SDIO dma not working

[pedro23]

With DMA it hangs on SD_WaitReadOperation(); With polling it is ok. Btw, any speed adventage polling vs dma?

 void NVIC_Configuration_SD(void)
{
   NVIC_InitTypeDef NVIC_InitStructure;
 
   // Configure the NVIC Preemption Priority Bits
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
 	// SDIO Interrupt ENABLE
   NVIC_InitStructure.NVIC_IRQChannel = SDIO_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
   // DMA2 STREAMx Interrupt ENABLE
   NVIC_InitStructure.NVIC_IRQChannel = SD_SDIO_DMA_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
   NVIC_Init(&NVIC_InitStructure);
}
 
void main(void)
{
 
System_Setup();
  
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
 
SD_Init();
NVIC_Configuration_SD();
int Status;
uint16_t Error;
for(int i=0;i<125;i++)
{
  
  Debugprintf("Sector: %d",i);
  Status = SD_ReadBlock ( (uint8_t *) Scr, i<<9, 512);
  Status = SD_WaitReadOperation();
  while(SD_GetStatus() != SD_TRANSFER_OK);
  Debugprintf("   RD Status: %d",Status);
  Error=0;
  for(int j=0;j<512;j++)
      if(((uint8_t *) Scr)[i]!=(i+1))
         Error++;
   if(Error)
     {
      Debugprintf("   RD Error: %d",Error);
      memset((uint8_t *) Scr,i+1,512);
      do 
         {
          Status=SD_WriteBlock ( (uint8_t *) Scr, i<<9 , 512);
          Status = SD_WaitWriteOperation();
          while(SD_GetStatus() != SD_TRANSFER_OK);
          Debugprintf("   WR Status: %d",Status);
         }while(Status);
     } 
    else 
      Debugprintf("   NO ERROR");              
}
while(1)
  IWDG_ReloadCounter();

[pedro23]

Adding more information it calls SDIO_IRQHandler but it is not calling SD_SDIO_DMA_IRQHANDLER interrupt

void SDIO_IRQHandler(void)
{
	SD_ProcessIRQ();
}
 
void SD_SDIO_DMA_IRQHANDLER(void)
{
	SD_ProcessDMAIRQ();
}

[Tesla DeLorean]

What part?

Double check IRQ Handler name and linkage via .MAP file and inspection of vector table.

Inspect peripheral registers for DMA, SDIO and RCC in debugger.

Review DMA unit/channel settings and initialization

Check if SDIO IRQ firing for transfer actually completing

Advantage of DMA is that it isn't affected by interrupt loading, and less affected by bus loading against LTDC traffic.

[pedro23]

I have been checking and all seems ok

Yes, SDIO IRQ fires with error SD_RX_OVERRUN when reading, than then it hangs on SD_WaitReadOperation here:

while(((SDIO->STA & SDIO_FLAG_RXACT)) && (timeout > 0))
  {
    timeout--;
  }
 

[pedro23 · Accepted solution]

Ok then problem was the buffer that i was using, its address was 0x10000400 instead of a 0x200xxxxx address