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/*
ChibiOS/RT - Copyright (C) 2006-2013 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 templates/pwm_lld.c
* @brief PWM Driver subsystem low level driver source template.
*
* @addtogroup PWM
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_PWM || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief PWM1 driver identifier.
*/
#if PLATFORM_PWM_USE_PWM1 || defined(__DOXYGEN__)
PWMDriver PWMD1;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level PWM driver initialization.
*
* @notapi
*/
void pwm_lld_init(void) {
#if PLATFORM_PWM_USE_PWM1
/* Driver initialization.*/
pwmObjectInit(&PWMD1);
#endif /* PLATFORM_PWM_USE_PWM1 */
}
/**
* @brief Configures and activates the PWM peripheral.
*
* @param[in] pwmp pointer to the @p PWMDriver object
*
* @notapi
*/
void pwm_lld_start(PWMDriver *pwmp) {
if (pwmp->state == PWM_STOP) {
/* Enables the peripheral.*/
#if PLATFORM_PWM_USE_PWM1
if (&PWMD1 == pwmp) {
}
#endif /* PLATFORM_PWM_USE_PWM1 */
}
/* Configures the peripheral.*/
}
/**
* @brief Deactivates the PWM peripheral.
*
* @param[in] pwmp pointer to the @p PWMDriver object
*
* @notapi
*/
void pwm_lld_stop(PWMDriver *pwmp) {
if (pwmp->state == PWM_READY) {
/* Resets the peripheral.*/
/* Disables the peripheral.*/
#if PLATFORM_PWM_USE_PWM1
if (&PWMD1 == pwmp) {
}
#endif /* PLATFORM_PWM_USE_PWM1 */
}
}
/**
* @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 The function has effect at the next cycle start.
* @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
*
* @notapi
*/
void pwm_lld_change_period(PWMDriver *pwmp, pwmcnt_t period) {
(void)pwmp;
(void)period;
}
/**
* @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...PWM_CHANNELS-1)
* @param[in] width PWM pulse width as clock pulses number
*
* @notapi
*/
void pwm_lld_enable_channel(PWMDriver *pwmp,
pwmchannel_t channel,
pwmcnt_t width) {
(void)pwmp;
(void)channel;
(void)width;
}
/**
* @brief Disables a PWM channel.
* @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...PWM_CHANNELS-1)
*
* @notapi
*/
void pwm_lld_disable_channel(PWMDriver *pwmp, pwmchannel_t channel) {
(void)pwmp;
(void)channel;
}
#endif /* HAL_USE_PWM */
/** @} */
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