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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 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 dac.c
* @brief DAC Driver code.
*
* @addtogroup DAC
* @{
*/
#include "hal.h"
#if HAL_USE_DAC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief DAC Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void dacInit(void) {
dac_lld_init();
}
/**
* @brief Initializes the standard part of a @p DACDriver structure.
*
* @param[out] dacp pointer to the @p DACDriver object
*
* @init
*/
void dacObjectInit(DACDriver *dacp) {
dacp->state = DAC_STOP;
dacp->config = NULL;
#if DAC_USE_WAIT
dacp->thread = NULL;
#endif /* DAC_USE_WAIT */
#if DAC_USE_MUTUAL_EXCLUSION
osalMutexObjectInit(&dacp->mutex);
#endif /* DAC_USE_MUTUAL_EXCLUSION */
#if defined(DAC_DRIVER_EXT_INIT_HOOK)
DAC_DRIVER_EXT_INIT_HOOK(dacp);
#endif
}
/**
* @brief Configures and activates the DAC peripheral.
*
* @param[in] dacp pointer to the @p DACDriver object
* @param[in] config pointer to the @p DACConfig object
*
* @api
*/
void dacStart(DACDriver *dacp, const DACConfig *config) {
osalDbgCheck((dacp != NULL) && (config != NULL));
osalSysLock();
osalDbgAssert((dacp->state == DAC_STOP) || (dacp->state == DAC_READY),
"invalid state");
dacp->config = config;
dac_lld_start(dacp);
dacp->state = DAC_READY;
osalSysUnlock();
}
/**
* @brief Deactivates the DAC peripheral.
* @note Deactivating the peripheral also enforces a release of the slave
* select line.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @api
*/
void dacStop(DACDriver *dacp) {
osalDbgCheck(dacp != NULL);
osalSysLock();
osalDbgAssert((dacp->state == DAC_STOP) || (dacp->state == DAC_READY),
"invalid state");
dac_lld_stop(dacp);
dacp->state = DAC_STOP;
osalSysUnlock();
}
/**
* @brief Starts a DAC conversion.
* @details Starts an asynchronous conversion operation.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] dacp pointer to the @p DACDriver object
* @param[in] grpp pointer to a @p DACConversionGroup object
* @param[in] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
*
* @api
*/
void dacStartConversion(DACDriver *dacp,
const DACConversionGroup *grpp,
const dacsample_t *samples,
size_t depth) {
osalSysLock();
dacStartConversionI(dacp, grpp, samples, depth);
osalSysUnlock();
}
/**
* @brief Starts a DAC conversion.
* @details Starts an asynchronous conversion operation.
* @post The callbacks associated to the conversion group will be invoked
* on buffer fill and error events.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] dacp pointer to the @p DACDriver object
* @param[in] grpp pointer to a @p DACConversionGroup object
* @param[in] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
*
* @iclass
*/
void dacStartConversionI(DACDriver *dacp,
const DACConversionGroup *grpp,
const dacsample_t *samples,
size_t depth) {
osalDbgCheckClassI();
osalDbgCheck((dacp != NULL) && (grpp != NULL) && (samples != NULL) &&
((depth == 1) || ((depth & 1) == 0)));
osalDbgAssert((dacp->state == DAC_READY) ||
(dacp->state == DAC_COMPLETE) ||
(dacp->state == DAC_ERROR),
"not ready");
dacp->samples = samples;
dacp->depth = depth;
dacp->grpp = grpp;
dacp->state = DAC_ACTIVE;
dac_lld_start_conversion(dacp);
}
/**
* @brief Stops an ongoing conversion.
* @details This function stops the currently ongoing conversion and returns
* the driver in the @p DAC_READY state. If there was no conversion
* being processed then the function does nothing.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @api
*/
void dacStopConversion(DACDriver *dacp) {
osalDbgCheck(dacp != NULL);
osalSysLock();
osalDbgAssert((dacp->state == DAC_READY) ||
(dacp->state == DAC_ACTIVE),
"invalid state");
if (dacp->state != DAC_READY) {
dac_lld_stop_conversion(dacp);
dacp->grpp = NULL;
dacp->state = DAC_READY;
_dac_reset_s(dacp);
}
osalSysUnlock();
}
/**
* @brief Stops an ongoing conversion.
* @details This function stops the currently ongoing conversion and returns
* the driver in the @p DAC_READY state. If there was no conversion
* being processed then the function does nothing.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @iclass
*/
void dacStopConversionI(DACDriver *dacp) {
osalDbgCheckClassI();
osalDbgCheck(dacp != NULL);
osalDbgAssert((dacp->state == DAC_READY) ||
(dacp->state == DAC_ACTIVE) ||
(dacp->state == DAC_COMPLETE),
"invalid state");
if (dacp->state != DAC_READY) {
dac_lld_stop_conversion(dacp);
dacp->grpp = NULL;
dacp->state = DAC_READY;
_dac_reset_i(dacp);
}
}
#if DAC_USE_WAIT || defined(__DOXYGEN__)
/**
* @brief Performs a DAC conversion.
* @details Performs a synchronous conversion operation.
* @note The buffer is organized as a matrix of M*N elements where M is the
* channels number configured into the conversion group and N is the
* buffer depth. The samples are sequentially written into the buffer
* with no gaps.
*
* @param[in] dacp pointer to the @p DACDriver object
* @param[in] grpp pointer to a @p DACConversionGroup object
* @param[out] samples pointer to the samples buffer
* @param[in] depth buffer depth (matrix rows number). The buffer depth
* must be one or an even number.
* @return The operation result.
* @retval MSG_OK Conversion finished.
* @retval MSG_RESET The conversion has been stopped using
* @p acdStopConversion() or @p acdStopConversionI(),
* the result buffer may contain incorrect data.
* @retval MSG_TIMEOUT The conversion has been stopped because an hardware
* error.
*
* @api
*/
msg_t dacConvert(DACDriver *dacp,
const DACConversionGroup *grpp,
const dacsample_t *samples,
size_t depth) {
msg_t msg;
osalSysLock();
dacStartConversionI(dacp, grpp, samples, depth);
msg = osalThreadSuspendS(&dacp->thread);
osalSysUnlock();
return msg;
}
#endif /* DAC_USE_WAIT */
#if DAC_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
/**
* @brief Gains exclusive access to the DAC bus.
* @details This function tries to gain ownership to the DAC bus, if the bus
* is already being used then the invoking thread is queued.
* @pre In order to use this function the option @p DAC_USE_MUTUAL_EXCLUSION
* must be enabled.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @api
*/
void dacAcquireBus(DACDriver *dacp) {
osalDbgCheck(dacp != NULL);
osalMutexLock(&dacp->mutex);
}
/**
* @brief Releases exclusive access to the DAC bus.
* @pre In order to use this function the option @p DAC_USE_MUTUAL_EXCLUSION
* must be enabled.
*
* @param[in] dacp pointer to the @p DACDriver object
*
* @api
*/
void dacReleaseBus(DACDriver *dacp) {
osalDbgCheck(dacp != NULL);
osalMutexUnlock(&dacp->mutex);
}
#endif /* DAC_USE_MUTUAL_EXCLUSION */
#endif /* HAL_USE_DAC */
/** @} */
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