Hi,
I have just saw the release note for the 3.21 : "# Added: SD/MMC file caching to increase the speed of file write and file read. Cache buffer size is configured in File_Config.c file. # Added: implementation of FAT32 file system, sub-folders and long file names. Sub-folders and Long File names may be used also with FAT12 or FAT16 file system. "
but I canno't find any folder relative functions in the sourcecode / help files ... I missed something ? :)