/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT 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/RT 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    STM32/ext_lld.h
 * @brief   STM32 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    STM32_EXTI_NUM_CHANNELS

/**
 * @name    STM32-specific EXT channel modes
 * @{
 */
#define EXT_MODE_GPIO_MASK  0xF0        /**< @brief Port field mask.        */
#define EXT_MODE_GPIO_OFF   4           /**< @brief Port field offset.      */
#define EXT_MODE_GPIOA      0x00        /**< @brief GPIOA identifier.       */
#define EXT_MODE_GPIOB      0x10        /**< @brief GPIOB identifier.       */
#define EXT_MODE_GPIOC      0x20        /**< @brief GPIOC identifier.       */
#define EXT_MODE_GPIOD      0x30        /**< @brief GPIOD identifier.       */
#define EXT_MODE_GPIOE      0x40        /**< @brief GPIOE identifier.       */
#define EXT_MODE_GPIOF      0x50        /**< @brief GPIOF identifier.       */
#define EXT_MODE_GPIOG      0x60        /**< @brief GPIOG identifier.       */
#define EXT_MODE_GPIOH      0x70        /**< @brief GPIOH identifier.       */
#define EXT_MODE_GPIOI      0x80        /**< @brief GPIOI identifier.       */
/** @} */

/*===========================================================================*/
/* 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   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);

/**
 * @brief   Channel configuration structure.
 */
typedef struct {
  /**
   * @brief Channel mode.
   */
  uint32_t              mode;
  /**
   * @brief Channel callback.
   * @details  In the STM32 implementation a @p NULL callback pointer is
   *           valid and configures the channel as an event sources instead
   *           of an interrupt source.
   */
  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_ */

/** @} */