245 lines
6.7 KiB
C
245 lines
6.7 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file gpt.c
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* @brief GPT Driver code.
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*
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* @addtogroup GPT
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_GPT || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief GPT Driver initialization.
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* @note This function is implicitly invoked by @p halInit(), there is
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* no need to explicitly initialize the driver.
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*
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* @init
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*/
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void gptInit(void) {
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gpt_lld_init();
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}
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/**
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* @brief Initializes the standard part of a @p GPTDriver structure.
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*
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* @param[out] gptp pointer to the @p GPTDriver object
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*
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* @init
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*/
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void gptObjectInit(GPTDriver *gptp) {
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gptp->state = GPT_STOP;
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gptp->config = NULL;
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}
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/**
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* @brief Configures and activates the GPT peripheral.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] config pointer to the @p GPTConfig object
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*
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* @api
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*/
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void gptStart(GPTDriver *gptp, const GPTConfig *config) {
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chDbgCheck((gptp != NULL) && (config != NULL), "ptStart");
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chSysLock();
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chDbgAssert((gptp->state == GPT_STOP) || (gptp->state == GPT_READY),
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"gptStart(), #1", "invalid state");
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gptp->config = config;
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gpt_lld_start(gptp);
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gptp->state = GPT_READY;
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chSysUnlock();
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}
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/**
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* @brief Deactivates the GPT peripheral.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @api
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*/
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void gptStop(GPTDriver *gptp) {
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chDbgCheck(gptp != NULL, "gptStop");
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chSysLock();
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chDbgAssert((gptp->state == GPT_STOP) || (gptp->state == GPT_READY),
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"gptStop(), #1", "invalid state");
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gpt_lld_stop(gptp);
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gptp->state = GPT_STOP;
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chSysUnlock();
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}
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/**
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* @brief Starts the timer in continuous mode.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval period in ticks
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*
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* @api
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*/
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void gptStartContinuous(GPTDriver *gptp, gptcnt_t interval) {
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chSysLock();
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gptStartContinuousI(gptp, interval);
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chSysUnlock();
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}
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/**
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* @brief Starts the timer in continuous mode.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval period in ticks
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*
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* @iclass
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*/
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void gptStartContinuousI(GPTDriver *gptp, gptcnt_t interval) {
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chDbgCheckClassI();
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chDbgCheck(gptp != NULL, "gptStartContinuousI");
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chDbgAssert(gptp->state == GPT_READY,
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"gptStartContinuousI(), #1", "invalid state");
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gptp->state = GPT_CONTINUOUS;
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gpt_lld_start_timer(gptp, interval);
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}
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/**
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* @brief Starts the timer in one shot mode.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval time interval in ticks
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*
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* @api
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*/
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void gptStartOneShot(GPTDriver *gptp, gptcnt_t interval) {
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chSysLock();
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gptStartOneShotI(gptp, interval);
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chSysUnlock();
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}
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/**
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* @brief Starts the timer in one shot mode.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval time interval in ticks
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*
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* @api
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*/
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void gptStartOneShotI(GPTDriver *gptp, gptcnt_t interval) {
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chDbgCheckClassI();
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chDbgCheck(gptp != NULL, "gptStartOneShotI");
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chDbgAssert(gptp->state == GPT_READY,
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"gptStartOneShotI(), #1", "invalid state");
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gptp->state = GPT_ONESHOT;
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gpt_lld_start_timer(gptp, interval);
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}
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/**
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* @brief Stops the timer.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @api
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*/
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void gptStopTimer(GPTDriver *gptp) {
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chSysLock();
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gptStopTimerI(gptp);
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chSysUnlock();
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}
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/**
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* @brief Stops the timer.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @api
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*/
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void gptStopTimerI(GPTDriver *gptp) {
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chDbgCheckClassI();
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chDbgCheck(gptp != NULL, "gptStopTimerI");
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chDbgAssert((gptp->state == GPT_READY) || (gptp->state == GPT_CONTINUOUS) ||
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(gptp->state == GPT_ONESHOT),
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"gptStopTimerI(), #1", "invalid state");
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gptp->state = GPT_READY;
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gpt_lld_stop_timer(gptp);
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}
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/**
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* @brief Starts the timer in one shot mode and waits for completion.
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* @details This function specifically polls the timer waiting for completion
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* in order to not have extra delays caused by interrupt servicing,
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* this function is only recommended for short delays.
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* @note The configured callback is not invoked when using this function.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval time interval in ticks
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*
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* @api
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*/
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void gptPolledDelay(GPTDriver *gptp, gptcnt_t interval) {
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chDbgAssert(gptp->state == GPT_READY,
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"gptPolledDelay(), #1", "invalid state");
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gptp->state = GPT_ONESHOT;
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gpt_lld_polled_delay(gptp, interval);
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gptp->state = GPT_READY;
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}
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#endif /* HAL_USE_GPT */
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/** @} */
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