/*
    ChibiOS - Copyright (C) 2006..2016 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_i2s.h
 * @brief   I2S Driver macros and structures.
 *
 * @addtogroup I2S
 * @{
 */

#ifndef HAL_I2S_H
#define HAL_I2S_H

#if (HAL_USE_I2S == TRUE) || defined(__DOXYGEN__)

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

/**
 * @name    I2S modes
 * @{
 */
#define I2S_MODE_SLAVE          0
#define I2S_MODE_MASTER         1
/** @} */

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

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

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

/**
 * @brief   Driver state machine possible states.
 */
typedef enum {
  I2S_UNINIT = 0,                   /**< Not initialized.                   */
  I2S_STOP = 1,                     /**< Stopped.                           */
  I2S_READY = 2,                    /**< Ready.                             */
  I2S_ACTIVE = 3,                   /**< Active.                            */
  I2S_COMPLETE = 4                  /**< Transmission complete.             */
} i2sstate_t;

#include "hal_i2s_lld.h"

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

/**
 * @name    Macro Functions
 * @{
 */
/**
 * @brief   Starts a I2S data exchange.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 *
 * @iclass
 */
#define i2sStartExchangeI(i2sp) {                                           \
  i2s_lld_start_exchange(i2sp);                                             \
  (i2sp)->state = I2S_ACTIVE;                                               \
}

/**
 * @brief   Stops the ongoing data exchange.
 * @details The ongoing data exchange, if any, is stopped, if the driver
 *          was not active the function does nothing.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 *
 * @iclass
 */
#define i2sStopExchangeI(i2sp) {                                            \
  i2s_lld_stop_exchange(i2sp);                                              \
  (i2sp)->state = I2S_READY;                                                \
}

/**
 * @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] i2sp      pointer to the @p I2CDriver object
 *
 * @notapi
 */
#define _i2s_isr_half_code_tx(i2sp) {                                          \
  if ((i2sp)->config->tx_end_cb != NULL) {                                     \
    (i2sp)->config->tx_end_cb(i2sp, 0, (i2sp)->config->size / 2);              \
  }                                                                         \
}

/**
 * @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] i2sp      pointer to the @p I2CDriver object
 *
 * @notapi
 */
#define _i2s_isr_half_code_rx(i2sp) {                                          \
  if ((i2sp)->config->rx_end_cb != NULL) {                                     \
    (i2sp)->config->rx_end_cb(i2sp, 0, (i2sp)->config->size / 2);              \
  }                                                                         \
}

/**
 * @brief   Common ISR code.
 * @details This code handles the portable part of the ISR code:
 *          - Callback invocation.
 *          - Driver state transitions.
 *          .
 * @note    This macro is meant to be used in the low level drivers
 *          implementation only.
 *
 * @param[in] i2sp      pointer to the @p I2CDriver object
 *
 * @notapi
 */
#define _i2s_isr_full_code_tx(i2sp) {                                               \
  if ((i2sp)->config->tx_end_cb) {                                             \
    (i2sp)->state = I2S_COMPLETE;                                           \
    (i2sp)->config->tx_end_cb(i2sp,                                            \
                           (i2sp)->config->size / 2,                        \
                           (i2sp)->config->size / 2);                       \
    if ((i2sp)->state == I2S_COMPLETE)                                      \
      (i2sp)->state = I2S_READY;                                            \
  }                                                                         \
  else                                                                      \
    (i2sp)->state = I2S_READY;                                              \
}

/**
 * @brief   Common ISR code.
 * @details This code handles the portable part of the ISR code:
 *          - Callback invocation.
 *          - Driver state transitions.
 *          .
 * @note    This macro is meant to be used in the low level drivers
 *          implementation only.
 *
 * @param[in] i2sp      pointer to the @p I2CDriver object
 *
 * @notapi
 */
#define _i2s_isr_full_code_rx(i2sp) {                                               \
  if ((i2sp)->config->rx_end_cb) {                                             \
    (i2sp)->state = I2S_COMPLETE;                                           \
    (i2sp)->config->rx_end_cb(i2sp,                                            \
                           (i2sp)->config->size / 2,                        \
                           (i2sp)->config->size / 2);                       \
    if ((i2sp)->state == I2S_COMPLETE)                                      \
      (i2sp)->state = I2S_READY;                                            \
  }                                                                         \
  else                                                                      \
    (i2sp)->state = I2S_READY;                                              \
}
/** @} */

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

#ifdef __cplusplus
extern "C" {
#endif
  void i2sInit(void);
  void i2sObjectInit(I2SDriver *i2sp);
  void i2sStart(I2SDriver *i2sp, const I2SConfig *config);
  void i2sStop(I2SDriver *i2sp);
  void i2sStartExchange(I2SDriver *i2sp);
  void i2sStopExchange(I2SDriver *i2sp);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_I2S == TRUE */

#endif /* HAL_I2S_H */

/** @} */
