text: /****************************************************************************
   * boards/arm/stm32/stm32f103-minimum/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_internal.h"
  #include "chip.h"
  #include "stm32.h"
  #include "stm32f103_minimum.h"
  
  #if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2)
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32_spidev_initialize
   *
   * Description:
   *   Called to configure SPI chip select GPIO pins for the HY-MiniSTM32
   *   board.
   *
   ****************************************************************************/
  
  void stm32_spidev_initialize(void)
  {
    /* NOTE: Clocking for SPI1 and/or SPI2 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.
     */
  
  #ifdef CONFIG_MTD_W25
    stm32_configgpio(FLASH_SPI1_CS);      /* FLASH chip select */
  #endif
  
  #ifdef CONFIG_CAN_MCP2515
    stm32_configgpio(GPIO_MCP2515_CS);    /* MCP2515 chip select */
  #endif
  
  #ifdef CONFIG_CL_MFRC522
    stm32_configgpio(GPIO_CS_MFRC522);    /* MFRC522 chip select */
  #endif
  
  #if defined(CONFIG_SENSORS_MAX6675)
    stm32_configgpio(GPIO_MAX6675_CS);    /* MAX6675 chip select */
  #endif
  
  #ifdef CONFIG_LCD_MAX7219
    stm32_configgpio(STM32_LCD_CS);       /* MAX7219 chip select */
  #endif
  
  #ifdef CONFIG_LCD_ST7567
    stm32_configgpio(STM32_LCD_CS);       /* ST7567 chip select */
  #endif
  
  #ifdef CONFIG_LCD_PCD8544
    stm32_configgpio(STM32_LCD_CS);       /* ST7567 chip select */
  #endif
  
  #ifdef CONFIG_WL_NRF24L01
    stm32_configgpio(GPIO_NRF24L01_CS);         /* nRF24L01 chip select */
  #endif
  
  #ifdef CONFIG_MMCSD_SPI
    stm32_configgpio(GPIO_SDCARD_CS);           /* SD/MMC Card chip select */
  #endif
  }
  
  /****************************************************************************
   * Name:  stm32_spi1/2select and stm32_spi1/2status
   *
   * 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)
  {
  #if defined(CONFIG_CAN_MCP2515)
    if (devid == SPIDEV_CANBUS(0))
      {
        stm32_gpiowrite(GPIO_MCP2515_CS, !selected);
      }
  #endif
  
  #if defined(CONFIG_CL_MFRC522)
    if (devid == SPIDEV_CONTACTLESS(0))
      {
        stm32_gpiowrite(GPIO_CS_MFRC522, !selected);
      }
  #endif
  
  #if defined(CONFIG_SENSORS_MAX6675)
    if (devid == SPIDEV_TEMPERATURE(0))
      {
        stm32_gpiowrite(GPIO_MAX6675_CS, !selected);
      }
  #endif
  
  #ifdef CONFIG_LCD_MAX7219
    if (devid == SPIDEV_DISPLAY(0))
      {
        stm32_gpiowrite(STM32_LCD_CS, !selected);
      }
  #endif
  
  #ifdef CONFIG_LCD_PCD8544
    if (devid == SPIDEV_DISPLAY(0))
      {
        stm32_gpiowrite(STM32_LCD_CS, !selected);
      }
  #endif
  
  #ifdef CONFIG_LCD_ST7567
    if (devid == SPIDEV_DISPLAY(0))
      {
        stm32_gpiowrite(STM32_LCD_CS, !selected);
      }
  #endif
  
  #ifdef CONFIG_WL_NRF24L01
    if (devid == SPIDEV_WIRELESS(0))
      {
        stm32_gpiowrite(GPIO_NRF24L01_CS, !selected);
      }
  #endif
  
  #ifdef CONFIG_MMCSD_SPI
    if (devid == SPIDEV_MMCSD(0))
      {
        stm32_gpiowrite(GPIO_SDCARD_CS, !selected);
      }
  #endif
  
  #ifdef CONFIG_MTD_W25
    stm32_gpiowrite(FLASH_SPI1_CS, !selected);
  #endif
  }
  
  uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    uint8_t status = 0;
  
  #ifdef CONFIG_WL_NRF24L01
    if (devid == SPIDEV_WIRELESS(0))
      {
         status |= SPI_STATUS_PRESENT;
      }
  #endif
  
  #ifdef CONFIG_MMCSD_SPI
    if (devid == SPIDEV_MMCSD(0))
      {
         status |= SPI_STATUS_PRESENT;
      }
  #endif
  
    return status;
  }
  #endif
  
  #ifdef CONFIG_STM32_SPI2
  void stm32_spi2select(FAR struct spi_dev_s *dev, uint32_t devid,
                        bool selected)
  {
  }
  
  uint8_t stm32_spi2status(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)
  {
  #ifdef CONFIG_LCD_ST7567
    if (devid == SPIDEV_DISPLAY(0))
      {
        /*  This is the Data/Command control pad which determines whether the
         *  data bits are data or a command.
         */
  
        stm32_gpiowrite(STM32_LCD_RS, !cmd);
  
        return OK;
      }
  #endif
  
  #ifdef CONFIG_LCD_PCD8544
    if (devid == SPIDEV_DISPLAY(0))
      {
        /*  This is the Data/Command control pad which determines whether the
         *  data bits are data or a command.
         */
  
        stm32_gpiowrite(STM32_LCD_CD, !cmd);
  
        return OK;
      }
  #endif
  
    return -ENODEV;
  }
  #endif
  #endif
  
  #endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 */
  