MMC SD Card Interfacing

Introduction to Chan’s Library : MMC SD Card interfacing

►Introduction to Chan’s Library

First of all, if you haven’t downloaded Chan’s source code, you should do this first. You can get from him at this link:

http://elm-chan.org/fsw/ff/00index_e.html

When you unzip this file, use the default directories and you will end up with a directory structure like this:



Chan has included examples for a variety of processors. The basic set of routines are found in the src subdirectory. As he notes in his readme file, the files included here are:

File	Description
ff.h	Common include file for FatFs and application module.
ff.c	FatFs Module
tff.h	Common include file for Tiny-FatFs and application module.
tff.c	Tiny-FatFs module.
diskio.h	Common include file for (Tiny-)FatFs and disk I/O module.
diskio.c	Skeleton of low level disk I/O module.
integer.h	Alternative type definitions for integer variables.

Chan also states that

chan wrote ...

the low level disk I/O module is not included in this archive because the FatFs/Tiny-FatFs module is only a generic file system layer and not dependent on any specific storage device. You have to provide a low level disk I/O module that is written to control your storage device.

That is the intent behind this tutorial – to show you how to write the low level disk I/O module so the file system layer can work properly.