Using SD card in TouchGFX/FreeRTOS project

Louie88 · ‎2025-04-03

Hello,

I created an app form my STM32H7474I-DISCO board to test SD card based on this example. I spent a couple of hours with porting it to H747I-DISCO board, but finally it worked: I could save and load a file from an SD Card.

I implemented the whole thing into my TouchGFX based project on same discovery board. I could build and run the project but when I tried to write a new file the SD Card was mounted fine but creating a new file failed with FR_NOT_READY (The physical drive cannot work) error.


uint32_t byteswritten;
  if(f_mount(&SDFatFS, (TCHAR const*)SDPath, 0) != FR_OK)
   {
       Error_Handler();
   }
   else
   {
	   //Open file for writing (Create)
	   if(f_open(&SDFile, "STM32.TXT", FA_CREATE_ALWAYS | FA_WRITE) != FR_OK)
	   {
		   Error_Handler();
	   }
	   else
	   {
		   //Write to the text file
		   res = f_write(&SDFile, wtext, strlen((char *)wtext), (void *)&byteswritten);
		   if((byteswritten == 0) || (res != FR_OK))
		   {
			   Error_Handler();
		   }
		   else
		   {
			   f_close(&SDFile);
		   }
		}
   }

The same code, the same development board, the same SD card works fine if I have no TouchGFX nor FreeTOS. Is this some initializing/usage error or the same code cannot be run under TouchGFX nor FreeTOS?

Thanks,
Louis