hal_dac_lld.c

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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_lld.c
 * @brief   PLATFORM DAC subsystem low level driver source.
 *
 * @addtogroup DAC
 * @{
 */

#include "hal.h"

#if (HAL_USE_DAC == TRUE) || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver local definitions.                                                 */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported variables.                                                */
/*===========================================================================*/

/** @brief DAC1 driver identifier.*/
#if (PLATFORM_DAC_USE_DAC1 == TRUE) || defined(__DOXYGEN__)
DACDriver DACD1;
#endif

/*===========================================================================*/
/* Driver local variables.                                                   */
/*===========================================================================*/

/*===========================================================================*/
/* Driver local functions.                                                   */
/*===========================================================================*/

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/**
 * @brief   Low level DAC driver initialization.
 *
 * @notapi
 */
void dac_lld_init(void) {

#if PLATFORM_DAC_USE_DAC1 == TRUE
  dacObjectInit(&DACD1);
#endif
}

/**
 * @brief   Configures and activates the DAC peripheral.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
void dac_lld_start(DACDriver *dacp) {

  /* If the driver is in DAC_STOP state then a full initialization is
     required.*/
  if (dacp->state == DAC_STOP) {
    /* Enabling the clock source.*/
#if PLATFORM_DAC_USE_DAC1 == TRUE
    if (&DACD1 == dacp) {

    }
#endif
  }
}

/**
 * @brief   Deactivates the DAC peripheral.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
void dac_lld_stop(DACDriver *dacp) {

  /* If in ready state then disables the DAC clock.*/
  if (dacp->state == DAC_READY) {

#if PLATFORM_DAC_USE_DAC1 == TRUE
    if (&DACD1 == dacp) {

    }
#endif
  }
}

/**
 * @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
 *
 * @api
 */
void dac_lld_put_channel(DACDriver *dacp,
                         dacchannel_t channel,
                         dacsample_t sample) {

  (void)dacp;
  (void)channel;
  (void)sample;
}

/**
 * @brief   Starts a DAC conversion.
 * @details Starts an asynchronous conversion operation.
 * @note    In @p DAC_DHRM_8BIT_RIGHT mode the parameters passed to the
 *          callback are wrong because two samples are packed in a single
 *          dacsample_t element. This will not be corrected, do not rely
 *          on those parameters.
 * @note    In @p DAC_DHRM_8BIT_RIGHT_DUAL mode two samples are treated
 *          as a single 16 bits sample and packed into a single dacsample_t
 *          element. The num_channels must be set to one in the group
 *          conversion configuration structure.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
void dac_lld_start_conversion(DACDriver *dacp) {

  (void)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
 *
 * @iclass
 */
void dac_lld_stop_conversion(DACDriver *dacp) {

  (void)dacp;
}

#endif /* HAL_USE_DAC == TRUE */

/** @} */