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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/>.
*/
/**
* @addtogroup Serial
* @{
*/
#include <ch.h>
#ifdef CH_USE_SERIAL_FULLDUPLEX
/**
* Initializes a generic full duplex driver. The HW dependent part of the
* initialization has to be performed outside, usually in the hardware
* initialization code.
* @param sd pointer to a \p FullDuplexDriver structure
* @param ib pointer to a memory area allocated for the Input Queue buffer
* @param isize size of the Input Queue buffer
* @param inotify pointer to a callback function that is invoked when
* some data is read from the Queue. The value can be \p NULL.
* @param ob pointer to a memory area allocated for the Output Queue buffer
* @param osize size of the Output Queue buffer
* @param 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) {
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;
}
/**
* This function must be called from the input interrupt service routine in
* order to enqueue incoming data and generate the related events.
* @param sd pointer to a \p FullDuplexDriver structure
* @param 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
chEvtSendI(&sd->sd_ievent);
}
/**
* Must be called from the output interrupt service routine in order to get
* the next byte to be transmitted.
*
* @param sd pointer to a \p FullDuplexDriver structure
* @return the byte read from the driver's Output Queue or \p 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)
chEvtSendI(&sd->sd_oevent);
return b;
}
/**
* Must be called from the I/O interrupt service routine in order to
* notify I/O conditions as errors, signals change etc.
* @param sd pointer to a \p FullDuplexDriver structure
* @param mask condition flags to be added to the mask
*/
void chFDDAddFlagsI(FullDuplexDriver *sd, dflags_t mask) {
sd->sd_flags |= mask;
chEvtSendI(&sd->sd_sevent);
}
/**
* This function returns and clears the errors mask associated to the driver.
* @param 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 */
#ifdef CH_USE_SERIAL_HALFDUPLEX
/**
* Initializes a generic half duplex driver. The HW dependent part of the
* initialization has to be performed outside, usually in the hardware
* initialization code.
* @param sd pointer to a \p HalfDuplexDriver structure
* @param b pointer to a memory area allocated for the queue buffer
* @param size the buffer size
* @param inotify pointer to a callback function that is invoked when
* some data is read from the queue. The value can be \p NULL.
* @param onotify pointer to a callback function that is invoked when
* some data is written in the queue. The value can be \p NULL.
*/
void chHDDInit(HalfDuplexDriver *sd, uint8_t *b, size_t size,
qnotify_t inotify, qnotify_t onotify) {
chHDQInit(&sd->sd_queue, b, size, inotify, onotify);
chEvtInit(&sd->sd_ievent);
chEvtInit(&sd->sd_oevent);
chEvtInit(&sd->sd_sevent);
sd->sd_flags = SD_NO_ERROR;
}
/**
* This function must be called from the input interrupt service routine in
* order to enqueue incoming data and generate the related events.
* @param sd pointer to a \p FullDuplexDriver structure
* @param b the byte to be written in the driver's Input Queue
*/
void chHDDIncomingDataI(HalfDuplexDriver *sd, uint8_t b) {
if (chHDQPutReceiveI(&sd->sd_queue, b) < Q_OK)
chHDDAddFlagsI(sd, SD_OVERRUN_ERROR);
else
chEvtSendI(&sd->sd_ievent);
}
/**
* Must be called from the output interrupt service routine in order to get
* the next byte to be transmitted.
*
* @param sd pointer to a \p HalfDuplexDriver structure
* @return the byte read from the driver's Output Queue or \p Q_EMPTY if the
* queue is empty (the lower driver usually disables the interrupt
* source when this happens).
*/
msg_t chHDDRequestDataI(HalfDuplexDriver *sd) {
msg_t b = chHDQGetTransmitI(&sd->sd_queue);
if (b < Q_OK)
chEvtSendI(&sd->sd_oevent);
return b;
}
/**
* Must be called from the I/O interrupt service routine in order to
* notify I/O conditions as errors, signals change etc.
* @param sd pointer to a \p HalfDuplexDriver structure
* @param mask condition flags to be added to the mask
*/
void chHDDAddFlagsI(HalfDuplexDriver *sd, dflags_t mask) {
sd->sd_flags |= mask;
chEvtSendI(&sd->sd_sevent);
}
/**
* This function returns and clears the errors mask associated to the driver.
* @param sd pointer to a \p HalfDuplexDriver structure
* @return the condition flags modified since last time this function was
* invoked
*/
dflags_t chHDDGetAndClearFlags(HalfDuplexDriver *sd) {
dflags_t mask;
mask = sd->sd_flags;
sd->sd_flags = SD_NO_ERROR;
return mask;
}
#endif /* CH_USE_SERIAL_HALFDUPLEX */
/** @} */
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