usb disk error problem in stm32f105rb?

[sprak.2]

hi Im using stm32f105rb mcu to read files from usb using fatfs libraries and i am able to read upto 17 files simultaneously more than that will shoot a disk error. what will be the root cause and is it possible to read more then 50 files simultaneously pls help...

[Tesla DeLorean]

Check things like stack, buffers and setting in FatFs.

Make sure you have space for each file instance.

Instrument DISKIO layer to see what's happening there.

I could see this churning the FAT Table a lot, but that could be managed.

You need 50 files open ​why? Surely a more rational solution can be found?

[sprak.2]

thanks for response... im reading file from usb and storing in a buffer and clearing it and again open file from usb. Here not exact 50 files just for a example. i need to read files continuously without disk error

 void usb_data(char * fname)
 {
 
    int *fss;     
   fss = USBH_malloc(sizeof (fs));  
	 
	   memset(file_buffer,0,sizeof(file_buffer));
	res = f_open(&fil, fname,FA_OPEN_EXISTING | FA_READ);
		if (res!=FR_OK)
		{
			HAL_UART_Transmit(&huart1,file_err,sizeof(file_err),100);
		
		}
		else{
			HAL_UART_Transmit(&huart1,file_open,sizeof(file_open),100);
		}
		HAL_Delay(50);
 
		res=f_read(&fil,file_buffer,f_size(&fil),&test);
		if (res!=FR_OK)
		{
			HAL_UART_Transmit(&huart1,read_error,sizeof(read_error),100);
			
		}
		else{
				HAL_UART_Transmit(&huart1,"\r\n read   success        ",20,100);
		}
		
		
 
	
		HAL_UART_Transmit(&huart1,"\r\n file  closed...",20,100);
	   		for(vall=0;vall<=sizeof(file_buffer)-1;vall++)
		{
			buf=0;
			if(file_buffer[vall]==0x24)
			{
				
					for(va=vall;va<=sizeof(file_buffer)-1;va++)
				{
				myBuff[buf]=file_buffer[va];
					HAL_UART_Transmit(&huart1,&myBuff[buf],1,100);	
				
					if(myBuff[buf]==0x0a)
					{
						break;
					}
					buf++;
			}
		}
	}
			f_close(&fil);
		USBH_free(fss);

[Tesla DeLorean]

Ok, so forget FATFS for a moment and diagnose why the read sector code fails with an error.​