2);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_UART_USE_USART2 */
#if STM32_UART_USE_USART3 || defined(__DOXYGEN__)
#if !defined(STM32_USART3_HANDLER)
#error "STM32_USART3_HANDLER not defined"
#endif
/**
* @brief USART3 IRQ handler.
*
* @isr
*/
CH_IRQ_HANDLER(STM32_USART3_HANDLER) {
CH_IRQ_PROLOGUE();
serve_usart_irq(&UARTD3);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_UART_USE_USART3 */
#if STM32_UART_USE_USART6 || defined(__DOXYGEN__)
#if !defined(STM32_USART6_HANDLER)
#error "STM32_USART6_HANDLER not defined"
#endif
/**
* @brief USART6 IRQ handler.
*
* @isr
*/
CH_IRQ_HANDLER(STM32_USART6_HANDLER) {
CH_IRQ_PROLOGUE();
serve_usart_irq(&UARTD6);
CH_IRQ_EPILOGUE();
}
#endif /* STM32_UART_USE_USART6 */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level UART driver initialization.
*
* @notapi
*/
void uart_lld_init(void) {
#if STM32_UART_USE_USART1
uartObjectInit(&UARTD1);
UARTD1.usart = USART1;
UARTD1.dmamode = STM32_DMA_CR_DMEIE | STM32_DMA_CR_TEIE;
UARTD1.dmarx = STM32_DMA_STREAM(STM32_UART_USART1_RX_DMA_STREAM);
UARTD1.dmatx = STM32_DMA_STREAM(STM32_UART_USART1_TX_DMA_STREAM);
#endif
#if STM32_UART_USE_USART2
uartObjectInit(&UARTD2);
UARTD2.usart = USART2;
UARTD2.dmamode = STM32_DMA_CR_DMEIE | STM32_DMA_CR_TEIE;
UARTD2.dmarx = STM32_DMA_STREAM(STM32_UART_USART2_RX_DMA_STREAM);
UARTD2.dmatx = STM32_DMA_STREAM(STM32_UART_USART2_TX_DMA_STREAM);
#endif
#if STM32_UART_USE_USART3
uartObjectInit(&UARTD3);
UARTD3.usart = USART3;
UARTD3.dmamode = STM32_DMA_CR_DMEIE | STM32_DMA_CR_TEIE;
UARTD3.dmarx = STM32_DMA_STREAM(STM32_UART_USART3_RX_DMA_STREAM);
UARTD3.dmatx = STM32_DMA_STREAM(STM32_UART_USART3_TX_DMA_STREAM);
#endif
#if STM32_UART_USE_USART6
uartObjectInit(&UARTD6);
UARTD6.usart = USART6;
UARTD6.dmarx = STM32_DMA_STREAM(STM32_UART_USART6_RX_DMA_STREAM);
UARTD6.dmatx = STM32_DMA_STREAM(STM32_UART_USART6_TX_DMA_STREAM);
#endif
}
/**
* @brief Configures and activates the UART peripheral.
*
* @param[in] uartp pointer to the @p UARTDriver object
*
* @notapi
*/
void uart_lld_start(UARTDriver *uartp) {
if (uartp->state == UART_STOP) {
#if STM32_UART_USE_USART1
if (&UARTD1 == uartp) {
bool_t b;
b = dmaStreamAllocate(uartp->dmarx,
STM32_UART_USART1_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_rx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #1", "stream already allocated");
b = dmaStreamAllocate(uartp->dmatx,
STM32_UART_USART1_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_tx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #2", "stream already allocated");
rccEnableUSART1(FALSE);
nvicEnableVector(STM32_USART1_NUMBER,
CORTEX_PRIORITY_MASK(STM32_UART_USART1_IRQ_PRIORITY));
uartp->dmamode |= STM32_DMA_CR_CHSEL(USART1_RX_DMA_CHANNEL) |
STM32_DMA_CR_PL(STM32_UART_USART1_DMA_PRIORITY);
}
#endif
#if STM32_UART_USE_USART2
if (&UARTD2 == uartp) {
bool_t b;
b = dmaStreamAllocate(uartp->dmarx,
STM32_UART_USART2_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_rx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #3", "stream already allocated");
b = dmaStreamAllocate(uartp->dmatx,
STM32_UART_USART2_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_tx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #4", "stream already allocated");
rccEnableUSART2(FALSE);
nvicEnableVector(STM32_USART2_NUMBER,
CORTEX_PRIORITY_MASK(STM32_UART_USART2_IRQ_PRIORITY));
uartp->dmamode |= STM32_DMA_CR_CHSEL(USART2_RX_DMA_CHANNEL) |
STM32_DMA_CR_PL(STM32_UART_USART2_DMA_PRIORITY);
}
#endif
#if STM32_UART_USE_USART3
if (&UARTD3 == uartp) {
bool_t b;
b = dmaStreamAllocate(uartp->dmarx,
STM32_UART_USART3_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_rx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #5", "stream already allocated");
b = dmaStreamAllocate(uartp->dmatx,
STM32_UART_USART3_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_tx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #6", "stream already allocated");
rccEnableUSART3(FALSE);
nvicEnableVector(STM32_USART3_NUMBER,
CORTEX_PRIORITY_MASK(STM32_UART_USART3_IRQ_PRIORITY));
uartp->dmamode |= STM32_DMA_CR_CHSEL(USART3_RX_DMA_CHANNEL) |
STM32_DMA_CR_PL(STM32_UART_USART3_DMA_PRIORITY);
}
#endif
#if STM32_UART_USE_USART6
if (&UARTD6 == uartp) {
bool_t b;
b = dmaStreamAllocate(uartp->dmarx,
STM32_UART_USART6_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_rx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #5", "stream already allocated");
b = dmaStreamAllocate(uartp->dmatx,
STM32_UART_USART6_IRQ_PRIORITY,
(stm32_dmaisr_t)uart_lld_serve_tx_end_irq,
(void *)uartp);
chDbgAssert(!b, "uart_lld_start(), #6", "stream already allocated");
rccEnableUSART6(FALSE);
nvicEnableVector(STM32_USART6_NUMBER,
CORTEX_PRIORITY_MASK(STM32_UART_USART6_IRQ_PRIORITY));
uartp->dmamode |= STM32_DMA_CR_CHSEL(USART6_RX_DMA_CHANNEL) |
STM32_DMA_CR_PL(STM32_UART_USART6_DMA_PRIORITY);
}
#endif
/* Static DMA setup, the transfer size depends on the USART settings,
it is 16 bits if M=1 and PCE=0 else it is 8 bits.*/
if ((uartp->config->cr1 & (USART_CR1_M | USART_CR1_PCE)) == USART_CR1_M)
uartp->dmamode |= STM32_DMA_CR_PSIZE_HWORD | STM32_DMA_CR_MSIZE_HWORD;
dmaStreamSetPeripheral(uartp->dmarx, &uartp->usart->DR);
dmaStreamSetPeripheral(uartp->dmatx, &uartp->usart->DR);
uartp->rxbuf = 0;
}
uartp->rxstate = UART_RX_IDLE;
uartp->txstate = UART_TX_IDLE;
usart_start(uartp);
}
/**
* @brief Deactivates the UART peripheral.
*
* @param[in] uartp pointer to the @p UARTDriver object
*
* @notapi
*/
void uart_lld_stop(UARTDriver *uartp) {
if (uartp->state == UART_READY) {
usart_stop(uartp);
dmaStreamRelease(uartp->dmarx);
dmaStreamRelease(uartp->dmatx);
#if STM32_UART_USE_USART1
if (&UARTD1 == uartp) {
nvicDisableVector(STM32_USART1_NUMBER);
rccDisableUSART1(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART2
if (&UARTD2 == uartp) {
nvicDisableVector(STM32_USART2_NUMBER);
rccDisableUSART2(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART3
if (&UARTD3 == uartp) {
nvicDisableVector(STM32_USART3_NUMBER);
rccDisableUSART3(FALSE);
return;
}
#endif
#if STM32_UART_USE_USART6
if (&UARTD6 == uartp) {
nvicDisableVector(STM32_USART6_NUMBER);
rccDisableUSART6(FALSE);
return;
}
#endif
}
}
/**
* @brief Starts a transmission on the UART peripheral.
* @note The buffers are organized as uint8_t arrays for data sizes below
* or equal to 8 bits else it is organized as uint16_t arrays.
*
* @param[in] uartp pointer to the @p UARTDriver object
* @param[in] n number of data frames to send
* @param[in] txbuf the pointer to the transmit buffer
*
* @notapi
*/
void uart_lld_start_send(UARTDriver *uartp, size_t n, const void *txbuf) {
/* TX DMA channel preparation and start.*/
dmaStreamSetMemory0(uartp->dmatx, txbuf);
dmaStreamSetTransactionSize(uartp->dmatx, n);
dmaStreamSetMode(uartp->dmatx, uartp->dmamode | STM32_DMA_CR_DIR_M2P |
STM32_DMA_CR_MINC | STM32_DMA_CR_TCIE);
dmaStreamEnable(uartp->dmatx);
}
/**
* @brief Stops any ongoing transmission.
* @note Stopping a transmission also suppresses the transmission callbacks.
*
* @param[in] uartp pointer to the @p UARTDriver object
*
* @return The number of data frames not transmitted by the
* stopped transmit operation.
*
* @notapi
*/
size_t uart_lld_stop_send(UARTDriver *uartp) {
dmaStreamDisable(uartp->dmatx);
return dmaStreamGetTransactionSize(uartp->dmatx);
}
/**
* @brief Starts a receive operation on the UART peripheral.
* @note The buffers are organized as uint8_t arrays for data sizes below
* or equal to 8 bits else it is organized as uint16_t arrays.
*
* @param[in] uartp pointer to the @p UARTDriver object
* @param[in] n number of data frames to send
* @param[out] rxbuf the pointer to the receive buffer
*
* @notapi
*/
void uart_lld_start_receive(UARTDriver *uartp, size_t n, void *rxbuf) {
/* Stopping previous activity (idle state).*/
dmaStreamDisable(uartp->dmarx);
/* RX DMA channel preparation and start.*/
dmaStreamSetMemory0(uartp->dmarx, rxbuf);
dmaStreamSetTransactionSize(uartp->dmarx, n);
dmaStreamSetMode(uartp->dmarx, uartp->dmamode | STM32_DMA_CR_DIR_P2M |
STM32_DMA_CR_MINC | STM32_DMA_CR_TCIE);
dmaStreamEnable(uartp->dmarx);
}
/**
* @brief Stops any ongoing receive operation.
* @note Stopping a receive operation also suppresses the receive callbacks.
*
* @param[in] uartp pointer to the @p UARTDriver object
*
* @return The number of data frames not received by the
* stopped receive operation.
*
* @notapi
*/
size_t uart_lld_stop_receive(UARTDriver *uartp) {
size_t n;
dmaStreamDisable(uartp->dmarx);
n = dmaStreamGetTransactionSize(uartp->dmarx);
set_rx_idle_loop(uartp);
return n;
}
#endif /* HAL_USE_UART */
/** @} */
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