/*
    ChibiOS/RT - Copyright (C) 2006-2013 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    LPC8xx/ext_lld.h
 * @brief   LPC8xx EXT subsystem low level driver header.
 *
 * @addtogroup EXT
 * @{
 */

#ifndef _EXT_LLD_H_
#define _EXT_LLD_H_

#if HAL_USE_EXT || defined(__DOXYGEN__)

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

/**
 * @brief   Available number of EXT channels.
 */
#define EXT_MAX_CHANNELS    8

/**
 * @brief   Mask of the available channels.
 */
#define EXT_CHANNELS_MASK   ((1 << EXT_MAX_CHANNELS) - 1)

/** @} */

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

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

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

/**
 * @brief   EXT channel identifier.
 */
typedef uint32_t expchannel_t;

/**

 * @brief   EXT channel callback reason.
 */
typedef uint32_t expreason_t;

/**
 * @brief   Type of an EXT generic notification callback.
 *
 * @param[in] extp      pointer to the @p EXPDriver object triggering the
 *                      callback
 */
typedef void (*extcallback_t)(EXTDriver *extp,
                              expchannel_t channel,
                              expreason_t reason);

/**
 * @brief   Channel configuration structure.
 */
typedef struct {
  /**
   * @brief Channel mode.
   */
  uint8_t              mode;
  /**
   * @brief IO Pin.
   */
  uint8_t              iopin;
  /**
   * @brief Channel callback.
   */
  extcallback_t         cb;
} EXTChannelConfig;

/**
 * @brief   Driver configuration structure.
 * @note    It could be empty on some architectures.
 */
typedef struct {
  /**
   * @brief Channel configurations.
   */
  EXTChannelConfig      channels[EXT_MAX_CHANNELS];
  /* End of the mandatory fields.*/
} EXTConfig;

/**
 * @brief   Structure representing an EXT driver.
 */
struct EXTDriver {
  /**
   * @brief Driver state.
   */
  extstate_t                state;
  /**
   * @brief Current configuration data.
   */
  const EXTConfig           *config;
  /* End of the mandatory fields.*/
};

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

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

#if !defined(__DOXYGEN__)
extern EXTDriver EXTD1;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void ext_lld_init(void);
  void ext_lld_start(EXTDriver *extp);
  void ext_lld_stop(EXTDriver *extp);
  void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel);
  void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_EXT */

#endif /* _EXT_LLD_H_ */

/** @} */
