diff options
Diffstat (limited to 'os/hal/platforms/STM32/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/STM32/serial_lld.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/os/hal/platforms/STM32/serial_lld.c b/os/hal/platforms/STM32/serial_lld.c new file mode 100644 index 000000000..5337c4dfa --- /dev/null +++ b/os/hal/platforms/STM32/serial_lld.c @@ -0,0 +1,305 @@ +/*
+ 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
+
+#if USE_STM32_USART1 || defined(__DOXYGEN__)
+/** @brief USART1 serial driver identifier.*/
+SerialDriver SD1;
+#endif
+
+#if USE_STM32_USART2 || defined(__DOXYGEN__)
+/** @brief USART2 serial driver identifier.*/
+SerialDriver SD2;
+#endif
+
+#if USE_STM32_USART3 || defined(__DOXYGEN__)
+/** @brief USART3 serial driver identifier.*/
+SerialDriver SD3;
+#endif
+
+/** @brief Driver default configuration.*/
+static const SerialDriverConfig default_config =
+{
+ 38400,
+ 0,
+ USART_CR2_STOP1_BITS | USART_CR2_LINEN,
+ 0
+};
+
+/*===========================================================================*/
+/* Low Level Driver local functions. */
+/*===========================================================================*/
+
+/**
+ * @brief USART initialization.
+ * @details This function must be invoked with interrupts disabled.
+ *
+ * @param[in] u pointer to an USART I/O block
+ * @param[in] config the architecture-dependent serial driver configuration
+ */
+static void usart_init(USART_TypeDef *u, const SerialDriverConfig *config) {
+
+ /*
+ * Baud rate setting.
+ */
+ if (u == USART1)
+ u->BRR = APB2CLK / config->speed;
+ else
+ u->BRR = APB1CLK / config->speed;
+
+ /*
+ * Note that some bits are enforced.
+ */
+ u->CR1 = config->cr1 | USART_CR1_UE | USART_CR1_PEIE | USART_CR1_RXNEIE |
+ USART_CR1_TE | USART_CR1_RE;
+ u->CR2 = config->cr2;
+ u->CR3 = config->cr3 | USART_CR3_EIE;
+}
+
+/**
+ * @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] sr USART SR register value
+ * @param[in] com communication channel associated to the USART
+ */
+static void set_error(uint16_t sr, SerialDriver *sdp) {
+ 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_LBD)
+ sts |= SD_BREAK_DETECTED;
+ chSysLockFromIsr();
+ sdAddFlagsI(sdp, sts);
+ chSysUnlockFromIsr();
+}
+
+/**
+ * @brief Common IRQ handler.
+ * @param[in] u pointer to an USART I/O block
+ * @param[in] com communication channel associated to the USART
+ */
+static void serve_interrupt(USART_TypeDef *u, SerialDriver *sdp) {
+ uint16_t sr = u->SR;
+
+ if (sr & (USART_SR_ORE | USART_SR_FE | USART_SR_PE | USART_SR_LBD))
+ set_error(sr, sdp);
+ if (sr & USART_SR_RXNE) {
+ chSysLockFromIsr();
+ sdIncomingDataI(sdp, u->DR);
+ chSysUnlockFromIsr();
+ }
+ if (sr & USART_SR_TXE) {
+ chSysLockFromIsr();
+ msg_t b = sdRequestDataI(sdp);
+ chSysUnlockFromIsr();
+ if (b < Q_OK)
+ u->CR1 &= ~USART_CR1_TXEIE;
+ else
+ u->DR = b;
+ }
+}
+
+#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
+
+/*===========================================================================*/
+/* Low Level Driver interrupt handlers. */
+/*===========================================================================*/
+
+#if USE_STM32_USART1 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(VectorD4) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt(USART1, &SD1);
+
+ CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if USE_STM32_USART2 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(VectorD8) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt(USART2, &SD2);
+
+ CH_IRQ_EPILOGUE();
+}
+#endif
+
+#if USE_STM32_USART3 || defined(__DOXYGEN__)
+CH_IRQ_HANDLER(VectorDC) {
+
+ CH_IRQ_PROLOGUE();
+
+ serve_interrupt(USART3, &SD3);
+
+ CH_IRQ_EPILOGUE();
+}
+#endif
+
+/*===========================================================================*/
+/* Low Level Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * Low level serial driver initialization. + */
+void sd_lld_init(void) {
+
+#if USE_STM32_USART1
+ sdObjectInit(&SD1, NULL, notify1);
+ GPIOA->CRH = (GPIOA->CRH & 0xFFFFF00F) | 0x000004B0;
+#endif
+
+#if USE_STM32_USART2
+ sdObjectInit(&SD2, NULL, notify2);
+ GPIOA->CRL = (GPIOA->CRL & 0xFFFF00FF) | 0x00004B00;
+#endif
+
+#if USE_STM32_USART3
+ sdObjectInit(&SD3, NULL, notify3);
+ GPIOB->CRH = (GPIOB->CRH & 0xFFFF00FF) | 0x00004B00;
+#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.
+ */
+void sd_lld_start(SerialDriver *sdp, const SerialDriverConfig *config) {
+
+ if (config == NULL)
+ config = &default_config;
+
+#if USE_STM32_USART1
+ if (&SD1 == sdp) {
+ RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
+ usart_init(USART1, config);
+ NVICEnableVector(USART1_IRQn, STM32_USART1_PRIORITY);
+ return;
+ }
+#endif
+#if USE_STM32_USART2
+ if (&SD2 == sdp) {
+ RCC->APB1ENR |= RCC_APB1ENR_USART2EN;
+ usart_init(USART2, config);
+ NVICEnableVector(USART2_IRQn, STM32_USART2_PRIORITY);
+ return;
+ }
+#endif
+#if USE_STM32_USART3
+ if (&SD3 == sdp) {
+ RCC->APB1ENR |= RCC_APB1ENR_USART3EN;
+ usart_init(USART3, config);
+ NVICEnableVector(USART3_IRQn, STM32_USART3_PRIORITY);
+ 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
+ */
+void sd_lld_stop(SerialDriver *sdp) {
+
+#if USE_STM32_USART1
+ if (&SD1 == sdp) {
+ usart_deinit(USART1);
+ RCC->APB2ENR &= ~RCC_APB2ENR_USART1EN;
+ NVICDisableVector(USART1_IRQn);
+ return;
+ }
+#endif
+#if USE_STM32_USART2
+ if (&SD2 == sdp) {
+ usart_deinit(USART2);
+ RCC->APB1ENR &= ~RCC_APB1ENR_USART2EN;
+ NVICDisableVector(USART2_IRQn);
+ return;
+ }
+#endif
+#if USE_STM32_USART3
+ if (&SD3 == sdp) {
+ usart_deinit(USART3);
+ RCC->APB1ENR &= ~RCC_APB1ENR_USART3EN;
+ NVICDisableVector(USART3_IRQn);
+ return;
+ }
+#endif
+}
+
+#endif /* CH_HAL_USE_SERIAL */
+
+/** @} */
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