STM32CubeF4的中SPI

void SPIx_Init(void)

{

  if(HAL_SPI_GetState(&hnucleo_Spi) == HAL_SPI_STATE_RESET)

  {

    /* SPI Config */

    hnucleo_Spi.Instance = NUCLEO_SPIx;   // SPI2

      /* SPI baudrate is set to 12,5 MHz maximum (PCLK2/SPI_BaudRatePrescaler = 100/8 = 12,5 MHz) 

       to verify these constraints:

          - ST7735 LCD SPI interface max baudrate is 15MHz for write and 6.66MHz for read

            Since the provided driver doesn't use read capability from LCD, only constraint 

            on write baudrate is considered.

          - SD card SPI interface max baudrate is 25MHz for write/read

          - PCLK2 max frequency is 100 MHz 

       */ 

    hnucleo_Spi.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;

    hnucleo_Spi.Init.Direction = SPI_DIRECTION_2LINES;

    hnucleo_Spi.Init.CLKPhase = SPI_PHASE_1EDGE;

    hnucleo_Spi.Init.CLKPolarity = SPI_POLARITY_LOW;

    hnucleo_Spi.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;

    hnucleo_Spi.Init.CRCPolynomial = 7;

    hnucleo_Spi.Init.DataSize = SPI_DATASIZE_8BIT;

    hnucleo_Spi.Init.FirstBit = SPI_FIRSTBIT_MSB;

    hnucleo_Spi.Init.NSS = SPI_NSS_SOFT;

    hnucleo_Spi.Init.TIMode = SPI_TIMODE_DISABLED;

    hnucleo_Spi.Init.Mode = SPI_MODE_MASTER;



    SPIx_MspInit(&hnucleo_Spi);

    HAL_SPI_Init(&hnucleo_Spi);

  }

}

static void SPIx_MspInit(SPI_HandleTypeDef *hspi)

{

  GPIO_InitTypeDef  GPIO_InitStruct;  

  

  /*** Configure the GPIOs ***/  

  /* Enable GPIO clock */

  NUCLEO_SPIx_SCK_GPIO_CLK_ENABLE();  // Enable GPIOB RCC

  NUCLEO_SPIx_MISO_MOSI_GPIO_CLK_ENABLE();  // // Enable GPIOB RCC

  

  /* Configure SPI SCK */

  GPIO_InitStruct.Pin = NUCLEO_SPIx_SCK_PIN;  // GPIOB_PIN_13

  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

  GPIO_InitStruct.Pull  = GPIO_NOPULL;

  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;

  GPIO_InitStruct.Alternate = NUCLEO_SPIx_SCK_AF;  // 5

  HAL_GPIO_Init(NUCLEO_SPIx_SCK_GPIO_PORT, &GPIO_InitStruct);



  /* Configure SPI MISO and MOSI */ 

  GPIO_InitStruct.Pin = NUCLEO_SPIx_MOSI_PIN;  // GPIOB_PIN_15

  GPIO_InitStruct.Alternate = NUCLEO_SPIx_MISO_MOSI_AF;  // 5

  HAL_GPIO_Init(NUCLEO_SPIx_MISO_MOSI_GPIO_PORT, &GPIO_InitStruct);

  

  GPIO_InitStruct.Pin = NUCLEO_SPIx_MISO_PIN;  // GPIOB_PIN_14

  HAL_GPIO_Init(NUCLEO_SPIx_MISO_MOSI_GPIO_PORT, &GPIO_InitStruct);



  /* Configure SPI NSS */

  GPIO_InitStruct.Pin = GPIO_PIN_12;

  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

  GPIO_InitStruct.Pull  = GPIO_NOPULL;

  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;

  HAL_GPIO_Init(NUCLEO_SPIx_SCK_GPIO_PORT, &GPIO_InitStruct);

  HAL_GPIO_WritePin(NUCLEO_SPIx_SCK_GPIO_PORT, GPIO_PIN_12, GPIO_PIN_RESET);



  /*** Configure the SPI peripheral ***/ 

  /* Enable SPI clock */

  NUCLEO_SPIx_CLK_ENABLE();

}