text: /****************************************************************************
   * configs/nucleo-f4x1re/src/stm32_spi.c
   *
   *   Copyright (C) 2014 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 <debug.h>
  #include <errno.h>
  
  #include <nuttx/spi/spi.h>
  #include <arch/board/board.h>
  
  #include "up_arch.h"
  #include "chip.h"
  #include "stm32.h"
  
  #include "nucleo-f4x1re.h"
  
  #if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2) || defined(CONFIG_STM32_SPI3)
  
  /************************************************************************************
   * Public Data
   ************************************************************************************/
  /* Global driver instances */
  
  #ifdef CONFIG_STM32_SPI1
  struct spi_dev_s *g_spi1;
  #endif
  #ifdef CONFIG_STM32_SPI2
  struct spi_dev_s *g_spi2;
  #endif
  
  /************************************************************************************
   * Public Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Name: stm32_spidev_initialize
   *
   * Description:
   *   Called to configure SPI chip select GPIO pins for the Nucleo-F401RE and
   *   Nucleo-F411RE boards.
   *
   ************************************************************************************/
  
  void weak_function stm32_spidev_initialize(void)
  {
  #ifdef CONFIG_STM32_SPI1
    /* Configure SPI-based devices */
  
    g_spi1 = stm32_spibus_initialize(1);
    if (!g_spi1)
      {
        spierr("ERROR: FAILED to initialize SPI port 1\n");
      }
  
  #ifdef CONFIG_WL_CC3000
    stm32_configgpio(GPIO_SPI_CS_WIFI);
  #endif
  
  #ifdef HAVE_MMCSD
    stm32_configgpio(GPIO_SPI_CS_SD_CARD);
  #endif
  #endif
  
  #ifdef CONFIG_STM32_SPI2
    /* Configure SPI-based devices */
  
    g_spi2 = stm32_spibus_initialize(2);
  
    /* Setup CS, EN & IRQ line IOs */
  
  #ifdef CONFIG_WL_CC3000
    stm32_configgpio(GPIO_WIFI_CS);
    stm32_configgpio(GPIO_WIFI_EN);
    stm32_configgpio(GPIO_WIFI_INT);
  #endif
  #endif
  }
  
  /****************************************************************************
   * Name:  stm32_spi1/2/3select and stm32_spi1/2/3status
   *
   * Description:
   *   The external functions, stm32_spi1/2/3select and stm32_spi1/2/3status 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 stm32_spibus_initialize())
   *   are provided by common STM32 logic.  To use this common SPI logic on your
   *   board:
   *
   *   1. Provide logic in stm32_boardinitialize() to configure SPI chip select
   *      pins.
   *   2. Provide stm32_spi1/2/3select() and stm32_spi1/2/3status() 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 stm32_spibus_initialize() in your low level application
   *      initialization logic
   *   4. The handle returned by stm32_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_STM32_SPI1
  void stm32_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
  
  #ifdef CONFIG_WL_CC3000
    if (devid == SPIDEV_WIRELESS(0))
      {
        stm32_gpiowrite(GPIO_SPI_CS_WIFI, !selected);
      }
    else
  #endif
  #ifdef HAVE_MMCSD
    if (devid == SPIDEV_MMCSD(0))
      {
        stm32_gpiowrite(GPIO_SPI_CS_SD_CARD, !selected);
      }
  #endif
  }
  
  uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    return 0;
  }
  #endif
  
  #ifdef CONFIG_STM32_SPI2
  void stm32_spi2select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
  
  #ifdef CONFIG_WL_CC3000
    if (devid == SPIDEV_WIRELESS(0))
      {
        stm32_gpiowrite(GPIO_WIFI_CS, !selected);
      }
  #endif
  }
  
  uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    return 0;
  }
  #endif
  
  #ifdef CONFIG_STM32_SPI3
  void stm32_spi3select(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 stm32_spi3status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    return 0;
  }
  #endif
  
  /****************************************************************************
   * Name: stm32_spi1cmddata
   *
   * 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_STM32_SPI1
  int stm32_spi1cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
  {
    return OK;
  }
  #endif
  
  #ifdef CONFIG_STM32_SPI2
  int stm32_spi2cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
  {
    return OK;
  }
  #endif
  
  #ifdef CONFIG_STM32_SPI3
  int stm32_spi3cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
  {
    return OK;
  }
  #endif
  #endif /* CONFIG_SPI_CMDDATA */
  
  #endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 || CONFIG_STM32_SPI3 */
  