does a 32GByte ultra SD work in FatFS ?

[Trevor Jones]

I have a shiny new Samsung EVO 32GB formated as 29.8GB Fat32

will it work ?

I have a H743

tried the FatFS application

it doesn't find the card.

FATFS_LinkDriver fails

[Tesla DeLorean]

Should do, ClockDiv should be constrained by driver code. FATFS_LinkDriver is before the file system touches it.

Any other cards working? Card Present signal?

[Tesla DeLorean]

Don't reformat or use mkfs on the card

[Trevor Jones]

Its a new card, I only save 2 text files .

no other cards here.

what value should we have for ClockDiv?

I have the SDMMC1.2 clock source set to 48MHz,

[Tesla DeLorean]

Probably going to constrain it to 4 down stream. The SDMMC unit should typically clock at 200 MHz, likely limiting wire clock to 25 MHz

Make sure the TRANSCEIVER option is disabled in stm32h7xx_hal_conf.h if you don't actually have one.

CubeMX generated?

[Trevor Jones]

not cube generated,, hacked an application in the repository...

I have a cube file but not sure the correct way to initialize it to read a file into ram.

[Trevor Jones]

gets stuck here in the cube file:

   if(f_mount(&fs, "", 1))

   {

      f_open(&file, "sample1.txt", FA_WRITE | FA_CREATE_ALWAYS); // < --- stuck here

[Tesla DeLorean]

f_mount, f_open, f_read

Link Layer failing precedes all that though

[Tesla DeLorean]

Likely stuck elsewhere...

Figure out what it is spinning on, and that you have IRQ handlers, etc.

EVAL example will be using the transceiver.

You have a debug uart? which/pins?

[Trevor Jones]

set SDMMC1.2 clock to 200MHz

added this, but now it wont compile.

"

Error      undefined reference to `FS_FileOperations'   H743_LCD_2   C:\Users\DAVE\STM32Cube\Repository\STM32Cube_FW_H7_V1.5.0\Projects\H743-144-LCD1\Src\bios.c   250   

		if(FATFS_LinkDriver(&SD_Driver, SDPath) == 0)
	{
		FRESULT res;
 
		res = f_mkfs(SDPath, FM_ANY, 0, workBuffer, sizeof(workBuffer));
 
		if (res != FR_OK)
		{
			Error_Handler();
		}
      
		FS_FileOperations();
	}
 
	/* Unlink SD diskio driver */
	FATFS_UnLinkDriver(SDPath);