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/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file serial.c
* @brief Serial Driver code.
*
* @addtogroup SERIAL
* @{
*/
#include "hal.h"
#if (HAL_USE_SERIAL == TRUE) || 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 timeout) {
return oqWriteTimeout(&((SerialDriver *)ip)->oqueue, bp, n, timeout);
}
static size_t readt(void *ip, uint8_t *bp, size_t n, systime_t timeout) {
return iqReadTimeout(&((SerialDriver *)ip)->iqueue, bp, n, timeout);
}
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 MSG_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) < MSG_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 MSG_TIMEOUT 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 < MSG_OK)
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
return b;
}
/**
* @brief Direct output check on a @p SerialDriver.
* @note This function bypasses the indirect access to the channel and
* checks directly the output queue. This is faster but cannot
* be used to check different channels implementations.
*
* @param[in] sdp pointer to a @p SerialDriver structure
* @return The queue status.
* @retval false if the next write operation would not block.
* @retval true if the next write operation would block.
*
* @deprecated
*
* @api
*/
bool sdPutWouldBlock(SerialDriver *sdp) {
bool b;
osalSysLock();
b = oqIsFullI(&sdp->oqueue);
osalSysUnlock();
return b;
}
/**
* @brief Direct input check on a @p SerialDriver.
* @note This function bypasses the indirect access to the channel and
* checks directly the input queue. This is faster but cannot
* be used to check different channels implementations.
*
* @param[in] sdp pointer to a @p SerialDriver structure
* @return The queue status.
* @retval false if the next write operation would not block.
* @retval true if the next write operation would block.
*
* @deprecated
*
* @api
*/
bool sdGetWouldBlock(SerialDriver *sdp) {
bool b;
osalSysLock();
b = iqIsEmptyI(&sdp->iqueue);
osalSysUnlock();
return b;
}
#endif /* HAL_USE_SERIAL == TRUE */
/** @} */
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