187 lines
5.7 KiB
C
187 lines
5.7 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file templates/pwm_lld.c
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* @brief PWM Driver subsystem low level driver source template.
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*
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* @addtogroup PWM
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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_PWM || 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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* @brief PWM1 driver identifier.
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*/
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#if PLATFORM_PWM_USE_PWM1 || defined(__DOXYGEN__)
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PWMDriver PWMD1;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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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 interrupt handlers. */
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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 Low level PWM driver initialization.
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*
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* @notapi
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*/
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void pwm_lld_init(void) {
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#if PLATFORM_PWM_USE_PWM1
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/* Driver initialization.*/
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pwmObjectInit(&PWMD1);
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#endif /* PLATFORM_PWM_USE_PWM1 */
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}
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/**
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* @brief Configures and activates the PWM peripheral.
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*
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* @param[in] pwmp pointer to the @p PWMDriver object
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*
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* @notapi
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*/
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void pwm_lld_start(PWMDriver *pwmp) {
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if (pwmp->state == PWM_STOP) {
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/* Enables the peripheral.*/
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#if PLATFORM_PWM_USE_PWM1
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if (&PWMD1 == pwmp) {
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}
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#endif /* PLATFORM_PWM_USE_PWM1 */
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}
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/* Configures the peripheral.*/
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}
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/**
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* @brief Deactivates the PWM peripheral.
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*
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* @param[in] pwmp pointer to the @p PWMDriver object
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*
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* @notapi
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*/
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void pwm_lld_stop(PWMDriver *pwmp) {
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if (pwmp->state == PWM_READY) {
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/* Resets the peripheral.*/
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/* Disables the peripheral.*/
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#if PLATFORM_PWM_USE_PWM1
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if (&PWMD1 == pwmp) {
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}
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#endif /* PLATFORM_PWM_USE_PWM1 */
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}
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}
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/**
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* @brief Changes the period the PWM peripheral.
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* @details This function changes the period of a PWM unit that has already
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* been activated using @p pwmStart().
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* @pre The PWM unit must have been activated using @p pwmStart().
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* @post The PWM unit period is changed to the new value.
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* @note The function has effect at the next cycle start.
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* @note If a period is specified that is shorter than the pulse width
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* programmed in one of the channels then the behavior is not
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* guaranteed.
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*
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* @param[in] pwmp pointer to a @p PWMDriver object
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* @param[in] period new cycle time in ticks
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*
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* @notapi
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*/
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void pwm_lld_change_period(PWMDriver *pwmp, pwmcnt_t period) {
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(void)pwmp;
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(void)period;
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}
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/**
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* @brief Enables a PWM channel.
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* @pre The PWM unit must have been activated using @p pwmStart().
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* @post The channel is active using the specified configuration.
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* @note Depending on the hardware implementation this function has
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* effect starting on the next cycle (recommended implementation)
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* or immediately (fallback implementation).
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*
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* @param[in] pwmp pointer to a @p PWMDriver object
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* @param[in] channel PWM channel identifier (0...PWM_CHANNELS-1)
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* @param[in] width PWM pulse width as clock pulses number
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*
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* @notapi
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*/
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void pwm_lld_enable_channel(PWMDriver *pwmp,
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pwmchannel_t channel,
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pwmcnt_t width) {
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(void)pwmp;
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(void)channel;
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(void)width;
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}
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/**
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* @brief Disables a PWM channel.
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* @pre The PWM unit must have been activated using @p pwmStart().
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* @post The channel is disabled and its output line returned to the
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* idle state.
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* @note Depending on the hardware implementation this function has
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* effect starting on the next cycle (recommended implementation)
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* or immediately (fallback implementation).
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*
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* @param[in] pwmp pointer to a @p PWMDriver object
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* @param[in] channel PWM channel identifier (0...PWM_CHANNELS-1)
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*
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* @notapi
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*/
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void pwm_lld_disable_channel(PWMDriver *pwmp, pwmchannel_t channel) {
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(void)pwmp;
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(void)channel;
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}
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#endif /* HAL_USE_PWM */
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/** @} */
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