nuttx/boards/arm/stm32/omnibusf4/src/stm32_spi.c

/****************************************************************************
 * boards/arm/stm32/omnibusf4/src/stm32_spi.c
 *
 *   Copyright (C) 2019 Bill Gatliff. All rights reserved.
 *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
 *   Author: Bill Gatliff <bgat@billgatliff.com>
 *   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 "chip.h"
#include "stm32.h"

#include "omnibusf4.h"

#if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2) || \
    defined(CONFIG_STM32_SPI3)

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: stm32_spidev_initialize
 *
 * Description:
 *   Called to configure SPI chip select GPIO pins for the omnibusf4 board.
 *
 ****************************************************************************/

void weak_function stm32_spidev_initialize(void)
{
#ifdef CONFIG_STM32_SPI1
  stm32_configgpio(GPIO_CS_MPU6000);
  stm32_configgpio(GPIO_EXTI_MPU6000);
#endif
#ifdef CONFIG_STM32_SPI3
  stm32_configgpio(GPIO_CS_MAX7456);
#endif
#if defined(CONFIG_MMCSD_SPI)
  stm32_configgpio(GPIO_MMCSD_NCD);  /* SD_DET */
  stm32_configgpio(GPIO_MMCSD_NSS);  /* CS */
#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");

  /* Note: CS is active-low. */

  stm32_gpiowrite(GPIO_CS_MPU6000, !selected);
}

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");

  /* Note: NSS is active-low. */

  stm32_gpiowrite(GPIO_MMCSD_NSS, selected ? 0 : 1);
}

uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, uint32_t devid)
{
  /* Note: SD_DET is pulled high when there's no SD card present. */

  return stm32_gpioread(GPIO_MMCSD_NCD) ? 0 : 1;
}
#endif

#ifdef CONFIG_STM32_SPI3
void stm32_spi3select(FAR struct spi_dev_s *dev, uint32_t devid,
                      bool selected)
{
  spiinfo("devid: %d %s\n",
          (int)devid, selected ? "assert" : "de-assert");

  /* Note: MAX7456 CS is active-low. */

  stm32_gpiowrite(GPIO_CS_MAX7456, selected ? 0 : 1);
}

uint8_t stm32_spi3status(FAR struct spi_dev_s *dev, uint32_t devid)
{
  return 0;
}
#endif

#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 || CONFIG_STM32_SPI3 */