text: /****************************************************************************
   * boards/arm/max326xx/max32660-evsys/src/max326_spi.c
   *
   *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <stdbool.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/spi/spi.h>
  #include <arch/board/board.h>
  
  #include "arm_arch.h"
  #include "max326_spim.h"
  
  #include "max32660-evsys.h"
  
  #ifdef CONFIG_MAX326XX_HAVE_SPIM
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: max326_spidev_initialize
   *
   * Description:
   *   Called to configure SPI chip select GPIO pins for the MAX3660-EVSYS
   *   board.
   *
   ****************************************************************************/
  
  void max326_spidev_initialize(void)
  {
  #ifdef CONFIG_MAX326XX_SPIM0
  #endif
  #ifdef CONFIG_MAX326XX_SPIM1
  #endif
  }
  
  /****************************************************************************
   * Name:  max326_spi0/1select and max326_spi0/1status
   *
   * Description:
   *   The external functions, max326_spi0/1select and max326_spi0/1status must
   *   be provided by board-specific logic.
   *   They are implementations of the select and status methods of the SPI
   *   interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
   *   All other methods (including max326_spibus_initialize())
   *   are provided by common STM32 logic.
   *   To use this common SPI logic on your board:
   *
   *   1. Provide logic in max326_boardinitialize() to configure SPI chip select
   *      pins.
   *   2. Provide max326_spi0/1select() and max326_spi0/1status() functions in
   *      your board-specific logic.
   *      These functions will perform chip selection and status operations
   *      using GPIOs in the way your board is configured.
   *   3. Add a calls to max326_spibus_initialize() in your low level
   *      application initialization logic
   *   4. The handle returned by max326_spibus_initialize() may then be used to
   *      bind the SPI driver to higher level logic (e.g., calling
   *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
   *      the SPI MMC/SD driver).
   *
   ****************************************************************************/
  
  #ifdef CONFIG_MAX326XX_SPIM0
  void max326_spi0select(FAR struct spi_dev_s *dev, uint32_t devid,
                         bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid,
            selected ? "assert" : "de-assert");
  }
  
  uint8_t max326_spi0status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    return 0;
  }
  #endif
  
  #ifdef CONFIG_MAX326XX_SPIM1
  void max326_spi1select(FAR struct spi_dev_s *dev, uint32_t devid,
                         bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid,
            selected ? "assert" : "de-assert");
  }
  
  uint8_t max326_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    return 0;
  }
  #endif
  
  /****************************************************************************
   * Name: max326_spi0/1cmddata
   *
   * Description:
   *   Set or clear the SH1101A A0 or SD1306 D/C n bit to select data (true)
   *   or command (false). This function must be provided by platform-specific
   *   logic. This is an implementation of the cmddata method of the SPI
   *   interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
   *
   * Input Parameters:
   *
   *   spi - SPI device that controls the bus the device that requires the CMD/
   *         DATA selection.
   *   devid - If there are multiple devices on the bus, this selects which one
   *         to select cmd or data.  NOTE:  This design restricts, for example,
   *         one one SPI display per SPI bus.
   *   cmd - true: select command; false: select data
   *
   * Returned Value:
   *   None
   *
   ****************************************************************************/
  
  #ifdef CONFIG_SPI_CMDDATA
  #ifdef CONFIG_MAX326XX_SPIM0
  int max326_spi0cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
  {
    return -ENODEV;
  }
  #endif
  
  #ifdef CONFIG_MAX326XX_SPIM1
  int max326_spi1cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
  {
    return -ENODEV;
  }
  #endif
  
  #ifdef CONFIG_STM32_SPI3
  int max326_spi3cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
  {
    return -ENODEV;
  }
  #endif
  #endif /* CONFIG_SPI_CMDDATA */
  #endif /* CONFIG_MAX326XX_HAVE_SPIM */
  