/*
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 .
*/
/**
* @file serial.c
* @brief Serial Driver code.
* @addtogroup SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_SERIAL || defined(__DOXYGEN__)
/*
* Interface implementation, the following functions just invoke the equivalent
* queue-level function or macro.
*/
static bool_t putwouldblock(void *ip) {
return chOQIsFull(&((SerialDriver *)ip)->d2.oqueue);
}
static bool_t getwouldblock(void *ip) {
return chIQIsEmpty(&((SerialDriver *)ip)->d2.iqueue);
}
static msg_t put(void *ip, uint8_t b, systime_t timeout) {
return chOQPutTimeout(&((SerialDriver *)ip)->d2.oqueue, b, timeout);
}
static msg_t get(void *ip, systime_t timeout) {
return chIQGetTimeout(&((SerialDriver *)ip)->d2.iqueue, timeout);
}
static size_t write(void *ip, uint8_t *buffer, size_t n) {
return chOQWrite(&((SerialDriver *)ip)->d2.oqueue, buffer, n);
}
static size_t read(void *ip, uint8_t *buffer, size_t n) {
return chIQRead(&((SerialDriver *)ip)->d2.iqueue, buffer, n);
}
static const struct SerialDriverVMT vmt = {
{putwouldblock, getwouldblock, put, get},
{write, read},
{}
};
/**
* @brief Serial Driver initialization.
*/
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.
*/
void sdObjectInit(SerialDriver *sdp, qnotify_t inotify, qnotify_t onotify) {
sdp->vmt = &vmt;
chEvtInit(&sdp->d1.ievent);
chEvtInit(&sdp->d1.oevent);
chEvtInit(&sdp->d2.sevent);
sdp->d2.flags = SD_NO_ERROR;
chIQInit(&sdp->d2.iqueue, sdp->d2.ib, SERIAL_BUFFERS_SIZE, inotify);
chOQInit(&sdp->d2.oqueue, sdp->d2.ob, SERIAL_BUFFERS_SIZE, onotify);
}
/**
* @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.
*/
void sdStart(SerialDriver *sdp, const SerialDriverConfig *config) {
chSysLock();
sd_lld_start(sdp, config);
chSysUnlock();
}
/**
* @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 SerialDrive object
*/
void sdStop(SerialDriver *sdp) {
chSysLock();
sd_lld_stop(sdp);
chOQResetI(&sdp->d2.oqueue);
chIQResetI(&sdp->d2.iqueue);
chSchRescheduleS();
chSysUnlock();
}
/**
* @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 SerialDriver structure
* @param[in] b the byte to be written in the driver's Input Queue
*/
void sdIncomingDataI(SerialDriver *sd, uint8_t b) {
if (chIQPutI(&sd->d2.iqueue, b) < Q_OK)
sdAddFlagsI(sd, SD_OVERRUN_ERROR);
else
chEvtBroadcastI(&sd->d1.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 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).
*/
msg_t sdRequestDataI(SerialDriver *sd) {
msg_t b = chOQGetI(&sd->d2.oqueue);
if (b < Q_OK)
chEvtBroadcastI(&sd->d1.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 SerialDriver structure
* @param[in] mask condition flags to be added to the mask
*/
void sdAddFlagsI(SerialDriver *sd, sdflags_t mask) {
sd->d2.flags |= mask;
chEvtBroadcastI(&sd->d2.sevent);
}
/**
* @brief Returns and clears the errors mask associated to the driver.
*
* @param[in] sd pointer to a @p SerialDriver structure
* @return The condition flags modified since last time this function was
* invoked.
*/
sdflags_t sdGetAndClearFlags(SerialDriver *sd) {
sdflags_t mask;
mask = sd->d2.flags;
sd->d2.flags = SD_NO_ERROR;
return mask;
}
#endif /* CH_HAL_USE_SERIAL */
/** @} */
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