Posted on May 30, 2012 at 01:55I am new in developing firmware by using STM32L152VBT6. I need to configure DMA to transfer data from SRAM to SD Card. The data would be {1, 2, 3, 4, 5, 6, 7, 8, 9, 0}. However, I could not write into SD Card and I could not find any problem about it.
DMA_InitTypeDef DMA_TestStructure;
//Enables the DMA1 peripheral clock.
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
SD_Init();
SD_CS_LOW();
DMA_DeInit(DMA1_Channel5);
DMA_TestStructure.DMA_PeripheralBaseAddr = (uint32_t)SD_SPI_DR;
DMA_TestStructure.DMA_MemoryBaseAddr = (uint32_t)write_data;
DMA_TestStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_TestStructure.DMA_BufferSize = 10;
DMA_TestStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_TestStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_TestStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_TestStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_TestStructure.DMA_Mode = DMA_Mode_Normal;
DMA_TestStructure.DMA_Priority = DMA_Priority_High;
DMA_TestStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_TestStructure);
SPI_I2S_DMACmd(SD_SPI, SPI_I2S_DMAReq_Tx, ENABLE);
SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, write_add, 0xFF);
if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
{
/*!< Send a dummy byte */
SD_WriteByte(SD_DUMMY_BYTE);
/*!< Send the data token to signify the start of the data */
SD_WriteByte(0xFE);
DMA_Cmd(DMA1_Channel5, ENABLE);
while (!DMA_GetFlagStatus(DMA1_FLAG_TC5));
SD_ReadByte();
SD_ReadByte();
/* Read data response */
if (SD_GetDataResponse() == SD_DATA_OK)
{
rvalue = SD_RESPONSE_NO_ERROR;
}
}
SD_CS_HIGH();
SD_WriteByte(SD_DUMMY_BYTE);
DMA_Cmd(DMA1_Channel5, DISABLE);
#dma-spi-stm32-sd
