How to make the USB capacity size equal to the flash size?

[WenLiYong]

      Now I'm developping a USB MSC project, the Nand flash size is 4GB,  I don't know how to set USB capaticy size.

     I change the setting in nrf_serial_flash_params.c:                  

   static const nrf_serial_flash_params_t m_sflash_params[] = {
    {   
        .read_id = { 0x00, 0x2C, 0x35 },    // 4G new ver
        .capabilities = 0x00,
        .size = 512 * 1024 * 1024,
        .erase_size = 4 * 1024,
        .program_size = 256,    
    }
};

     But I found the U: size is always 16MB. after plug into PC.

     Please advise how to change USB capaticy size?

Best Regards

Yong

[Sigurd]

Hi,

WenLiYong said:

But I found the U: size is always 16MB. after plug into PC.

Please try to format the disk. Right click on your U: drive, and click "Format.."

[WenLiYong]

Hi,

    Yes, I have clicked "Format", but it still show 16MB,  I want to know whether it should change other setting except for m_sflash_params?

Best Regards

Yong

[WenLiYong]

Hi, Sigurd,

   Thank you.

   My flash is GD5F4G. Size state is 4Gb (512MBytes).

   static const nrf_serial_flash_params_t m_sflash_params[] = {
    {   
        .read_id = { 0x00, 0x2C, 0x35 },    // 4G new ver
        .capabilities = 0x00,
        .size = 512 * 1024 * 1024,
        .erase_size = 4 * 1024,
        .program_size = 256,    
    }

   It's always return 'FR_MKFS_ABORTED' error and log "Mkfs failed."after call f_mkfs() function.

   Please advice.

Best Regards

Yong

[Sigurd]

What parameters are you using in f_mkfs() ? Something like this?

Snippet:

    static uint8_t buf[512];
    ff_result = f_mkfs("", FM_FAT, 1024, buf, sizeof(buf));

[WenLiYong]

Hi Sigurd,

     Thank you,

     Yes, the parameters in f_mkfs() is so, I only changed the .read_id and .size, not change other.

      Could you help to make a test that only change .size of flash_params, You will find the f_mkfs() is fail while the .size is larger than 64M.

Best Regards

Yong

[WenLiYong]

I made a test:

     static uint8_t buf[512];
    ff_result = f_mkfs("", FM_FAT, 8196, buf, sizeof(buf));

    change 1024 to 8196, the f_mkfs() can work normal.

    But I don't know whether there are any other defect?

[Sigurd]

WenLiYong said:

change 1024 to 8196, the f_mkfs() can work normal.

 Great. Maybe your Nand 4GB flash only support 8196 allocation units, or maybe it has something to do with how it's formatted.