hal_spi_lld.h

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/*
    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_spi_lld.h
 * @brief   PLATFORM SPI subsystem low level driver header.
 *
 * @addtogroup SPI
 * @{
 */

#ifndef HAL_SPI_LLD_H
#define HAL_SPI_LLD_H

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

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

/**
 * @brief   Circular mode support flag.
 */
#define SPI_SUPPORTS_CIRCULAR           TRUE

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

/**
 * @name    PLATFORM configuration options
 * @{
 */
/**
 * @brief   SPI1 driver enable switch.
 * @details If set to @p TRUE the support for SPI1 is included.
 * @note    The default is @p FALSE.
 */
#if !defined(PLATFORM_SPI_USE_SPI1) || defined(__DOXYGEN__)
#define PLATFORM_SPI_USE_SPI1                  FALSE
#endif
/** @} */

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

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

/**
 * @brief   Type of a structure representing an SPI driver.
 */
typedef struct SPIDriver SPIDriver;

/**
 * @brief   SPI notification callback type.
 *
 * @param[in] spip      pointer to the @p SPIDriver object triggering the
 *                      callback
 */
typedef void (*spicallback_t)(SPIDriver *spip);

/**
 * @brief   Driver configuration structure.
 * @note    Implementations may extend this structure to contain more,
 *          architecture dependent, fields.
 */
typedef struct {
#if (SPI_SUPPORTS_CIRCULAR == TRUE) || defined(__DOXYGEN__)
  /**
   * @brief   Enables the circular buffer mode.
   */
  bool                      circular;
#endif
  /**
   * @brief Operation complete callback or @p NULL.
   */
  spicallback_t             end_cb;
#if (SPI_SELECT_MODE == SPI_SELECT_MODE_LINE) || defined(__DOXYGEN__)
  /**
   * @brief The chip select line.
   */
  ioline_t                  ssline;
#endif
#if (SPI_SELECT_MODE == SPI_SELECT_MODE_PORT) || defined(__DOXYGEN__)
  /**
   * @brief The chip select port.
   */
  ioportid_t                ssport;
  /**
   * @brief The chip select port mask.
   */
  ioportmask_t              ssmask;
#endif
#if (SPI_SELECT_MODE == SPI_SELECT_MODE_PAD) || defined(__DOXYGEN__)
  /**
   * @brief The chip select port.
   */
  ioportid_t                ssport;
  /**
   * @brief The chip select pad number.
   */
  uint_fast8_t              sspad;
#endif
  /* End of the mandatory fields.*/
} SPIConfig;

/**
 * @brief   Structure representing an SPI driver.
 * @note    Implementations may extend this structure to contain more,
 *          architecture dependent, fields.
 */
struct SPIDriver {
  /**
   * @brief Driver state.
   */
  spistate_t                state;
  /**
   * @brief Current configuration data.
   */
  const SPIConfig           *config;
#if (SPI_USE_WAIT == TRUE) || defined(__DOXYGEN__)
  /**
   * @brief   Waiting thread.
   */
  thread_reference_t        thread;
#endif
#if (SPI_USE_MUTUAL_EXCLUSION == TRUE) || defined(__DOXYGEN__)
  /**
   * @brief   Mutex protecting the peripheral.
   */
  mutex_t                   mutex;
#endif
#if defined(SPI_DRIVER_EXT_FIELDS)
  SPI_DRIVER_EXT_FIELDS
#endif
  /* End of the mandatory fields.*/
};

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

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

#if (PLATFORM_SPI_USE_SPI1 == TRUE) && !defined(__DOXYGEN__)
extern SPIDriver SPID1;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void spi_lld_init(void);
  void spi_lld_start(SPIDriver *spip);
  void spi_lld_stop(SPIDriver *spip);
#if (SPI_SELECT_MODE == SPI_SELECT_MODE_LLD) || defined(__DOXYGEN__)
  void spi_lld_select(SPIDriver *spip);
  void spi_lld_unselect(SPIDriver *spip);
#endif
  void spi_lld_select(SPIDriver *spip);
  void spi_lld_unselect(SPIDriver *spip);
  void spi_lld_ignore(SPIDriver *spip, size_t n);
  void spi_lld_exchange(SPIDriver *spip, size_t n,
                        const void *txbuf, void *rxbuf);
  void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf);
  void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf);
#if (SPI_SUPPORTS_CIRCULAR == TRUE) || defined(__DOXYGEN__)
  void spi_lld_abort(SPIDriver *spip);
#endif
  uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_SPI == TRUE */

#endif /* HAL_SPI_LLD_H */

/** @} */