REG HANG of AM335x firmware while processing SD command

Shradhanand,

This problem will be observed if wither the controller or card is not properly initialized.

Regards,

Ramesh D

Hi Ramesh,

Thanks for the Info. Here i could see that this is happening when card init is being done. Is there any way to understand if card is initialised properly or not (a way to debug the issue).

Regards,

M.Shradhanand

Shradhanand,

Please debug the status of card and controller for speed, bit mode and check if you get any clues.

Check which DMA operation is failing. Is it when card is performing initialization or read or write operation?

Regards,

Ramesh D

Hi Ramesh,

Presently i have disabled using of DMA. im not using it. Is that the problem? the problem im facing is after the cmd line display which displays all the available commands. then while processing the cmd line (here im giving a input "h"), but still the interrupt routine HSMMCSDIsr() is not invoked. here is where i can see cmdCompFlag = 1; which will enable me to move forward.

Please help me out.

Regards,

Shradhanand

Shradhanand,

The current example will not work without DMA. It requires you to handle the data transfers through interrupts.

Regards,

Ramesh D

Hi Ramesh,

I have tried the same with DMA also. But i could see the two codes hang at the same space. is there any problem with file system fatfs? because this hang happens when it is executing the line

 if(f_opendir(&g_sDirObject, g_cCwdBuf) != FR_OK), which at the end goes continous while loop at 

while ((cmdCompFlag == 0) && (cmdTimeout == 0));

do i need to format ? i have formatted the SD Card also. would there be any problem with filesystem?

These are the steps which i followed for my custom board.

//the below two lines do the work of IntRegister(), IntPrioritySet(), IntSystemEnable(); because am //using RTOS Quadros.

tGOSInterruptDescriptor Des = { HSMMCSDIsr, 20 };

GOS_InterruptChange(SYS_INT_MMCSD0INT, &Des);

/* Perform pin-mux for HSMMCSD pins. */
HSMMCSDPinMuxSetup();

HSMMCSDModuleClkConfig();

HSMMCSDControllerSetup();

/* Initialize the MMCSD controller */

MMCSDCtrlInit(&ctrlInfo);
MMCSDIntEnable(&ctrlInfo);

while(1)
{
if((MMCSDCardPresent(&ctrlInfo)) == 1)
{
if(initFlg)
{
HSMMCSDFsMount(0, &sdCard);
initFlg = 0;
Cmd_help(0, NULL);
}
HSMMCSDFsProcessCmdLine();
}
else
{
// delay(1);
i = (i + 1) & 0xFFF;
if(i == 1)
{
 UARTPuts("Please insert the card \n\r", -1); 
}
if(initFlg != 1)
{
/* Reinitialize all the state variables */
callbackOccured = 0;
xferCompFlag = 0;
dataTimeout = 0;
cmdCompFlag = 0;
cmdTimeout = 0;
/* Initialize the MMCSD controller */
MMCSDCtrlInit(&ctrlInfo);

MMCSDIntEnable(&ctrlInfo);
}

initFlg = 1;
}
}

}

Shradhanand,

Check if you disk has a FAT partition or not.

Regards,

Ramesh D

Hi Ramesh,

a) Im new to file systems. Could you please help me out in knowing the FAT partition. Do i need to have card reader or so? or can i know it using some tool.

b) As i have debugged the issue, i could see that starterware code that i have used is not able to do the card init.

DSTATUS
disk_initialize(
BYTE bValue)

{

.

.

status = MMCSDCardInit(card->ctrl);

.

.

}

Regards,

Shradhanand

Shradhanand,

So in your case Card initialization is failing. Please check that your are using SD card and complaint to ver 2.0. Please trace which step in the initialization sequece causes the issue.

Regards,

Ramesh D

Hi Ramesh,

I could see that the exact line it hangs is "status = MMCSDCardReset(ctrl);" and finally this line

"while ((cmdCompFlag == 0) && (cmdTimeout == 0));" gets hanged.

I have checked My SDCARD is formatted with FAT and it has a FAT partition.

Regards,

Shradhanand

Shradhanand,

Does your SD card support ver 2.0 ? or Something is wrong in initialization.

Regards,

Ramesh D