tinySA/os/hal/include/dac.h

/*
    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.

    This file is part of ChibiOS.

    ChibiOS 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 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.h
 * @brief   DAC Driver macros and structures.
 *
 * @addtogroup DAC
 * @{
 */

#ifndef _DAC_H_
#define _DAC_H_

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

/*===========================================================================*/
/* Driver constants.                                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Driver pre-compile time settings.                                         */
/*===========================================================================*/

/**
 * @name    DAC configuration options
 * @{
 */
/**
 * @brief   Enables synchronous APIs.
 * @note    Disabling this option saves both code and data space.
 */
#if !defined(DAC_USE_WAIT) || defined(__DOXYGEN__)
#define DAC_USE_WAIT                TRUE
#endif

/**
 * @brief   Enables the @p dacAcquireBus() and @p dacReleaseBus() APIs.
 * @note    Disabling this option saves both code and data space.
 */
#if !defined(DAC_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define DAC_USE_MUTUAL_EXCLUSION    TRUE
#endif
/** @} */

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

/*===========================================================================*/
/* Driver data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   Driver state machine possible states.
 */
typedef enum {
  DAC_UNINIT = 0,                   /**< Not initialized.                   */
  DAC_STOP = 1,                     /**< Stopped.                           */
  DAC_READY = 2,                    /**< Ready.                             */
  DAC_ACTIVE = 3,                   /**< Exchanging data.                   */
  DAC_COMPLETE = 4,                 /**< Asynchronous operation complete.   */
  DAC_ERROR = 5 			        /**< Error.                             */
} dacstate_t;

#include "dac_lld.h"

/*===========================================================================*/
/* Driver macros.                                                            */
/*===========================================================================*/

/**
 * @name    Low level driver helper macros
 * @{
 */
#if (DAC_USE_WAIT == TRUE) || defined(__DOXYGEN__)
/**
 * @brief   Waits for operation completion.
 * @details This function waits for the driver to complete the current
 *          operation.
 * @pre     An operation must be running while the function is invoked.
 * @note    No more than one thread can wait on a DAC driver using
 *          this function.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
#define _dac_wait_s(dacp) osalThreadSuspendS(&(dacp)->thread)

/**
 * @brief   Resumes a thread waiting for a conversion completion.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
#define _dac_reset_i(dacp) osalThreadResumeI(&(dacp)->thread, MSG_RESET)

/**
 * @brief   Resumes a thread waiting for a conversion completion.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
#define _dac_reset_s(dacp) osalThreadResumeS(&(dacp)->thread, MSG_RESET)

/**
 * @brief   Wakes up the waiting thread.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
#define _dac_wakeup_isr(dacp) {                                             \
  osalSysLockFromISR();                                                     \
  osalThreadResumeI(&(dacp)->thread, MSG_OK);                               \
  osalSysUnlockFromISR();                                                   \
}

/**
 * @brief   Wakes up the waiting thread with a timeout message.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
#define _dac_timeout_isr(dacp) {                                            \
  osalSysLockFromISR();                                                     \
  osalThreadResumeI(&(dacp)->thread, MSG_TIMEOUT);                          \
  osalSysUnlockFromISR();                                                   \
}

#else /* !DAC_USE_WAIT */
#define _dac_wait_s(dacp)
#define _dac_reset_i(dacp)
#define _dac_reset_s(dacp)
#define _dac_wakeup_isr(dacp)
#define _dac_timeout_isr(dacp)
#endif /* !DAC_USE_WAIT */

/**
 * @brief   Common ISR code, half buffer event.
 * @details This code handles the portable part of the ISR code:
 *          - Callback invocation.
 *          .
 * @note    This macro is meant to be used in the low level drivers
 *          implementation only.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
#define _dac_isr_half_code(dacp) {                                          \
  if ((dacp)->grpp->end_cb != NULL) {                                       \
    (dacp)->grpp->end_cb(dacp, (dacp)->samples, (dacp)->depth / 2);         \
  }                                                                         \
}

/**
 * @brief   Common ISR code, full buffer event.
 * @details This code handles the portable part of the ISR code:
 *          - Callback invocation.
 *          - Waiting thread wakeup, if any.
 *          - Driver state transitions.
 *          .
 * @note    This macro is meant to be used in the low level drivers
 *          implementation only.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 *
 * @notapi
 */
#define _dac_isr_full_code(dacp) {                                          \
  if ((dacp)->grpp->circular) {                                             \
    /* Callback handling.*/                                                 \
    if ((dacp)->grpp->end_cb != NULL) {                                     \
      if ((dacp)->depth > 1) {                                              \
        /* Invokes the callback passing the 2nd half of the buffer.*/       \
        size_t half = (dacp)->depth / 2;                                    \
        size_t half_index = half * (dacp)->grpp->num_channels;              \
        (dacp)->grpp->end_cb(dacp, (dacp)->samples + half_index, half);     \
      }                                                                     \
      else {                                                                \
        /* Invokes the callback passing the whole buffer.*/                 \
        (dacp)->grpp->end_cb(dacp, (dacp)->samples, (dacp)->depth);         \
      }                                                                     \
    }                                                                       \
  }                                                                         \
  else {                                                                    \
    /* End conversion.*/                                                    \
    dac_lld_stop_conversion(dacp);                                          \
    if ((dacp)->grpp->end_cb != NULL) {                                     \
      (dacp)->state = DAC_COMPLETE;                                         \
      if ((dacp)->depth > 1) {                                              \
        /* Invokes the callback passing the 2nd half of the buffer.*/       \
        size_t half = (dacp)->depth / 2;                                    \
        size_t half_index = half * (dacp)->grpp->num_channels;              \
        (dacp)->grpp->end_cb(dacp, (dacp)->samples + half_index, half);     \
      }                                                                     \
      else {                                                                \
        /* Invokes the callback passing the whole buffer.*/                 \
        (dacp)->grpp->end_cb(dacp, (dacp)->samples, (dacp)->depth);         \
      }                                                                     \
      if ((dacp)->state == DAC_COMPLETE) {                                  \
        (dacp)->state = DAC_READY;                                          \
        (dacp)->grpp = NULL;                                                \
      }                                                                     \
    }                                                                       \
    else {                                                                  \
      (dacp)->state = DAC_READY;                                            \
      (dacp)->grpp = NULL;                                                  \
    }                                                                       \
    _dac_wakeup_isr(dacp);                                                  \
  }                                                                         \
}

/**
 * @brief   Common ISR code, error event.
 * @details This code handles the portable part of the ISR code:
 *          - Callback invocation.
 *          - Waiting thread timeout signaling, if any.
 *          - Driver state transitions.
 *          .
 * @note    This macro is meant to be used in the low level drivers
 *          implementation only.
 *
 * @param[in] dacp      pointer to the @p DACDriver object
 * @param[in] err       platform dependent error code
 *
 * @notapi
 */
#define _dac_isr_error_code(dacp, err) {                                    \
  dac_lld_stop_conversion(dacp);                                            \
  if ((dacp)->grpp->error_cb != NULL) {                                     \
    (dacp)->state = DAC_ERROR;                                              \
    (dacp)->grpp->error_cb(dacp, err);                                      \
    if ((dacp)->state == DAC_ERROR)                                         \
      (dacp)->state = DAC_READY;                                            \
  }                                                                         \
  (dacp)->grpp = NULL;                                                      \
  _dac_timeout_isr(dacp);                                                   \
}
/** @} */

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#ifdef __cplusplus
extern "C" {
#endif
  void dacInit(void);
  void dacObjectInit(DACDriver *dacp);
  void dacStart(DACDriver *dacp, const DACConfig *config);
  void dacStop(DACDriver *dacp);
  void dacStartConversion(DACDriver *dacp, const DACConversionGroup *grpp,
                          const dacsample_t *samples, size_t depth);
  void dacStartConversionI(DACDriver *dacp, const DACConversionGroup *grpp,
                           const dacsample_t *samples, size_t depth);
  void dacStopConversion(DACDriver *dacp);
  void dacStopConversionI(DACDriver *dacp);
#if DAC_USE_WAIT
  msg_t dacConvert(DACDriver *dacp, const DACConversionGroup *grpp,
                   const dacsample_t *samples, size_t depth);
#endif
#if DAC_USE_MUTUAL_EXCLUSION
  void dacAcquireBus(DACDriver *dacp);
  void dacReleaseBus(DACDriver *dacp);
#endif
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_DAC == TRUE */

#endif /* _DAC_H_ */

/** @} */