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

/****************************************************************************
 * boards/arm/stm32/shenzhou/src/stm32_spi.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you 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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <stdbool.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 "shenzhou.h"

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

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

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

void weak_function stm32_spidev_initialize(void)
{
  /* NOTE: Clocking for SPI1 and/or SPI3 was already provided in stm32_rcc.c.
   *       Configurations of SPI pins is performed in stm32_spi.c.
   *       Here, we only initialize chip select pins unique to the board
   *       architecture.
   */

  /* SPI1 connects to the SD CARD and to the SPI FLASH */

#ifdef CONFIG_STM32_SPI1
  stm32_configgpio(GPIO_SD_CS);       /* SD card chip select */
  stm32_configgpio(GPIO_SD_CD);       /* SD card detect */
  stm32_configgpio(GPIO_FLASH_CS);    /* FLASH chip select */
#endif

  /* SPI3 connects to TFT LCD module and the RF24L01 2.4G wireless module */

#ifdef CONFIG_STM32_SPI3
  stm32_configgpio(GPIO_TP_CS);       /* Touchscreen chip select */
  stm32_configgpio(GPIO_LCDDF_CS);    /* Data flash chip select (on the LCD module) */
  stm32_configgpio(GPIO_LCDSD_CS);    /* SD chip select (on the LCD module) */
  stm32_configgpio(GPIO_WIRELESS_CS); /* Wireless chip select */
#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");

  /* SPI1 connects to the SD CARD and to the SPI FLASH */

  if (devid == SPIDEV_MMCSD(0))
    {
      /* Set the GPIO low to select and high to de-select */

      stm32_gpiowrite(GPIO_SD_CS, !selected);
    }
  else if (devid == SPIDEV_FLASH(0))
    {
      /* Set the GPIO low to select and high to de-select */

      stm32_gpiowrite(GPIO_FLASH_CS, !selected);
    }
}

uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
{
  /* The card detect pin is pulled up so that we detect the presence of a
   * card by see a low value on the input pin.
   */

  if (stm32_gpioread(GPIO_SD_CD))
    {
      return 0;
    }

  return SPI_STATUS_PRESENT;
}
#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");

  /* SPI3 connects to TFT LCD (for touchscreen and SD) and the RF24L01 2.4G
   * wireless module.
   */

  if (devid == SPIDEV_TOUCHSCREEN(0))
    {
      /* Set the GPIO low to select and high to de-select */

      stm32_gpiowrite(GPIO_TP_CS, !selected);
    }
  else if (devid == SPIDEV_MMCSD(0))
    {
      /* Set the GPIO low to select and high to de-select */

      stm32_gpiowrite(GPIO_LCDDF_CS, !selected);
    }
  else if (devid == SPIDEV_FLASH(0))
    {
      /* Set the GPIO low to select and high to de-select */

      stm32_gpiowrite(GPIO_LCDSD_CS, !selected);
    }
  else if (devid == SPIDEV_WIRELESS(0))
    {
      /* Set the GPIO low to select and high to de-select */

      stm32_gpiowrite(GPIO_WIRELESS_CS, !selected);
    }
}

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

#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI3 */