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/*
ChibiOS/RT - Copyright (C) 2006-2007 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 chserial.c
* @brief Serial Drivers code.
* @addtogroup Serial
* @{
*/
#include <ch.h>
#if CH_USE_SERIAL_FULLDUPLEX
/**
* @brief Initializes a generic full duplex driver.
* @details The HW dependent part of the initialization has to be performed
* outside, usually in the hardware initialization code.
*
* @param[out] sd pointer to a @p FullDuplexDriver structure
* @param[in] ib pointer to a memory area allocated for the Input Queue buffer
* @param[in] isize size of the Input Queue buffer
* @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] ob pointer to a memory area allocated for the Output Queue buffer
* @param[in] osize size of the Output Queue buffer
* @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.
*/
void chFDDInit(FullDuplexDriver *sd,
uint8_t *ib, size_t isize, qnotify_t inotify,
uint8_t *ob, size_t osize, qnotify_t onotify) {
chDbgCheck((sd != NULL) && (ib != NULL) && (ob != NULL) &&
(isize > 0) && (osize > 0), "chFDDInit");
chIQInit(&sd->sd_iqueue, ib, isize, inotify);
chEvtInit(&sd->sd_ievent);
chOQInit(&sd->sd_oqueue, ob, osize, onotify);
chEvtInit(&sd->sd_oevent);
chEvtInit(&sd->sd_sevent);
sd->sd_flags = SD_NO_ERROR;
}
/**
* @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.
* @param[in] sd pointer to a @p FullDuplexDriver structure
* @param[in] b the byte to be written in the driver's Input Queue
*/
void chFDDIncomingDataI(FullDuplexDriver *sd, uint8_t b) {
if (chIQPutI(&sd->sd_iqueue, b) < Q_OK)
chFDDAddFlagsI(sd, SD_OVERRUN_ERROR);
else
chEvtBroadcastI(&sd->sd_ievent);
}
/**
* @brief Handles outgoing data.
* @details Must be called from the output interrupt service routine in order
* to get the next byte to be transmitted.
*
* @param[in] sd pointer to a @p FullDuplexDriver 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).
*/
msg_t chFDDRequestDataI(FullDuplexDriver *sd) {
msg_t b = chOQGetI(&sd->sd_oqueue);
if (b < Q_OK)
chEvtBroadcastI(&sd->sd_oevent);
return b;
}
/**
* @brief Handles communication events/errors.
* @details Must be called from the I/O interrupt service routine in order to
* notify I/O conditions as errors, signals change etc.
*
* @param[in] sd pointer to a @p FullDuplexDriver structure
* @param[in] mask condition flags to be added to the mask
*/
void chFDDAddFlagsI(FullDuplexDriver *sd, dflags_t mask) {
sd->sd_flags |= mask;
chEvtBroadcastI(&sd->sd_sevent);
}
/**
* @brief Returns and clears the errors mask associated to the driver.
*
* @param[in] sd pointer to a @p FullDuplexDriver structure
* @return The condition flags modified since last time this function was
* invoked.
*/
dflags_t chFDDGetAndClearFlags(FullDuplexDriver *sd) {
dflags_t mask;
mask = sd->sd_flags;
sd->sd_flags = SD_NO_ERROR;
return mask;
}
#endif /* CH_USE_SERIAL_FULLDUPLEX */
/** @} */
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