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/*
ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS 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 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 serial.c
* @brief Serial Driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "hal.h"
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*
* Interface implementation, the following functions just invoke the equivalent
* queue-level function or macro.
*/
static size_t write(void *ip, const uint8_t *bp, size_t n) {
return oqWriteTimeout(&((SerialDriver *)ip)->oqueue, bp,
n, TIME_INFINITE);
}
static size_t read(void *ip, uint8_t *bp, size_t n) {
return iqReadTimeout(&((SerialDriver *)ip)->iqueue, bp,
n, TIME_INFINITE);
}
static msg_t put(void *ip, uint8_t b) {
return oqPutTimeout(&((SerialDriver *)ip)->oqueue, b, TIME_INFINITE);
}
static msg_t get(void *ip) {
return iqGetTimeout(&((SerialDriver *)ip)->iqueue, TIME_INFINITE);
}
static msg_t putt(void *ip, uint8_t b, systime_t timeout) {
return oqPutTimeout(&((SerialDriver *)ip)->oqueue, b, timeout);
}
static msg_t gett(void *ip, systime_t timeout) {
return iqGetTimeout(&((SerialDriver *)ip)->iqueue, timeout);
}
static size_t writet(void *ip, const uint8_t *bp, size_t n, systime_t time) {
return oqWriteTimeout(&((SerialDriver *)ip)->oqueue, bp, n, time);
}
static size_t readt(void *ip, uint8_t *bp, size_t n, systime_t time) {
return iqReadTimeout(&((SerialDriver *)ip)->iqueue, bp, n, time);
}
static const struct SerialDriverVMT vmt = {
write, read, put, get,
putt, gett, writet, readt
};
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Serial Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void sdInit(void) {
sd_lld_init();
}
/**
* @brief Initializes a generic full duplex driver object.
* @details The HW dependent part of the initialization has to be performed
* outside, usually in the hardware initialization code.
*
* @param[out] sdp pointer to a @p SerialDriver structure
* @param[in] inotify pointer to a callback function that is invoked when
* some data is read from the Queue. The value can be
* @p NULL.
* @param[in] onotify pointer to a callback function that is invoked when
* some data is written in the Queue. The value can be
* @p NULL.
*
* @init
*/
void sdObjectInit(SerialDriver *sdp, qnotify_t inotify, qnotify_t onotify) {
sdp->vmt = &vmt;
osalEventObjectInit(&sdp->event);
sdp->state = SD_STOP;
iqObjectInit(&sdp->iqueue, sdp->ib, SERIAL_BUFFERS_SIZE, inotify, sdp);
oqObjectInit(&sdp->oqueue, sdp->ob, SERIAL_BUFFERS_SIZE, onotify, sdp);
}
/**
* @brief Configures and starts the driver.
*
* @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.
*
* @api
*/
void sdStart(SerialDriver *sdp, const SerialConfig *config) {
osalDbgCheck(sdp != NULL);
osalSysLock();
osalDbgAssert((sdp->state == SD_STOP) || (sdp->state == SD_READY),
"invalid state");
sd_lld_start(sdp, config);
sdp->state = SD_READY;
osalSysUnlock();
}
/**
* @brief Stops the driver.
* @details Any thread waiting on the driver's queues will be awakened with
* the message @p Q_RESET.
*
* @param[in] sdp pointer to a @p SerialDriver object
*
* @api
*/
void sdStop(SerialDriver *sdp) {
osalDbgCheck(sdp != NULL);
osalSysLock();
osalDbgAssert((sdp->state == SD_STOP) || (sdp->state == SD_READY),
"invalid state");
sd_lld_stop(sdp);
sdp->state = SD_STOP;
oqResetI(&sdp->oqueue);
iqResetI(&sdp->iqueue);
osalOsRescheduleS();
osalSysUnlock();
}
/**
* @brief Handles incoming data.
* @details This function must be called from the input interrupt service
* routine in order to enqueue incoming data and generate the
* related events.
* @note The incoming data event is only generated when the input queue
* becomes non-empty.
* @note In order to gain some performance it is suggested to not use
* this function directly but copy this code directly into the
* interrupt service routine.
*
* @param[in] sdp pointer to a @p SerialDriver structure
* @param[in] b the byte to be written in the driver's Input Queue
*
* @iclass
*/
void sdIncomingDataI(SerialDriver *sdp, uint8_t b) {
osalDbgCheckClassI();
osalDbgCheck(sdp != NULL);
if (iqIsEmptyI(&sdp->iqueue))
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
if (iqPutI(&sdp->iqueue, b) < Q_OK)
chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
}
/**
* @brief Handles outgoing data.
* @details Must be called from the output interrupt service routine in order
* to get the next byte to be transmitted.
* @note In order to gain some performance it is suggested to not use
* this function directly but copy this code directly into the
* interrupt service routine.
*
* @param[in] sdp pointer to a @p SerialDriver structure
* @return The byte value read from the driver's output queue.
* @retval Q_EMPTY if the queue is empty (the lower driver usually
* disables the interrupt source when this happens).
*
* @iclass
*/
msg_t sdRequestDataI(SerialDriver *sdp) {
msg_t b;
osalDbgCheckClassI();
osalDbgCheck(sdp != NULL);
b = oqGetI(&sdp->oqueue);
if (b < Q_OK)
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
return b;
}
#endif /* HAL_USE_SERIAL */
/** @} */
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