uint8_t DispBuff[]={0xFF,0xFF,0xFF,0xFF,0xFF};
void Init_SPI2()
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_StructInit(&GPIO_InitStructure);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);

GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_SetBits(GPIOB,GPIO_Pin_12);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

SPI_InitTypeDef SPI_InitTypeDefStruct;

SPI_InitTypeDefStruct.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitTypeDefStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitTypeDefStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitTypeDefStruct.SPI_CPOL = SPI_CPOL_High;
SPI_InitTypeDefStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitTypeDefStruct.SPI_NSS = SPI_NSS_Soft;
SPI_InitTypeDefStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitTypeDefStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitTypeDefStruct.SPI_CRCPolynomial = 0;

SPI_Init(SPI2, &SPI_InitTypeDefStruct);

SPI_Cmd(SPI2, ENABLE);

SPI_NSSInternalSoftwareConfig(SPI1, SPI_NSSInternalSoft_Set);

DMA_InitTypeDef DMA_ini;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);

DMA_ini.DMA_Channel = DMA_Channel_0;
DMA_ini.DMA_PeripheralBaseAddr = (uint32_t)&(SPI2->DR);
DMA_ini.DMA_Memory0BaseAddr = (uint32_t)DispBuff;
DMA_ini.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_ini.DMA_BufferSize = sizeof(DispBuff);
DMA_ini.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_ini.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_ini.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_ini.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_ini.DMA_Mode = DMA_Mode_Normal;
DMA_ini.DMA_Priority = DMA_Priority_Medium;
DMA_ini.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_ini.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
DMA_ini.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_ini.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA1_Stream4, &DMA_ini);

SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Tx, ENABLE);

}

int main()
{
Init_SPI2();

while(1)
{

GPIO_ResetBits(GPIOB, GPIO_Pin_12);
DMA_Cmd(DMA1_Stream4, ENABLE);
GPIO_SetBits(GPIOB, GPIO_Pin_12);
int i=0;
while(i<100)
i++;
}
}