SPI DMA接收问题求助

ajianyes · 发表于 2016-8-30 21:13:19

我目前在做SPI FLASH的DMA方式，数据的发送是正常的，但是一旦启用DMA方式来接收数据就无法接收数据，
while (!DMA_GetFlagStatus(DMA1_FLAG_TC2));一直死在这句，急急急啊源码如下：

void SPI_DMA_TXD(void* buf, u32 DataLen)
{
/* SPI_SLAVE_Rx_DMA_Channel configuration ---------------------------------------------*/
DMA_InitTypeDef  DMA_InitStructure;
DMA_DeInit(DMA1_Channel3);//spi_tx dma channel
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI1->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)buf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = DataLen;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);

// Enable USART1 DMA TX request
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);

// Enable DMA
DMA_Cmd(DMA1_Channel3,ENABLE);
}

void SPI_DMA_RXD(void* buf, u32 DataLen)
{
u8 temp = 0xff;
/* SPI_SLAVE_Rx_DMA_Channel configuration ---------------------------------------------*/
DMA_InitTypeDef  DMA_InitStructure;
DMA_DeInit(DMA1_Channel2);//spi_tx dma channel
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI1->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)buf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = DataLen;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);

DMA_Cmd(DMA1_Channel3,DISABLE);//发送数据前先关闭SPI1 DMA发送通道3
SPI1->DR;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&temp;//发送0xff用于产生时钟
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);
SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
DMA_Cmd(DMA1_Channel2,ENABLE);// Enable DMA
DMA_Cmd(DMA1_Channel3,ENABLE);// Enable DMA
while (!DMA_GetFlagStatus(DMA1_FLAG_TC2));//
DMA_ClearFlag(DMA1_FLAG_TC2);
DMA_ClearFlag(DMA1_FLAG_TC3);
}

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_GPIOA | RCC_APB2Periph_GPIOD, ENABLE);

  /*!< SPI_FLASH_SPI Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  /*!< Configure SPI_FLASH_SPI pins: SCK */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MISO */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MOSI */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &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(SPI1, &SPI_InitStructure);

  /* Enable SPI1  */
  SPI_Cmd(SPI1, ENABLE);
}