uart.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file uart.c
* @brief UART Driver code.
*
* @addtogroup UART
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_UART || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* 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) {
chDbgCheck((uartp != NULL) && (config != NULL), "uartStart");
chSysLock();
chDbgAssert((uartp->state == UART_STOP) || (uartp->state == UART_READY),
"uartStart(), #1", "invalid state");
uartp->config = config;
uart_lld_start(uartp);
uartp->state = UART_READY;
chSysUnlock();
}
/**
* @brief Deactivates the UART peripheral.
*
* @param[in] uartp pointer to the @p UARTDriver object
*
* @api
*/
void uartStop(UARTDriver *uartp) {
chDbgCheck(uartp != NULL, "uartStop");
chSysLock();
chDbgAssert((uartp->state == UART_STOP) || (uartp->state == UART_READY),
"uartStop(), #1", "invalid state");
uart_lld_stop(uartp);
uartp->state = UART_STOP;
uartp->txstate = UART_TX_IDLE;
uartp->rxstate = UART_RX_IDLE;
chSysUnlock();
}
/**
* @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) {
chDbgCheck((uartp != NULL) && (n > 0) && (txbuf != NULL),
"uartStartSend");
chSysLock();
chDbgAssert((uartp->state == UART_READY) && (uartp->txstate == UART_TX_IDLE),
"uartStartSend(), #1", "not active");
uart_lld_start_send(uartp, n, txbuf);
uartp->txstate = UART_TX_ACTIVE;
chSysUnlock();
}
/**
* @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) {
chDbgCheckClassI();
chDbgCheck((uartp != NULL) && (n > 0) && (txbuf != NULL),
"uartStartSendI");
chDbgAssert((uartp->state == UART_READY) &&
(uartp->txstate != UART_TX_ACTIVE),
"uartStartSendI(), #1", "not 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;
chDbgCheck(uartp != NULL, "uartStopSend");
chSysLock();
chDbgAssert(uartp->state == UART_READY, "uartStopSend(), #1", "not active");
if (uartp->txstate == UART_TX_ACTIVE) {
n = uart_lld_stop_send(uartp);
uartp->txstate = UART_TX_IDLE;
}
else
n = 0;
chSysUnlock();
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) {
chDbgCheckClassI();
chDbgCheck(uartp != NULL, "uartStopSendI");
chDbgAssert(uartp->state == UART_READY, "uartStopSendI(), #1", "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) {
chDbgCheck((uartp != NULL) && (n > 0) && (rxbuf != NULL),
"uartStartReceive");
chSysLock();
chDbgAssert((uartp->state == UART_READY) && (uartp->rxstate == UART_RX_IDLE),
"uartStartReceive(), #1", "not active");
uart_lld_start_receive(uartp, n, rxbuf);
uartp->rxstate = UART_RX_ACTIVE;
chSysUnlock();
}
/**
* @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) {
chDbgCheckClassI();
chDbgCheck((uartp != NULL) && (n > 0) && (rxbuf != NULL),
"uartStartReceiveI");
chDbgAssert((uartp->state == UART_READY) && (uartp->rxstate == UART_RX_IDLE),
"uartStartReceiveI(), #1", "not 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;
chDbgCheck(uartp != NULL, "uartStopReceive");
chSysLock();
chDbgAssert(uartp->state == UART_READY,
"uartStopReceive(), #1", "not active");
if (uartp->rxstate == UART_RX_ACTIVE) {
n = uart_lld_stop_receive(uartp);
uartp->rxstate = UART_RX_IDLE;
}
else
n = 0;
chSysUnlock();
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) {
chDbgCheckClassI();
chDbgCheck(uartp != NULL, "uartStopReceiveI");
chDbgAssert(uartp->state == UART_READY,
"uartStopReceiveI(), #1", "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 */
/** @} */