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/*
ChibiOS/RT - Copyright (C) 2006-2007 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 STM32/pwm_lld.c
* @brief STM32 PWM subsystem low level driver header.
* @addtogroup STM32_PWM
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_PWM || defined(__DOXYGEN__)
/** @brief PWM1 driver identifier.*/
#if defined(USE_STM32_PWM1) || defined(__DOXYGEN__)
PWMDriver PWMD1;
#endif
/*===========================================================================*/
/* Low Level Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Low Level Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Low Level Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Low Level Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Low Level Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level PWM driver initialization.
*/
void pwm_lld_init(void) {
#if USE_STM32_PWM1
/* TIM1 reset, ensures reset state in order to avoid trouble with JTAGs.*/
RCC->APB2RSTR = RCC_APB2RSTR_TIM1RST;
RCC->APB2RSTR = 0;
/* Driver initialization.*/
pwmObjectInit(&PWMD1);
#endif
}
/**
* @brief Configures and activates the PWM peripheral.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*/
void pwm_lld_start(PWMDriver *pwmp) {
if (pwmp->pd_state == PWM_STOP) {
/* Clock activation.*/
#if USE_STM32_PWM1
if (&PWMD1 == pwmp) {
NVICEnableVector(TIM1_CC_IRQn, STM32_PWM1_IRQ_PRIORITY);
RCC->APB2ENR |= RCC_APB2ENR_TIM1EN;
}
#endif
}
/* Configuration.*/
}
/**
* @brief Deactivates the PWM peripheral.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*/
void pwm_lld_stop(PWMDriver *pwmp) {
/* If in ready state then disables the PWM clock.*/
if (pwmp->pd_state == PWM_READY) {
#if USE_STM32_PWM1
if (&PWMD1 == pwmp) {
NVICDisableVector(TIM1_CC_IRQn);
RCC->APB2ENR &= ~RCC_APB2ENR_TIM1EN;
}
#endif
}
}
/**
* @brief Determines whatever the PWM channel is already enabled.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier
*
* @return The PWM channel status.
* @retval FALSE the channel is not enabled.
* @retval TRUE the channel is enabled.
*/
bool_t pwm_lld_is_enabled(PWMDriver *pwmp, pwmchannel_t channel) {
return (pwmp->pd_enabled_channels & (1 << channel)) != 0;
}
/**
* @brief Setups a PWM channel.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier
*/
void pwm_lld_setup_channel(PWMDriver *pwmp, pwmchannel_t channel) {
}
/**
* @brief Enables a PWM channel.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier
* @param[in] width PWM pulse width as clock pulses number
*/
void pwm_lld_enable_channel(PWMDriver *pwmp,
pwmchannel_t channel,
pwmcnt_t width) {
pwmp->pd_enabled_channels |= (1 << channel);
}
/**
* @brief Disables a PWM channel.
* @details The channel is disabled and its output line returned to the
* idle state.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier
*/
void pwm_lld_disable_channel(PWMDriver *pwmp, pwmchannel_t channel) {
pwmp->pd_enabled_channels &= ~(1 << channel);
}
#endif /* CH_HAL_USE_PWM */
/** @} */
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