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/*
ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file gpt.c
* @brief GPT Driver code.
*
* @addtogroup GPT
* @{
*/
#include "hal.h"
#if (HAL_USE_GPT == TRUE) || 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 be running in continuous mode.
* @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);
osalDbgCheck(gptp->config->callback != 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 == TRUE */
/** @} */
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