mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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ChibiOS 2.6.8, until I can figure out where to get it from git.
This commit is contained in:
Jared Boone
Executable
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/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012,2013 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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---
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes ChibiOS/RT, without being obliged to provide
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the source code for any proprietary components. See the file exception.txt
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for full details of how and when the exception can be applied.
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*/
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/**
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* @file pwm.c
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* @brief PWM Driver code.
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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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/* 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 exported functions. */
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/*===========================================================================*/
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/**
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* @brief PWM Driver initialization.
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* @note This function is implicitly invoked by @p halInit(), there is
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* no need to explicitly initialize the driver.
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*
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* @init
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*/
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void pwmInit(void) {
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pwm_lld_init();
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}
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/**
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* @brief Initializes the standard part of a @p PWMDriver structure.
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*
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* @param[out] pwmp pointer to a @p PWMDriver object
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*
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* @init
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*/
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void pwmObjectInit(PWMDriver *pwmp) {
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pwmp->state = PWM_STOP;
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pwmp->config = NULL;
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#if defined(PWM_DRIVER_EXT_INIT_HOOK)
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PWM_DRIVER_EXT_INIT_HOOK(pwmp);
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#endif
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}
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/**
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* @brief Configures and activates the PWM peripheral.
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* @note Starting a driver that is already in the @p PWM_READY state
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* disables all the active channels.
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*
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* @param[in] pwmp pointer to a @p PWMDriver object
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* @param[in] config pointer to a @p PWMConfig object
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*
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* @api
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*/
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void pwmStart(PWMDriver *pwmp, const PWMConfig *config) {
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chDbgCheck((pwmp != NULL) && (config != NULL), "pwmStart");
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chSysLock();
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chDbgAssert((pwmp->state == PWM_STOP) || (pwmp->state == PWM_READY),
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"pwmStart(), #1", "invalid state");
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pwmp->config = config;
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pwmp->period = config->period;
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pwm_lld_start(pwmp);
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pwmp->state = PWM_READY;
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chSysUnlock();
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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 a @p PWMDriver object
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*
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* @api
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*/
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void pwmStop(PWMDriver *pwmp) {
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chDbgCheck(pwmp != NULL, "pwmStop");
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chSysLock();
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chDbgAssert((pwmp->state == PWM_STOP) || (pwmp->state == PWM_READY),
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"pwmStop(), #1", "invalid state");
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pwm_lld_stop(pwmp);
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pwmp->state = PWM_STOP;
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chSysUnlock();
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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 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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* @api
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*/
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void pwmChangePeriod(PWMDriver *pwmp, pwmcnt_t period) {
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chDbgCheck(pwmp != NULL, "pwmChangePeriod");
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chSysLock();
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chDbgAssert(pwmp->state == PWM_READY,
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"pwmChangePeriod(), #1", "invalid state");
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pwmChangePeriodI(pwmp, period);
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chSysUnlock();
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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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* @api
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*/
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void pwmEnableChannel(PWMDriver *pwmp,
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pwmchannel_t channel,
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pwmcnt_t width) {
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chDbgCheck((pwmp != NULL) && (channel < PWM_CHANNELS),
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"pwmEnableChannel");
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chSysLock();
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chDbgAssert(pwmp->state == PWM_READY,
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"pwmEnableChannel(), #1", "not ready");
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pwm_lld_enable_channel(pwmp, channel, width);
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chSysUnlock();
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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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* @api
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*/
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void pwmDisableChannel(PWMDriver *pwmp, pwmchannel_t channel) {
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chDbgCheck((pwmp != NULL) && (channel < PWM_CHANNELS),
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"pwmEnableChannel");
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chSysLock();
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chDbgAssert(pwmp->state == PWM_READY,
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"pwmDisableChannel(), #1", "not ready");
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pwm_lld_disable_channel(pwmp, channel);
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chSysUnlock();
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}
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#endif /* HAL_USE_PWM */
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/** @} */
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