STM32 F407VGT6 SPI DMA Master

#define BUFFERSIZE_DMA_SPI 100

uint8_t aTxBuffer[BUFFERSIZE_DMA_SPI] = "SPI Master";

uint8_t aRxBuffer[BUFFERSIZE_DMA_SPI];

static void SPI_Config(void) {

  // SPI-Clock enable

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

  // Clock Enable der Pins

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

  /* Enable DMA clock */

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);

  /* Connect SPI pins to AF5 */

  GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);

  GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);

  GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;          

  /* SPI SCK PB13, MISO PB14, MOSI PB15 pin configuration */

  GPIO_InitStructure.GPIO_Pin = GPIO_PinSource13 | GPIO_PinSource14 | GPIO_PinSource15;

  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* SPI configuration -------------------------------------------------------*/

  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

  SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;                  //kein enable NSS-Pin

  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;

  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

  SPI_InitStructure.SPI_CRCPolynomial = 7;

  //SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

  /* DMA configuration -------------------------------------------------------*/

  /* Configure DMA Initialization Structure */

  DMA_InitStructure.DMA_BufferSize = BUFFERSIZE_DMA_SPI;

  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;

  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;

  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;

  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;

  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(SPI2->DR));

  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

  DMA_InitStructure.DMA_Priority = DMA_Priority_High;

  /* Configure TX DMA */

  DMA_InitStructure.DMA_Channel = DMA_Channel_0;

  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;

  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) aTxBuffer;

  DMA_Init(DMA1_Stream4, &DMA_InitStructure);

  /* Configure RX DMA */

  DMA_InitStructure.DMA_Channel = DMA_Channel_0;

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;

  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) aRxBuffer;

  /* Initializes the DMA for communication */

  DMA_Init(DMA1_Stream3, &DMA_InitStructure);

  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

  /* Initializes the SPI communication */

  SPI_Init(SPI2, &SPI_InitStructure);

  /* Enable DMA SPI TX Stream */

  DMA_Cmd(DMA1_Stream4, ENABLE);

  /* Enable DMA SPI RX Stream */

  DMA_Cmd(DMA1_Stream3, ENABLE);

  /* Enable SPI DMA TX Requests */

  SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);

  /* Enable SPI DMA RX Requests */

  SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);

  /* Enable the SPI peripheral */

  SPI_Cmd(SPI2, ENABLE);

}