FAT File System Module

layer

FatFs module is an experimental project to implement a FAT file system to small embdded systems. The FatFs module is written in compliance with ANSI C, therefore it is independent of hardware architecture. It can be incorporated into most 8-bit microcontrollers, such as 8051, PIC, AVR, H8, Z80 and etc..., without any change. I created two modules in different configurations in consideration of various use.

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.

Features of Tiny-FatFs Module (different to FatFs)

  1. Very low memory consumption, suitable for small memory system. (RAM:1KB)
  2. Supports only single drive.

Application Interface

FatFs/Tiny-FatFs module provides following functions.

Disk I/O Interface

Since the FatFs/Tiny-FatFs module is completely separated from disk I/O layer, it requires following functions to lower layer to read/write physical disk and to get current time. These functions must be provided by user. The low level disk I/O module that have this interace must be provided by user. The sample projects are also available.

Resources

The FatFs/Tiny-FatFs module is a free software and is opened for education, research and development. You can use, modify and/or republish it for personal, non-profit or profit use without any restriction under your responsibility.