tinySA/os/hal/platforms/STM32/spi_lld.h

/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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/spi_lld.h
 * @brief   STM32 SPI subsystem low level driver header.
 *
 * @addtogroup SPI
 * @{
 */

#ifndef _SPI_LLD_H_
#define _SPI_LLD_H_

#if HAL_USE_SPI || defined(__DOXYGEN__)

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

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

/**
 * @brief   SPI1 driver enable switch.
 * @details If set to @p TRUE the support for SPI1 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_SPI_USE_SPI1) || defined(__DOXYGEN__)
#define STM32_SPI_USE_SPI1                  TRUE
#endif

/**
 * @brief   SPI2 driver enable switch.
 * @details If set to @p TRUE the support for SPI2 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_SPI_USE_SPI2) || defined(__DOXYGEN__)
#define STM32_SPI_USE_SPI2                  TRUE
#endif

/**
 * @brief   SPI3 driver enable switch.
 * @details If set to @p TRUE the support for SPI3 is included.
 * @note    The default is @p TRUE.
 */
#if !defined(STM32_SPI_USE_SPI3) || defined(__DOXYGEN__)
#define STM32_SPI_USE_SPI3                  FALSE
#endif

/**
 * @brief   SPI1 DMA priority (0..3|lowest..highest).
 * @note    The priority level is used for both the TX and RX DMA channels but
 *          because of the channels ordering the RX channel has always priority
 *          over the TX channel.
 */
#if !defined(STM32_SPI_SPI1_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI_SPI1_DMA_PRIORITY         2
#endif

/**
 * @brief   SPI2 DMA priority (0..3|lowest..highest).
 * @note    The priority level is used for both the TX and RX DMA channels but
 *          because of the channels ordering the RX channel has always priority
 *          over the TX channel.
 */
#if !defined(STM32_SPI_SPI2_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI_SPI2_DMA_PRIORITY         2
#endif

/**
 * @brief   SPI3 DMA priority (0..3|lowest..highest).
 * @note    The priority level is used for both the TX and RX DMA channels but
 *          because of the channels ordering the RX channel has always priority
 *          over the TX channel.
 */
#if !defined(STM32_SPI_SPI3_DMA_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI_SPI3_DMA_PRIORITY         2
#endif

/**
 * @brief   SPI1 interrupt priority level setting.
 */
#if !defined(STM32_SPI_SPI1_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI_SPI1_IRQ_PRIORITY         10
#endif

/**
 * @brief   SPI2 interrupt priority level setting.
 */
#if !defined(STM32_SPI_SPI2_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI_SPI2_IRQ_PRIORITY         10
#endif

/**
 * @brief   SPI3 interrupt priority level setting.
 */
#if !defined(STM32_SPI_SPI3_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define STM32_SPI_SPI3_IRQ_PRIORITY         10
#endif

/**
 * @brief   SPI1 DMA error hook.
 * @note    The default action for DMA errors is a system halt because DMA error
 *          can only happen because programming errors.
 */
#if !defined(STM32_SPI_SPI1_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_SPI_SPI1_DMA_ERROR_HOOK()     chSysHalt()
#endif

/**
 * @brief   SPI2 DMA error hook.
 * @note    The default action for DMA errors is a system halt because DMA error
 *          can only happen because programming errors.
 */
#if !defined(STM32_SPI_SPI2_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_SPI_SPI2_DMA_ERROR_HOOK()     chSysHalt()
#endif

/**
 * @brief   SPI3 DMA error hook.
 * @note    The default action for DMA errors is a system halt because DMA error
 *          can only happen because programming errors.
 */
#if !defined(STM32_SPI_SPI3_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_SPI_SPI3_DMA_ERROR_HOOK()     chSysHalt()
#endif

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

#if STM32_SPI_USE_SPI1 && !STM32_HAS_SPI1
#error "SPI1 not present in the selected device"
#endif

#if STM32_SPI_USE_SPI2 && !STM32_HAS_SPI2
#error "SPI2 not present in the selected device"
#endif

#if STM32_SPI_USE_SPI3 && !STM32_HAS_SPI3
#error "SPI3 not present in the selected device"
#endif

#if !STM32_SPI_USE_SPI1 && !STM32_SPI_USE_SPI2 && !STM32_SPI_USE_SPI3
#error "SPI driver activated but no SPI peripheral assigned"
#endif

/*===========================================================================*/
/* 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.
 */
typedef struct {
  /**
   * @brief Operation complete callback or @p NULL.
   */
  spicallback_t         end_cb;
  /* End of the mandatory fields.*/
  /**
   * @brief The chip select line port.
   */
  ioportid_t            ssport;
  /**
   * @brief The chip select line pad number.
   */
  uint16_t              sspad;
  /**
   * @brief SPI initialization data.
   */
  uint16_t              cr1;
} SPIConfig;

/**
 * @brief   Structure representing a SPI driver.
 */
struct SPIDriver{
  /**
   * @brief Driver state.
   */
  spistate_t            state;
  /**
   * @brief Current configuration data.
   */
  const SPIConfig       *config;
#if SPI_USE_WAIT || defined(__DOXYGEN__)
  /**
   * @brief Waiting thread.
   */
  Thread                *thread;
#endif /* SPI_USE_WAIT */
#if SPI_USE_MUTUAL_EXCLUSION || defined(__DOXYGEN__)
#if CH_USE_MUTEXES || defined(__DOXYGEN__)
  /**
   * @brief Mutex protecting the bus.
   */
  Mutex                 mutex;
#elif CH_USE_SEMAPHORES
  Semaphore             semaphore;
#endif
#endif /* SPI_USE_MUTUAL_EXCLUSION */
#if defined(SPI_DRIVER_EXT_FIELDS)
  SPI_DRIVER_EXT_FIELDS
#endif
  /* End of the mandatory fields.*/
  /**
   * @brief Pointer to the SPIx registers block.
   */
  SPI_TypeDef           *spi;
  /**
   * @brief Pointer to the receive DMA channel registers block.
   */
  stm32_dma_channel_t   *dmarx;
  /**
   * @brief Pointer to the transmit DMA channel registers block.
   */
  stm32_dma_channel_t   *dmatx;
  /**
   * @brief DMA priority bit mask.
   */
  uint32_t              dmaccr;
};

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

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

#if STM32_SPI_USE_SPI1 && !defined(__DOXYGEN__)
extern SPIDriver SPID1;
#endif

#if STM32_SPI_USE_SPI2 && !defined(__DOXYGEN__)
extern SPIDriver SPID2;
#endif

#if STM32_SPI_USE_SPI3 && !defined(__DOXYGEN__)
extern SPIDriver SPID3;
#endif

#ifdef __cplusplus
extern "C" {
#endif
  void spi_lld_init(void);
  void spi_lld_start(SPIDriver *spip);
  void spi_lld_stop(SPIDriver *spip);
  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);
  uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame);
#ifdef __cplusplus
}
#endif

#endif /* HAL_USE_SPI */

#endif /* _SPI_LLD_H_ */

/** @} */