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TM4C1294NCPDT: RTOS/TM4C1294: Long file name

Arthur ke
Intellectual 320 points
Part Number: TM4C1294NCPDT

Hi all,

I want to read long file name for USB flash drive using TM4C1294.

The sample codes show as below.

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DIR dirs;
FILINFO finfo;
char path[255] ;
TCHAR lfname[_MAX_LFN];
if (f_opendir(&dirs, path) == FR_OK)
{
finfo.lfname = lfname;
finfo.lfsize = _MAX_LFN - 1;
if(f_readdir(&dirs, &finfo) == FR_OK)
{
if(!finfo.fname[0])
{
UartPrintf("No Data\n");
return;
}
UartPrintf("File fn: %s\n",finfo.fname);
UartPrintf("File lfn: %s\n",finfo.lfname);
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

I can read the correct fname but the lfname is always show "???????" .

In the ffconf.h setting I modified some define value.

#define _USE_LFN 2

Should I set any other define value to let the lfname working?

Thanks for your help

Best Regards

Arthur

  • 0
    TI__Guru*** 134975 points

    Hello Arthur,

    From what I see on the included documentation for the FatFs library used in TivaWare, LFN is not supported:

    Features of FatFs Module

    1. Separated buffer for FAT structure and each file, suitable for fast multiple file accsess.
    2. Supports multiple drives/partitions.
    3. Supports FAT12, FAT16(+FAT64) and FAT32. (FAT64: FAT16 in 64KB/cluster)
    4. Supports 8.3 format file name and NT lower case flag. (LFN is not supported)
    5. Supports two partitioning rules: FDISK and Super-floppy.
    6. Optimized for 8/16-bit microcontrollers.

    It may be possible to get this support with a newer version of FatFs but what comes with TivaWare would seem to be unable to support that feature.

    You can find this documentation at [Install Path]\TivaWare_C_Series-2.2.0.295\third_party\fatfs\doc\00index_e.html

    Best Regards,

    Ralph Jacobi