/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011 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 HAL_USE_SERIAL || defined(__DOXYGEN__) /*===========================================================================*/ /* Driver exported variables. */ /*===========================================================================*/ /*===========================================================================*/ /* Driver local variables. */ /*===========================================================================*/ /*===========================================================================*/ /* Driver local functions. */ /*===========================================================================*/ /* * Interface implementation, the following functions just invoke the equivalent * queue-level function or macro. */ static size_t writes(void *ip, const uint8_t *bp, size_t n) { return chOQWriteTimeout(&((SerialDriver *)ip)->oqueue, bp, n, TIME_INFINITE); } static size_t reads(void *ip, uint8_t *bp, size_t n) { return chIQReadTimeout(&((SerialDriver *)ip)->iqueue, bp, n, TIME_INFINITE); } static bool_t putwouldblock(void *ip) { return chOQIsFullI(&((SerialDriver *)ip)->oqueue); } static bool_t getwouldblock(void *ip) { return chIQIsEmptyI(&((SerialDriver *)ip)->iqueue); } static msg_t putt(void *ip, uint8_t b, systime_t timeout) { return chOQPutTimeout(&((SerialDriver *)ip)->oqueue, b, timeout); } static msg_t gett(void *ip, systime_t timeout) { return chIQGetTimeout(&((SerialDriver *)ip)->iqueue, timeout); } static size_t writet(void *ip, const uint8_t *bp, size_t n, systime_t time) { return chOQWriteTimeout(&((SerialDriver *)ip)->oqueue, bp, n, time); } static size_t readt(void *ip, uint8_t *bp, size_t n, systime_t time) { return chIQReadTimeout(&((SerialDriver *)ip)->iqueue, bp, n, time); } static ioflags_t getflags(void *ip) { _ch_get_and_clear_flags_impl(ip); } static const struct SerialDriverVMT vmt = { writes, reads, putwouldblock, getwouldblock, putt, gett, writet, readt, getflags }; /*===========================================================================*/ /* 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; chEvtInit(&sdp->event); sdp->flags = IO_NO_ERROR; sdp->state = SD_STOP; chIQInit(&sdp->iqueue, sdp->ib, SERIAL_BUFFERS_SIZE, inotify); chOQInit(&sdp->oqueue, sdp->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. * * @api */ void sdStart(SerialDriver *sdp, const SerialConfig *config) { chDbgCheck(sdp != NULL, "sdStart"); chSysLock(); chDbgAssert((sdp->state == SD_STOP) || (sdp->state == SD_READY), "sdStart(), #1", "invalid state"); sd_lld_start(sdp, config); sdp->state = SD_READY; 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 SerialDriver object * * @api */ void sdStop(SerialDriver *sdp) { chDbgCheck(sdp != NULL, "sdStop"); chSysLock(); chDbgAssert((sdp->state == SD_STOP) || (sdp->state == SD_READY), "sdStop(), #1", "invalid state"); sd_lld_stop(sdp); sdp->state = SD_STOP; chOQResetI(&sdp->oqueue); chIQResetI(&sdp->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. * @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) { chDbgCheck(sdp != NULL, "sdIncomingDataI"); if (chIQIsEmptyI(&sdp->iqueue)) chIOAddFlagsI(sdp, IO_INPUT_AVAILABLE); if (chIQPutI(&sdp->iqueue, b) < Q_OK) chIOAddFlagsI(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; chDbgCheck(sdp != NULL, "sdRequestDataI"); b = chOQGetI(&sdp->oqueue); if (b < Q_OK) chIOAddFlagsI(sdp, IO_OUTPUT_EMPTY); return b; } #endif /* HAL_USE_SERIAL */ /** @} */