SPI2读取FLASH

只看该作者 · 2019-11-20 14:32

将mini板例程中的SPI-FLASH实验代码的 SPI1 改为 SPI2 后，为什么读取FLASH的ID为0xFF？是下面的配置有问题吗？

void SPI_FLASH_Init(void)
{
  SPI_InitTypeDef  SPI_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable SPI1 and GPIO clocks */
  /*!< SPI_FLASH_SPI_CS_GPIO, SPI_FLASH_SPI_MOSI_GPIO,
   SPI_FLASH_SPI_MISO_GPIO, SPI_FLASH_SPI_DETECT_GPIO
   and SPI_FLASH_SPI_SCK_GPIO Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  /*!< SPI_FLASH_SPI Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

  /*!< Configure SPI_FLASH_SPI pins: SCK */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MISO */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MOSI */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

//       GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15);

  /*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();
  /* SPI1 configuration */
  // W25X16: data input on the DIO pin is sampled on the rising edge of the CLK.
  // Data on the DO and DIO pins are clocked out on the falling edge of CLK.
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
      SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI2, &SPI_InitStructure);
  SPI_Cmd(SPI2, ENABLE);

      SPI_FLASH_SendByte(0xff);

}

SPI2读取FLASH

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