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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 2<html lang="en"> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 5<meta http-equiv="Content-Style-Type" content="text/css"> 6<link rel="start" title="Site Top" href="../../"> 7<link rel="up" title="Freewares" href="../../fsw_e.html"> 8<link rel="stylesheet" href="css_e.css" type="text/css" media="screen" title="ELM Default"> 9<link rel="stylesheet" href="css_p.css" type="text/css" media="screen" title="ELM Default"> 10<title>ELM - Petit FAT File System Module</title> 11</head> 12 13<body> 14<h1>Petit FAT File System Module</h1> 15<hr> 16 17<div class="abst"> 18<img src="img/layers3.png" class="rset" width="245" height="255" alt="layer"> 19<p>Petit FatFs is a sub-set of FatFs module for tiny 8-bit microcontrollers. It is written in compliance with ANSI C and completely separated from the disk I/O layer. It can be incorporated into the tiny microcontrollers with a small memory even if the RAM size is less than sector size. Full featured FAT file system module is <a href="http://elm-chan.org/fsw/ff/00index_e.html">here</a>.</p> 20 21<h4>Features</h4> 22<ul> 23 <li>Very small RAM consumption (46 bytes work area + certain stack).</li> 24 <li>Very small code size (2K-4K bytes).</li> 25 <li>FAT12, FAT16 and FAT32.</li> 26 <li>Single volume and Single file.</li> 27 <li>File write function with some restrictions.</li> 28</ul> 29</div> 30 31 32<div class="para"> 33<h3>Application Interface</h3> 34<p>Petit FatFs module provides following functions.</p> 35<ul> 36<li><a href="pf/mount.html">pf_mount</a> - Mount/Unmount a Volume</li> 37<li><a href="pf/open.html">pf_open</a> - Open a File</li> 38<li><a href="pf/read.html">pf_read</a> - Read File</li> 39<li><a href="pf/write.html">pf_write</a> - Write File</li> 40<li><a href="pf/lseek.html">pf_lseek</a> - Move R/W Pointer</li> 41<li><a href="pf/opendir.html">pf_opendir</a> - Open a Directory</li> 42<li><a href="pf/readdir.html">pf_readdir</a> - Read a Directory Item</li> 43</ul> 44</div> 45 46 47<div class="para"> 48<h3>Disk I/O Interface</h3> 49<p>Since the Petit FatFs module is completely separated from disk I/O layer, it requires following functions to lower layer to read the physical disk. The low level disk I/O module is not a part of Petit FatFs module and it must be provided by user. The sample drivers are also available in the resources.</p> 50<ul> 51<li><a href="pf/dinit.html">disk_initialize</a> - Initialize disk drive</li> 52<li><a href="pf/dreadp.html">disk_readp</a> - Read partial sector</li> 53<li><a href="pf/dwritep.html">disk_writep</a> - Write partial sector</li> 54</ul> 55</div> 56 57 58<div class="para"> 59<h3>Resources</h3> 60<p>The Petit FatFs module is a free software and is opened for education, research and development. You can use, modify and/or redistribute it for personal, non-profit or commercial use without any restriction under your responsibility. For further information, refer to the application note.</p> 61<ul> 62<li><a href="http://elm-chan.org/fsw/ff/bd/"><em>FatFs User Forum</em></a></li> 63<li><a href="pf/appnote.html">Petit FatFs module application note</a> <span class="mfd">Dec 14, 2009</span></li> 64<li><a href="http://www.microsoft.com/whdc/system/platform/firmware/fatgen.mspx">FAT32 Specification by Microsoft</a> (The reference document on FAT file system)</li> 65<li><a href="http://elm-chan.org/docs/mmc/mmc_e.html">How to Use MMC/SDC</a></li> 66<li><a href="img/rwtest3.png">Benchmark 3</a> (ATtiny85/8MHz with MMC via USI)</li> 67</ul> 68</div> 69 70 71<hr> 72<p class="foot"><a href="../../fsw_e.html">Return</a></p> 73</body> 74</html>