How to manage to r/w on USB flash drives with GPT format

[migmel]

I am working USB classes with my STM32F469I discovery and for HOST MSC class have problems to have my program recognize any USB flash drive with GPT format. I have been able to exchange data only with MBR format USB devices.

Can anybody give me some light on what might be the problem as the examples provided by STMicroelectronics have the same issues? Thank you for your kind help

[Tesla DeLorean]

Does the ST code read the blocks/sectors properly?

How those are utilized will depend on the level of file system, and partition, support afforded by the FatFS middleware..

[migmel]

Thank you for your answer.

I omitted to say that I am newbie, so I followed some examples and used the basic fatFS functions to access the drive.

I cannot manage yet to read blocks/sectors or how to do it differently depending on the drive format

Here is a copy of the main app thread:

__NO_RETURN void app_main (void *arg) {

 usbStatus usb_status;         // USB status

 int32_t  msc_status;         // MSC status

 FILE   *f;             // Pointer to stream object

 uint8_t  con = 0U;          // Connection status of MSC(s)

  

 fsStatus result;

  

 LED_Initialize ();          // Initialize LEDs   

  

 (void)arg;

 usb_status = USBH_Initialize (0U);  // Initialize USB Host 0

 if (usb_status != usbOK) {

  for (;;) {}             // Handle USB Host 0 init failure

 }

 for (;;) {

  msc_status = USBH_MSC_DriveGetMediaStatus ("U0:"); // Get MSC device status

  if (msc_status == USBH_MSC_OK) {

LED_On (3U);           // Switch LED4 on

   if (con == 0U) {         // If stick was not connected previously

    con = 1U;            // Stick got connected

    msc_status = USBH_MSC_DriveMount ("U0:");

    if (msc_status != USBH_MSC_OK) {

     continue;           // Handle U0: mount failure

    }

    f = fopen ("Practice-02.txt", "w");  // Open/create file for writing

    if (f == NULL) {

     continue;           // Handle file opening/creation failure

    }

    fprintf (f, "This is the content of Practice-02.txt");

    fclose (f);           // Close file

result = fmkdir("DIR1");

if(result!=fsOK) {

continue;

}

    f = fopen ("/DIR1/Dir1File.txt", "w");  // Open/create file for writing

    if (f == NULL) {

     continue;           // Handle file opening/creation failure

    }

    fprintf (f, "This file is supposed to be located at DIR1");

    fclose (f); 

    f = fopen ("/DIR1/SUBDIR1/Dir1Subdir1File.txt", "w");  // Open/create file for writing

    if (f == NULL) {

     continue;           // Handle file opening/creation failure

    }

    fprintf (f, "This file is supposed to be located inside SUBDIR1");

    fclose (f); 

result = fmkdir("DIR2");

if(result!=fsOK) {

continue;

}

    msc_status = USBH_MSC_DriveUnmount ("U0:");

    if (msc_status != USBH_MSC_OK) {

     continue;           // Handle U0: dismount failure

    }

   }

  } else {

LED_Off (3U);           // Switch LED4 on

   if (con == 1U) {         // If stick was connected previously

    con = 0U;            // Stick got disconnected

   }

  }

  osDelay(100U);

 }

}

[waclawek.jan]

GUID partition support is a relatively recent addition to fatfs, check your version:

R0.14 (October 14, 2019)

Added support for 64-bit LBA and GUID partition table (FF_LBA64)

It also needs to be enabled by an appropriate configuration option http://elm-chan.org/fsw/ff/doc/appnote.html#lba64

JW

[migmel]

Thank you for the information. I will investigate more on this and try to see how it goes.