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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 PWM.c
* @brief PWM Driver code.
* @addtogroup PWM
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_PWM || defined(__DOXYGEN__)
/**
* @brief PWM Driver initialization.
*/
void pwmInit(void) {
pwm_lld_init();
}
/**
* @brief Initializes the standard part of a @p PWMDriver structure.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*/
void pwmObjectInit(PWMDriver *pwmp) {
pwmp->pd_state = PWM_STOP;
pwmp->pd_config = NULL;
}
/**
* @brief Configures and activates the PWM peripheral.
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] config pointer to a @p PWMConfig object
*/
void pwmStart(PWMDriver *pwmp, const PWMConfig *config) {
chDbgCheck((pwmp != NULL) && (config != NULL), "pwmStart");
chSysLock();
chDbgAssert((pwmp->pd_state == PWM_STOP) || (pwmp->pd_state == PWM_READY),
"pwmStart(), #1",
"invalid state");
pwmp->pd_config = config;
pwm_lld_start(pwmp);
pwmp->pd_state = PWM_READY;
chSysUnlock();
}
/**
* @brief Deactivates the PWM peripheral.
*
* @param[in] pwmp pointer to a @p PWMDriver object
*/
void pwmStop(PWMDriver *pwmp) {
chDbgCheck(pwmp != NULL, "pwmStop");
chSysLock();
chDbgAssert((pwmp->pd_state == PWM_STOP) || (pwmp->pd_state == PWM_READY),
"pwmStop(), #1",
"invalid state");
pwm_lld_stop(pwmp);
pwmp->pd_state = PWM_STOP;
chSysUnlock();
}
/**
* @brief Setups a PWM channel.
* @details Associates a configuration to a PWM channel, this operation is
* required before a channel can be enabled using
* @p pwmEnableChannel().
*
* @param[in] pwmp pointer to a @p PWMDriver object
* @param[in] channel PWM channel identifier
* @param[in] pccp pointer to a @p PWMChannelConfig object
*/
void pwmSetupChannel(PWMDriver *pwmp, pwmchannel_t channel,
const PWMChannelConfig *pccp) {
chDbgCheck((pwmp != NULL) && (channel < PWM_CHANNELS) && (pccp != NULL),
"pwmSetupChannel");
chSysLock();
chDbgAssert((pwmp->pd_state == PWM_READY) &&
!pwm_lld_is_enabled(pwmp, channel),
"pwmSetupChannel(), #1", "invalid state");
pwmp->pd_channel_configs[channel] = pccp;
pwm_lld_setup_channel(pwmp, channel);
chSysUnlock();
}
/**
* @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 pwmEnableChannel(PWMDriver *pwmp,
pwmchannel_t channel,
pwmcnt_t width) {
chDbgCheck((pwmp != NULL) && (channel < PWM_CHANNELS),
"pwmEnableChannel");
chSysLock();
chDbgAssert((pwmp->pd_state == PWM_READY) &&
(pwmp->pd_channel_configs[channel] != NULL),
"pwmEnableChannel(), #1", "invalid state");
pwm_lld_enable_channel(pwmp, channel, width);
chSysUnlock();
}
/**
* @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 pwmDisableChannel(PWMDriver *pwmp, pwmchannel_t channel) {
chDbgCheck((pwmp != NULL) && (channel < PWM_CHANNELS),
"pwmEnableChannel");
chSysLock();
chDbgAssert((pwmp->pd_state == PWM_READY) &&
(pwmp->pd_channel_configs[channel] != NULL),
"pwmDisableChannel(), #1", "invalid state");
pwm_lld_disable_channel(pwmp, channel);
chSysUnlock();
}
#endif /* CH_HAL_USE_PWM */
/** @} */
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