STM32F412 SDIO Tx Underrun error when DMA is enabled.

[LLOLO.1]

Hi!

I am working on a project where I have to drive a SD Card. So far I have successfully implemented the initialization and reading data with DMA part. I am not using HAL libraries. The code to write to external flash is shown below. I did everything according to reference manual.

void SDIO_MEM_Write_SingleBlock512(uint32_t Address, uint32_t* Buffer)
{
	//Single Block Transfer

	//uint8_t Result = 0xFF;
	uint8_t tempCardState;

	SDIO->DLEN = 512;
	SDIO->DTIMER = 0xFFFFFFFF;

	//Configure DMA
	DMA2->LIFCR |= DMA_LIFCR_CTCIF3 | DMA_LIFCR_CHTIF3 | DMA_LIFCR_CTEIF3 | DMA_LIFCR_CFEIF3; //Clear Interrupt Flag

	DMA2_Stream3->CR = 0;
	DMA2_Stream3->CR |= (0b11 << DMA_SxCR_PL_Pos) | DMA_SxCR_MINC | (0b01 << DMA_SxCR_DIR_Pos) | (4 << DMA_SxCR_CHSEL_Pos) | (0b01<<DMA_SxCR_MBURST_Pos) | (0b01<<DMA_SxCR_PBURST_Pos) | (0b10 << DMA_SxCR_MSIZE_Pos) | (0b10 << DMA_SxCR_PSIZE_Pos) | (0b1<<DMA_SxCR_PFCTRL_Pos);
	DMA2_Stream3->PAR  = (uint32_t) &SDIO->FIFO;
	DMA2_Stream3->M0AR = (uint32_t) Buffer; //Memory Address which data will be copied
	DMA2_Stream3->NDTR = 128; // Data to be transfered
	DMA2_Stream3->CR |= DMA_SxCR_EN;

	//Write Single Block Command issued by using CMD24
	SDIO_SendCMD(Address, 24, WAIT_SHRTRESPONS, 0);

	if(SDIO_WaitCMDResponse() != 0xFF)
	{
		while(1);//Error Occurred
	}

	//Get R1 for Analysis
	if((SDIO->RESP1) & 0xFDFFE008) //Card Status
	{
		while(1);//Error Occurred
	}


	SDIO->DCTRL = 0;
	SDIO->DCTRL |= ((BLKSIZE_512 << SDIO_DCTRL_DBLOCKSIZE_Pos) | (TRSFRDIR_HtC << SDIO_DCTRL_DTDIR_Pos) | (TRSFRMOD_BLK << SDIO_DCTRL_DTMODE_Pos) | SDIO_DCTRL_DTEN | SDIO_DCTRL_DMAEN);

	while((SDIO->STA & (SDIO_STA_DBCKEND)) == 0);

	SDIO->ICR = (SDIO_ICR_DBCKENDC | SDIO_ICR_DATAENDC);

	//Wait until write Operation is finished
	do
	{
		if(SDIO_FetchCardState(&tempCardState) != 0xFF)
		{
			while(1);//Error Occurred
		}
	}while(tempCardState == 0x04); //Check Transfer State

	//return Result;
}

The problem is as soon as I enable DMA and SDIO (Line 37) I get Tx FIFO underrun error in SDIO STA register and FIFO error in DMA ISR register. I changed the order of enabling DMA/SDIO but nothing seems to work.

Has anyone encountered this problem?

Thanks.