diff options
Diffstat (limited to 'os/hal/platforms/STM8L/serial_lld.c')
| -rw-r--r-- | os/hal/platforms/STM8L/serial_lld.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/os/hal/platforms/STM8L/serial_lld.c b/os/hal/platforms/STM8L/serial_lld.c new file mode 100644 index 000000000..dcb99643a --- /dev/null +++ b/os/hal/platforms/STM8L/serial_lld.c @@ -0,0 +1,230 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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 STM8L/serial_lld.c
+ * @brief STM8L low level serial driver code.
+ *
+ * @addtogroup SERIAL
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#if HAL_USE_SERIAL || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/**
+ * @brief USART1 serial driver identifier.
+ */
+#if STM8L_SERIAL_USE_USART1 || defined(__DOXYGEN__)
+SerialDriver SD1;
+#endif
+
+/**
+ * @brief USART2 serial driver identifier.
+ */
+#if STM8L_SERIAL_USE_USART2 || defined(__DOXYGEN__)
+SerialDriver SD2;
+#endif
+
+/**
+ * @brief USART3 serial driver identifier.
+ */
+#if STM8L_SERIAL_USE_USART3 || defined(__DOXYGEN__)
+SerialDriver SD3;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables. */
+/*===========================================================================*/
+
+/**
+ * @brief Driver default configuration.
+ */
+static ROMCONST SerialConfig default_config = {
+ BBR(SERIAL_DEFAULT_BITRATE),
+ SD_MODE_PARITY_NONE | SD_MODE_STOP_1
+};
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/**
+ * @brief USART initialization.
+ *
+ * @param[in] config architecture-dependent serial driver configuration
+ * @param[in] sdp pointer to a @p SerialDriver object
+ */
+static void usart_init(SerialDriver *sdp, const SerialConfig *config) {
+ USART_TypeDef *u = sdp->usart;
+
+ u->BRR2 = (uint8_t)(((uint8_t)(config->sc_brr >> 8) & (uint8_t)0xF0) |
+ ((uint8_t)config->sc_brr & (uint8_t)0x0F));
+ u->BRR1 = (uint8_t)(config->sc_brr >> 4);
+ u->CR1 = (uint8_t)(config->sc_mode & SD_MODE_PARITY);
+ u->CR2 = USART_CR2_RIEN | USART_CR2_TEN | USART_CR2_REN;
+ u->CR3 = (uint8_t)(config->sc_mode & SD_MODE_STOP);
+ u->CR4 = 0;
+ u->CR5 = 0;
+ u->PSCR = 1;
+ (void)u->SR;
+ (void)u->DR;
+}
+
+/**
+ * @brief USART de-initialization.
+ *
+ * @param[in] sdp pointer to a @p SerialDriver object
+ */
+static void usart_deinit(SerialDriver *sdp) {
+ USART_TypeDef *u = sdp->usart;
+
+ u->CR1 = USART_CR1_USARTD;
+ u->CR2 = 0;
+ u->CR3 = 0;
+ u->CR4 = 0;
+ u->CR5 = 0;
+ u->PSCR = 0;
+}
+
+#if STM8L_SERIAL_USE_USART1 || defined(__DOXYGEN__)
+static void notify1(void) {
+
+ USART1->CR2 |= USART_CR2_TIEN;
+}
+#endif /* STM8L_SERIAL_USE_USART1 */
+
+#if STM8L_SERIAL_USE_USART2 || defined(__DOXYGEN__)
+static void notify2(void) {
+
+ USART2->CR2 |= USART_CR2_TIEN;
+}
+#endif /* STM8L_SERIAL_USE_USART1 */
+
+#if STM8L_SERIAL_USE_USART3 || defined(__DOXYGEN__)
+static void notify3(void) {
+
+ USART3->CR2 |= USART_CR2_TIEN;
+}
+#endif /* STM8L_SERIAL_USE_USART3 */
+
+/*===========================================================================*/
+/* Driver interrupt handlers. */
+/*===========================================================================*/
+
+/* See in serial_lld.h.*/
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief Error handling routine.
+ *
+ * @param[in] sdp pointer to a @p SerialDriver object
+ * @param[in] sr USART SR register value
+ *
+ * @notapi
+ */
+void sd_lld_set_error(SerialDriver *sdp, uint8_t sr) {
+ sdflags_t sts = 0;
+
+ if (sr & USART_SR_OR)
+ sts |= SD_OVERRUN_ERROR;
+ if (sr & USART_SR_NF)
+ sts |= SD_NOISE_ERROR;
+ if (sr & USART_SR_FE)
+ sts |= SD_FRAMING_ERROR;
+ if (sr & USART_SR_PE)
+ sts |= SD_PARITY_ERROR;
+ chSysLockFromIsr();
+ sdAddFlagsI(sdp, sts);
+ chSysUnlockFromIsr();
+}
+
+/**
+ * @brief Low level serial driver initialization.
+ *
+ * @notapi
+ */
+void sd_lld_init(void) {
+
+#if STM8L_SERIAL_USE_USART1
+ sdObjectInit(&SD1, NULL, notify1);
+ CLK->PCKENR1 |= CLK_PCKENR1_USART1; /* PCKEN12, clock source. */
+ USART1->CR1 = USART_CR1_USARTD; /* USARTD (low power). */
+ SD1.usart = USART1;
+#endif
+
+#if STM8L_SERIAL_USE_USART2
+ sdObjectInit(&SD2, NULL, notify2);
+ CLK->PCKENR1 |= CLK_PCKENR1_USART2; /* PCKEN13, clock source. */
+ USART2->CR1 = USART2_CR1_USARTD; /* USARTD (low power). */
+ SD1.usart = USART2;
+#endif
+
+#if STM8L_SERIAL_USE_USART3
+ sdObjectInit(&SD3, NULL, notify3);
+ CLK->PCKENR1 |= CLK_PCKENR1_USART3; /* PCKEN13, clock source. */
+ USART3->CR1 = USART3_CR1_USARTD; /* USARTD (low power). */
+ SD1.usart = USART3;
+#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;
+
+ 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) {
+
+ usart_deinit(sdp);
+}
+
+#endif /* HAL_USE_SERIAL */
+
+/** @} */
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