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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 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 gpt.c
* @brief GPT Driver code.
*
* @addtogroup GPT
* @{
*/
#include "hal.h"
#if HAL_USE_GPT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief GPT Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void gptInit(void) {
gpt_lld_init();
}
/**
* @brief Initializes the standard part of a @p GPTDriver structure.
*
* @param[out] gptp pointer to the @p GPTDriver object
*
* @init
*/
void gptObjectInit(GPTDriver *gptp) {
gptp->state = GPT_STOP;
gptp->config = NULL;
}
/**
* @brief Configures and activates the GPT peripheral.
*
* @param[in] gptp pointer to the @p GPTDriver object
* @param[in] config pointer to the @p GPTConfig object
*
* @api
*/
void gptStart(GPTDriver *gptp, const GPTConfig *config) {
osalDbgCheck((gptp != NULL) && (config != NULL));
osalSysLock();
osalDbgAssert((gptp->state == GPT_STOP) || (gptp->state == GPT_READY),
"invalid state");
gptp->config = config;
gpt_lld_start(gptp);
gptp->state = GPT_READY;
osalSysUnlock();
}
/**
* @brief Deactivates the GPT peripheral.
*
* @param[in] gptp pointer to the @p GPTDriver object
*
* @api
*/
void gptStop(GPTDriver *gptp) {
osalDbgCheck(gptp != NULL);
osalSysLock();
osalDbgAssert((gptp->state == GPT_STOP) || (gptp->state == GPT_READY),
"invalid state");
gpt_lld_stop(gptp);
gptp->state = GPT_STOP;
osalSysUnlock();
}
/**
* @brief Changes the interval of GPT peripheral.
* @details This function changes the interval of a running GPT unit.
* @pre The GPT unit must have been activated using @p gptStart().
* @pre The GPT unit must have been running in continuous mode using
* @p gptStartContinuous().
* @post The GPT unit interval is changed to the new value.
*
* @param[in] gptp pointer to a @p GPTDriver object
* @param[in] interval new cycle time in timer ticks
*
* @api
*/
void gptChangeInterval(GPTDriver *gptp, gptcnt_t interval) {
osalDbgCheck(gptp != NULL);
osalSysLock();
osalDbgAssert(gptp->state == GPT_CONTINUOUS,
"invalid state");
gptChangeIntervalI(gptp, interval);
osalSysUnlock();
}
/**
* @brief Starts the timer in continuous mode.
*
* @param[in] gptp pointer to the @p GPTDriver object
* @param[in] interval period in ticks
*
* @api
*/
void gptStartContinuous(GPTDriver *gptp, gptcnt_t interval) {
osalSysLock();
gptStartContinuousI(gptp, interval);
osalSysUnlock();
}
/**
* @brief Starts the timer in continuous mode.
*
* @param[in] gptp pointer to the @p GPTDriver object
* @param[in] interval period in ticks
*
* @iclass
*/
void gptStartContinuousI(GPTDriver *gptp, gptcnt_t interval) {
osalDbgCheckClassI();
osalDbgCheck(gptp != NULL);
osalDbgAssert(gptp->state == GPT_READY,
"invalid state");
gptp->state = GPT_CONTINUOUS;
gpt_lld_start_timer(gptp, interval);
}
/**
* @brief Starts the timer in one shot mode.
*
* @param[in] gptp pointer to the @p GPTDriver object
* @param[in] interval time interval in ticks
*
* @api
*/
void gptStartOneShot(GPTDriver *gptp, gptcnt_t interval) {
osalSysLock();
gptStartOneShotI(gptp, interval);
osalSysUnlock();
}
/**
* @brief Starts the timer in one shot mode.
*
* @param[in] gptp pointer to the @p GPTDriver object
* @param[in] interval time interval in ticks
*
* @api
*/
void gptStartOneShotI(GPTDriver *gptp, gptcnt_t interval) {
osalDbgCheckClassI();
osalDbgCheck(gptp != NULL);
osalDbgAssert(gptp->state == GPT_READY,
"invalid state");
gptp->state = GPT_ONESHOT;
gpt_lld_start_timer(gptp, interval);
}
/**
* @brief Stops the timer.
*
* @param[in] gptp pointer to the @p GPTDriver object
*
* @api
*/
void gptStopTimer(GPTDriver *gptp) {
osalSysLock();
gptStopTimerI(gptp);
osalSysUnlock();
}
/**
* @brief Stops the timer.
*
* @param[in] gptp pointer to the @p GPTDriver object
*
* @api
*/
void gptStopTimerI(GPTDriver *gptp) {
osalDbgCheckClassI();
osalDbgCheck(gptp != NULL);
osalDbgAssert((gptp->state == GPT_READY) || (gptp->state == GPT_CONTINUOUS) ||
(gptp->state == GPT_ONESHOT),
"invalid state");
gptp->state = GPT_READY;
gpt_lld_stop_timer(gptp);
}
/**
* @brief Starts the timer in one shot mode and waits for completion.
* @details This function specifically polls the timer waiting for completion
* in order to not have extra delays caused by interrupt servicing,
* this function is only recommended for short delays.
* @note The configured callback is not invoked when using this function.
*
* @param[in] gptp pointer to the @p GPTDriver object
* @param[in] interval time interval in ticks
*
* @api
*/
void gptPolledDelay(GPTDriver *gptp, gptcnt_t interval) {
osalDbgAssert(gptp->state == GPT_READY,
"invalid state");
gptp->state = GPT_ONESHOT;
gpt_lld_polled_delay(gptp, interval);
gptp->state = GPT_READY;
}
#endif /* HAL_USE_GPT */
/** @} */
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