Petit Fat File System Module

Re:Petit Fat File System Module by andyjpb on Tuesday October 13, 2020 @03:51PM (#24769583)

I've been using this recently and, because it doesn't ever modify the file system structures, you don't have to worry about unmounting the volume cleanly.

It can write to files, but it can't create or resize them. For that (and more), you want FatFs, the full featured version: http://elm-chan.org/fsw/ff/00index_e.html

elm-chan has also written an AVR bootloader that can update the flash from, for example, an SDCard. It uses this Petit FAT File System Module and requires a 4K bootloader section (so mostly of use on the ATMega1284).

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Re:Petit Fat File System Module by beardyw on Wednesday October 14, 2020 @11:20AM (#24777513)

I have used the Petit version a lot and I love it. But it is not always very efficient because it does no caching. I've done a fix so that when I have 512 bytes to spare it will save the last sector read. It speeds things up a lot without the fixed overheads of the full Fatfs. I probably should offer it up if it's possible.

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