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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-08-12 16:55:13 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2013-08-12 16:55:13 +0000 |
| commit | 782415628b7da8871b1ab0d6adfcd0ec325cf485 (patch) | |
| tree | 939bb55430dea5b1036eaf5a4396b8042f1f374e /os/hal/src/uart.c | |
| parent | 60c6d531d4b6b5c5d3d78c4337d267d3fe315c7c (diff) | |
| download | ChibiOS-782415628b7da8871b1ab0d6adfcd0ec325cf485.tar.gz ChibiOS-782415628b7da8871b1ab0d6adfcd0ec325cf485.tar.bz2 ChibiOS-782415628b7da8871b1ab0d6adfcd0ec325cf485.zip | |
Ported UART.
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/kernel_3_dev@6146 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/src/uart.c')
| -rw-r--r-- | os/hal/src/uart.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/os/hal/src/uart.c b/os/hal/src/uart.c new file mode 100644 index 000000000..a25b594aa --- /dev/null +++ b/os/hal/src/uart.c @@ -0,0 +1,338 @@ +/*
+ ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+ 2011,2012,2013 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 uart.c
+ * @brief UART Driver code.
+ *
+ * @addtogroup UART
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_UART || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions. */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions. */
+/*===========================================================================*/
+
+/**
+ * @brief UART Driver initialization.
+ * @note This function is implicitly invoked by @p halInit(), there is
+ * no need to explicitly initialize the driver.
+ *
+ * @init
+ */
+void uartInit(void) {
+
+ uart_lld_init();
+}
+
+/**
+ * @brief Initializes the standard part of a @p UARTDriver structure.
+ *
+ * @param[out] uartp pointer to the @p UARTDriver object
+ *
+ * @init
+ */
+void uartObjectInit(UARTDriver *uartp) {
+
+ uartp->state = UART_STOP;
+ uartp->txstate = UART_TX_IDLE;
+ uartp->rxstate = UART_RX_IDLE;
+ uartp->config = NULL;
+ /* Optional, user-defined initializer.*/
+#if defined(UART_DRIVER_EXT_INIT_HOOK)
+ UART_DRIVER_EXT_INIT_HOOK(uartp);
+#endif
+}
+
+/**
+ * @brief Configures and activates the UART peripheral.
+ *
+ * @param[in] uartp pointer to the @p UARTDriver object
+ * @param[in] config pointer to the @p UARTConfig object
+ *
+ * @api
+ */
+void uartStart(UARTDriver *uartp, const UARTConfig *config) {
+
+ osalDbgCheck((uartp != NULL) && (config != NULL));
+
+ osalSysLock();
+ osalDbgAssert((uartp->state == UART_STOP) || (uartp->state == UART_READY),
+ "invalid state");
+
+ uartp->config = config;
+ uart_lld_start(uartp);
+ uartp->state = UART_READY;
+ osalSysUnlock();
+}
+
+/**
+ * @brief Deactivates the UART peripheral.
+ *
+ * @param[in] uartp pointer to the @p UARTDriver object
+ *
+ * @api
+ */
+void uartStop(UARTDriver *uartp) {
+
+ osalDbgCheck(uartp != NULL);
+
+ osalSysLock();
+ osalDbgAssert((uartp->state == UART_STOP) || (uartp->state == UART_READY),
+ "invalid state");
+
+ uart_lld_stop(uartp);
+ uartp->state = UART_STOP;
+ uartp->txstate = UART_TX_IDLE;
+ uartp->rxstate = UART_RX_IDLE;
+ osalSysUnlock();
+}
+
+/**
+ * @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
+ *
+ * @api
+ */
+void uartStartSend(UARTDriver *uartp, size_t n, const void *txbuf) {
+
+ osalDbgCheck((uartp != NULL) && (n > 0) && (txbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(uartp->state == UART_READY, "is active");
+ osalDbgAssert(uartp->txstate != UART_TX_ACTIVE, "tx active");
+
+ uart_lld_start_send(uartp, n, txbuf);
+ uartp->txstate = UART_TX_ACTIVE;
+ osalSysUnlock();
+}
+
+/**
+ * @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.
+ * @note This function has to be invoked from a lock zone.
+ *
+ * @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
+ *
+ * @iclass
+ */
+void uartStartSendI(UARTDriver *uartp, size_t n, const void *txbuf) {
+
+ osalDbgCheckClassI();
+ osalDbgCheck((uartp != NULL) && (n > 0) && (txbuf != NULL));
+ osalDbgAssert(uartp->state == UART_READY, "is active");
+ osalDbgAssert(uartp->txstate != UART_TX_ACTIVE, "tx active");
+
+ uart_lld_start_send(uartp, n, txbuf);
+ uartp->txstate = UART_TX_ACTIVE;
+}
+
+/**
+ * @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.
+ * @retval 0 There was no transmit operation in progress.
+ *
+ * @api
+ */
+size_t uartStopSend(UARTDriver *uartp) {
+ size_t n;
+
+ osalDbgCheck(uartp != NULL);
+
+ osalSysLock();
+ osalDbgAssert(uartp->state == UART_READY, "not active");
+
+ if (uartp->txstate == UART_TX_ACTIVE) {
+ n = uart_lld_stop_send(uartp);
+ uartp->txstate = UART_TX_IDLE;
+ }
+ else
+ n = 0;
+ osalSysUnlock();
+ return n;
+}
+
+/**
+ * @brief Stops any ongoing transmission.
+ * @note Stopping a transmission also suppresses the transmission callbacks.
+ * @note This function has to be invoked from a lock zone.
+ *
+ * @param[in] uartp pointer to the @p UARTDriver object
+ *
+ * @return The number of data frames not transmitted by the
+ * stopped transmit operation.
+ * @retval 0 There was no transmit operation in progress.
+ *
+ * @iclass
+ */
+size_t uartStopSendI(UARTDriver *uartp) {
+
+ osalDbgCheckClassI();
+ osalDbgCheck(uartp != NULL);
+ osalDbgAssert(uartp->state == UART_READY, "not active");
+
+ if (uartp->txstate == UART_TX_ACTIVE) {
+ size_t n = uart_lld_stop_send(uartp);
+ uartp->txstate = UART_TX_IDLE;
+ return n;
+ }
+ return 0;
+}
+
+/**
+ * @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[in] rxbuf the pointer to the receive buffer
+ *
+ * @api
+ */
+void uartStartReceive(UARTDriver *uartp, size_t n, void *rxbuf) {
+
+ osalDbgCheck((uartp != NULL) && (n > 0) && (rxbuf != NULL));
+
+ osalSysLock();
+ osalDbgAssert(uartp->state == UART_READY, "is active");
+ osalDbgAssert(uartp->rxstate != UART_RX_ACTIVE, "rx active");
+
+ uart_lld_start_receive(uartp, n, rxbuf);
+ uartp->rxstate = UART_RX_ACTIVE;
+ osalSysUnlock();
+}
+
+/**
+ * @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.
+ * @note This function has to be invoked from a lock zone.
+ *
+ * @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
+ *
+ * @iclass
+ */
+void uartStartReceiveI(UARTDriver *uartp, size_t n, void *rxbuf) {
+
+ osalDbgCheckClassI();
+ osalDbgCheck((uartp != NULL) && (n > 0) && (rxbuf != NULL));
+ osalDbgAssert(uartp->state == UART_READY, "is active");
+ osalDbgAssert(uartp->rxstate != UART_RX_ACTIVE, "rx active");
+
+ uart_lld_start_receive(uartp, n, rxbuf);
+ uartp->rxstate = UART_RX_ACTIVE;
+}
+
+/**
+ * @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.
+ * @retval 0 There was no receive operation in progress.
+ *
+ * @api
+ */
+size_t uartStopReceive(UARTDriver *uartp) {
+ size_t n;
+
+ osalDbgCheck(uartp != NULL);
+
+ osalSysLock();
+ osalDbgAssert(uartp->state == UART_READY, "not active");
+
+ if (uartp->rxstate == UART_RX_ACTIVE) {
+ n = uart_lld_stop_receive(uartp);
+ uartp->rxstate = UART_RX_IDLE;
+ }
+ else
+ n = 0;
+ osalSysUnlock();
+ return n;
+}
+
+/**
+ * @brief Stops any ongoing receive operation.
+ * @note Stopping a receive operation also suppresses the receive callbacks.
+ * @note This function has to be invoked from a lock zone.
+ *
+ * @param[in] uartp pointer to the @p UARTDriver object
+ *
+ * @return The number of data frames not received by the
+ * stopped receive operation.
+ * @retval 0 There was no receive operation in progress.
+ *
+ * @iclass
+ */
+size_t uartStopReceiveI(UARTDriver *uartp) {
+
+ osalDbgCheckClassI();
+ osalDbgCheck(uartp != NULL);
+ osalDbgAssert(uartp->state == UART_READY, "not active");
+
+ if (uartp->rxstate == UART_RX_ACTIVE) {
+ size_t n = uart_lld_stop_receive(uartp);
+ uartp->rxstate = UART_RX_IDLE;
+ return n;
+ }
+ return 0;
+}
+
+#endif /* HAL_USE_UART */
+
+/** @} */
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