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/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file hal_dac.c
* @brief DAC Driver code.
*
* @addtogroup DAC
* @{
*/
#include "hal.h"
#if (HAL_USE_DAC == TRUE) || 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
#if DAC_USE_MUTUAL_EXCLUSION
osalMutexObjectInit(&dacp->mutex);
#endif
#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, it can be
* @p NULL if the low level driver implementation
* supports a default configuration
*
* @api
*/
void dacStart(DACDriver *dacp, const DACConfig *config) {
osalDbgCheck(dacp != 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->config = NULL;
dacp->state = DAC_STOP;
osalSysUnlock();
}
/**
* @brief Outputs a value directly on a DAC channel.
*
* @param[in] dacp pointer to the @p DACDriver object
* @param[in] channel DAC channel number
* @param[in] sample value to be output
*
* @xclass
*/
void dacPutChannelX(DACDriver *dacp, dacchannel_t channel, dacsample_t sample) {
osalDbgCheck(channel < DAC_MAX_CHANNELS);
osalDbgAssert(dacp->state == DAC_READY, "invalid state");
dac_lld_put_channel(dacp, channel, sample);
}
/**
* @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,
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,
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 == TRUE) || 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,
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 == TRUE */
#if (DAC_USE_MUTUAL_EXCLUSION == TRUE) || 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 == TRUE */
#endif /* HAL_USE_DAC == TRUE */
/** @} */
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