/*
    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_can_lld.c
 * @brief   PLATFORM CAN subsystem low level driver source.
 *
 * @addtogroup CAN
 * @{
 */

#include "hal.h"

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

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

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

/**
 * @brief   CAN1 driver identifier.
 */
#if (PLATFORM_CAN_USE_CAN1 == TRUE) || defined(__DOXYGEN__)
CANDriver CAND1;
#endif

/*===========================================================================*/
/* Driver local variables and types.                                         */
/*===========================================================================*/

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

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

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

/**
 * @brief   Low level CAN driver initialization.
 *
 * @notapi
 */
void can_lld_init(void) {

#if PLATFORM_CAN_USE_CAN1 == TRUE
  /* Driver initialization.*/
  canObjectInit(&CAND1);
#endif
}

/**
 * @brief   Configures and activates the CAN peripheral.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 *
 * @notapi
 */
void can_lld_start(CANDriver *canp) {

  if (canp->state == CAN_STOP) {
    /* Enables the peripheral.*/
#if PLATFORM_CAN_USE_CAN1 == TRUE
    if (&CAND1 == canp) {

    }
#endif
  }
  /* Configures the peripheral.*/

}

/**
 * @brief   Deactivates the CAN peripheral.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 *
 * @notapi
 */
void can_lld_stop(CANDriver *canp) {

  if (canp->state == CAN_READY) {
    /* Resets the peripheral.*/

    /* Disables the peripheral.*/
#if PLATFORM_CAN_USE_CAN1 == TRUE
    if (&CAND1 == canp) {

    }
#endif
  }
}

/**
 * @brief   Determines whether a frame can be transmitted.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 * @param[in] mailbox   mailbox number, @p CAN_ANY_MAILBOX for any mailbox
 *
 * @return              The queue space availability.
 * @retval false        no space in the transmit queue.
 * @retval true         transmit slot available.
 *
 * @notapi
 */
bool can_lld_is_tx_empty(CANDriver *canp, canmbx_t mailbox) {

  (void)canp;

  switch (mailbox) {
  case CAN_ANY_MAILBOX:
    return false;
  case 1:
    return false;
  case 2:
    return false;
  case 3:
    return false;
  default:
    return false;
  }
}

/**
 * @brief   Inserts a frame into the transmit queue.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 * @param[in] ctfp      pointer to the CAN frame to be transmitted
 * @param[in] mailbox   mailbox number,  @p CAN_ANY_MAILBOX for any mailbox
 *
 * @notapi
 */
void can_lld_transmit(CANDriver *canp,
                      canmbx_t mailbox,
                      const CANTxFrame *ctfp) {

  (void)canp;
  (void)mailbox;
  (void)ctfp;

}

/**
 * @brief   Determines whether a frame has been received.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 * @param[in] mailbox   mailbox number, @p CAN_ANY_MAILBOX for any mailbox
 *
 * @return              The queue space availability.
 * @retval false        no space in the transmit queue.
 * @retval true         transmit slot available.
 *
 * @notapi
 */
bool can_lld_is_rx_nonempty(CANDriver *canp, canmbx_t mailbox) {

  (void)canp;
  (void)mailbox;

  switch (mailbox) {
  case CAN_ANY_MAILBOX:
    return false;
  case 1:
    return false;
  case 2:
    return false;
  default:
    return false;
  }
}

/**
 * @brief   Receives a frame from the input queue.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 * @param[in] mailbox   mailbox number, @p CAN_ANY_MAILBOX for any mailbox
 * @param[out] crfp     pointer to the buffer where the CAN frame is copied
 *
 * @notapi
 */
void can_lld_receive(CANDriver *canp,
                     canmbx_t mailbox,
                     CANRxFrame *crfp) {

  (void)canp;
  (void)mailbox;
  (void)crfp;

}

#if (CAN_USE_SLEEP_MODE == TRUE) || defined(__DOXYGEN__)
/**
 * @brief   Enters the sleep mode.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 *
 * @notapi
 */
void can_lld_sleep(CANDriver *canp) {

  (void)canp;

}

/**
 * @brief   Enforces leaving the sleep mode.
 *
 * @param[in] canp      pointer to the @p CANDriver object
 *
 * @notapi
 */
void can_lld_wakeup(CANDriver *canp) {

  (void)canp;

}
#endif /* CAN_USE_SLEEP_MOD == TRUEE */

#endif /* HAL_USE_CAN == TRUE */

/** @} */