/*
ChibiOS - Copyright (C) 2006..2016 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 hal_pwm.c
* @brief PWM Driver code.
*
* @addtogroup PWM
* @{
*/
#include "hal.h"
#if (HAL_USE_PWM == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief PWM Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void pwmInit(void) {
pwm_lld_init();
}
/**
* @brief Initializes the standard part of a @p PWMDriver structure.
*
* @param[out] pwmp pointer to a @p PWMDriver object
*
* @init
*/
void pwmObjectInit(PWMDriver *pwmp) {
pwmp->state = PWM_STOP;
pwmp->config = NULL;
pwmp->enabled = 0;
pwmp->channels = 0;
#if defined(PWM_DRIVER_EXT_INIT_HOOK)
PWM_DRIVER_EXT_INIT_HOOK(pwmp);
#endif
}
/**
* @brief Configures and activates the PWM peripheral.
* @note Starting a driver that is already in the @p PWM_READY state
* disables all the active channels.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] config pointer to a @p PWMConfig object
*
* @api
*/
void pwmStart(PWMDriver *pwmp, const PWMConfig *config) {
osalDbgCheck((pwmp != NULL) && (config != NULL));
osalSysLock();
osalDbgAssert((pwmp->state == PWM_STOP) || (pwmp->state == PWM_READY),
"invalid state");
pwmp->config = config;
pwmp->period = config->period;
pwm_lld_start(pwmp);
pwmp->enabled = 0;
pwmp->state = PWM_READY;
osalSysUnlock();
}
/**
* @brief Deactivates the PWM peripheral.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*
* @api
*/
void pwmStop(PWMDriver *pwmp) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert((pwmp->state == PWM_STOP) || (pwmp->state == PWM_READY),
"invalid state");
pwm_lld_stop(pwmp);
pwmp->enabled = 0;
pwmp->config = NULL;
pwmp->state = PWM_STOP;
osalSysUnlock();
}
/**
* @brief Changes the period the PWM peripheral.
* @details This function changes the period of a PWM unit that has already
* been activated using @p pwmStart().
* @pre The PWM unit must have been activated using @p pwmStart().
* @post The PWM unit period is changed to the new value.
* @note If a period is specified that is shorter than the pulse width
* programmed in one of the channels then the behavior is not
* guaranteed.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] period new cycle time in ticks
*
* @api
*/
void pwmChangePeriod(PWMDriver *pwmp, pwmcnt_t period) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "invalid state");
pwmChangePeriodI(pwmp, period);
osalSysUnlock();
}
/**
* @brief Enables a PWM channel.
* @pre The PWM unit must have been activated using @p pwmStart().
* @post The channel is active using the specified configuration.
* @note Depending on the hardware implementation this function has
* effect starting on the next cycle (recommended implementation)
* or immediately (fallback implementation).
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
* @param[in] width PWM pulse width as clock pulses number
*
* @api
*/
void pwmEnableChannel(PWMDriver *pwmp,
pwmchannel_t channel,
pwmcnt_t width) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
pwmEnableChannelI(pwmp, channel, width);
osalSysUnlock();
}
/**
* @brief Disables a PWM channel and its notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @post The channel is disabled and its output line returned to the
* idle state.
* @note Depending on the hardware implementation this function has
* effect starting on the next cycle (recommended implementation)
* or immediately (fallback implementation).
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
*
* @api
*/
void pwmDisableChannel(PWMDriver *pwmp, pwmchannel_t channel) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
pwmDisableChannelI(pwmp, channel);
osalSysUnlock();
}
/**
* @brief Enables the periodic activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @note If the notification is already enabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*
* @api
*/
void pwmEnablePeriodicNotification(PWMDriver *pwmp) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert(pwmp->config->callback != NULL, "undefined periodic callback");
pwmEnablePeriodicNotificationI(pwmp);
osalSysUnlock();
}
/**
* @brief Disables the periodic activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @note If the notification is already disabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*
* @api
*/
void pwmDisablePeriodicNotification(PWMDriver *pwmp) {
osalDbgCheck(pwmp != NULL);
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert(pwmp->config->callback != NULL, "undefined periodic callback");
pwmDisablePeriodicNotificationI(pwmp);
osalSysUnlock();
}
/**
* @brief Enables a channel de-activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @pre The channel must have been activated using @p pwmEnableChannel().
* @note If the notification is already enabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
*
* @api
*/
void pwmEnableChannelNotification(PWMDriver *pwmp, pwmchannel_t channel) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert((pwmp->enabled & ((pwmchnmsk_t)1U << (pwmchnmsk_t)channel)) != 0U,
"channel not enabled");
osalDbgAssert(pwmp->config->channels[channel].callback != NULL,
"undefined channel callback");
pwmEnableChannelNotificationI(pwmp, channel);
osalSysUnlock();
}
/**
* @brief Disables a channel de-activation edge notification.
* @pre The PWM unit must have been activated using @p pwmStart().
* @pre The channel must have been activated using @p pwmEnableChannel().
* @note If the notification is already disabled then the call has no effect.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier (0...channels-1)
*
* @api
*/
void pwmDisableChannelNotification(PWMDriver *pwmp, pwmchannel_t channel) {
osalDbgCheck((pwmp != NULL) && (channel < pwmp->channels));
osalSysLock();
osalDbgAssert(pwmp->state == PWM_READY, "not ready");
osalDbgAssert((pwmp->enabled & ((pwmchnmsk_t)1U << (pwmchnmsk_t)channel)) != 0U,
"channel not enabled");
osalDbgAssert(pwmp->config->channels[channel].callback != NULL,
"undefined channel callback");
pwmDisableChannelNotificationI(pwmp, channel);
osalSysUnlock();
}
#endif /* HAL_USE_PWM == TRUE */
/** @} */
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