...
/* SPI_MASTER configuration ------------------------------------------------*/
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_2;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = CRCPolynomial;
SPI_Init(SPI_MASTER, &SPI_InitStructure);

/* SPI_MASTER_Rx_DMA_Channel configuration ---------------------------------*/
DMA_DeInit(SPI_MASTER_Rx_DMA_Channel);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI_MASTER_DR_Base;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI_MASTER_Buffer_Rx;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = BufferSize;
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_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(SPI_MASTER_Rx_DMA_Channel, &DMA_InitStructure);

/* SPI_MASTER_Tx_DMA_Channel configuration ---------------------------------*/
DMA_DeInit(SPI_MASTER_Tx_DMA_Channel);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI_MASTER_DR_Base;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI_MASTER_Buffer_Tx;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_Init(SPI_MASTER_Tx_DMA_Channel, &DMA_InitStructure);

/* Enable SPI_MASTER DMA Tx request */
SPI_I2S_DMACmd(SPI_MASTER, SPI_I2S_DMAReq_Tx, ENABLE);
/* Enable SPI_MASTER DMA Rx request */
SPI_I2S_DMACmd(SPI_MASTER, SPI_I2S_DMAReq_Rx, ENABLE);

/* Enable SPI_MASTER CRC calculation */
SPI_CalculateCRC(SPI_MASTER, ENABLE);

/* Enable SPI_MASTER */
SPI_Cmd(SPI_MASTER, ENABLE);

/* Enable DMA channels */
DMA_Cmd(SPI_MASTER_Rx_DMA_Channel, ENABLE);
DMA_Cmd(SPI_MASTER_Tx_DMA_Channel, ENABLE);

/* Transfer complete */
while(!DMA_GetFlagStatus(SPI_MASTER_Rx_DMA_FLAG));
while(!DMA_GetFlagStatus(SPI_MASTER_Tx_DMA_FLAG));

... а что дальше?

{
for(int k=0;k<255;k++)
{ data[k]=k;
buffSPI_Tx[k]=k;
buffSPI_Rx[k]=0;
buff[k]=0;
}
init_DMA_SPI();

//начало записи
buffSPI_Tx[0]=WREN;
buffSPI_Tx[1]=WRITE;
buffSPI_Tx[2]=0x00;
buffSPI_Tx[3]=0x00;
buffSPI_Tx[4]=0x00;


SPI_FLASH_CS_LOW();
TX_DMA_SPI();

SPI_FLASH_CS_HIGH();
//конец записи
//начало чтения
buffSPI_Tx[0]=READ;
buffSPI_Tx[1]=0x00;
buffSPI_Tx[2]=0x00;
buffSPI_Tx[3]=0x00;

DMA2_Channel1->CNDTR = 256;
DMA2_Channel2->CNDTR = 256;
SPI_FLASH_CS_LOW();
TX_DMA_SPI();
SPI_FLASH_CS_HIGH();
//конец чтения

buffSPI_Rx[3]=0x00; //контрольный
buff[0]=0; //

}


а теперь функция:

void TX_DMA_SPI(void)
{


DMA_Cmd(DMA2_Channel2,ENABLE);
DMA_Cmd(DMA2_Channel1,ENABLE);
while(!DMA_GetFlagStatus(DMA2_FLAG_TC2));

DMA_ClearITPendingBit(DMA2_IT_TC2);
//DMA_ClearITPendingBit(DMA2_IT_TC1|DMA2_IT_GL1|DMA2_IT_HT1);

DMA_Cmd(DMA2_Channel2,DISABLE);
DMA_Cmd(DMA2_Channel1,DISABLE);

}