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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Procyon AVRlib: fat.c Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.2 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a></div><h1>fat.c</h1><a href="fat_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file fat.c \brief FAT16/32 file system driver. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'fat.c'</span>00005 <span class="comment">// Title : FAT16/32 file system driver</span>00006 <span class="comment">// Author : Pascal Stang</span>00007 <span class="comment">// Date : 11/07/2000</span>00008 <span class="comment">// Revised : 12/12/2000</span>00009 <span class="comment">// Version : 0.3</span>00010 <span class="comment">// Target MCU : ATmega103 (should work for Atmel AVR Series)</span>00011 <span class="comment">// Editor Tabs : 4</span>00012 <span class="comment">//</span>00013 <span class="comment">// This code is based in part on work done by Jesper Hansen for his</span>00014 <span class="comment">// YAMPP MP3 player project.</span>00015 <span class="comment">//</span>00016 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span>00017 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>00018 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>00019 <span class="comment">//</span>00020 <span class="comment">// This code is distributed under the GNU Public License</span>00021 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>00022 <span class="comment">//</span>00023 <span class="comment">//*****************************************************************************</span>00024 00025 00026 <span class="preprocessor">#include <avr/io.h></span>00027 <span class="preprocessor">#include <avr/pgmspace.h></span>00028 <span class="preprocessor">#include <string.h></span>00029 00030 <span class="preprocessor">#include "<a class="code" href="ata_8h.html">ata.h</a>"</span>00031 <span class="preprocessor">#include "<a class="code" href="rprintf_8h.html">rprintf.h</a>"</span>00032 00033 <span class="preprocessor">#include "<a class="code" href="fat_8h.html">fat.h</a>"</span>00034 <span class="preprocessor">#include "<a class="code" href="fatconf_8h.html">fatconf.h</a>"</span>00035 00036 <span class="comment">// globals</span>00037 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *SectorBuffer = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) SECTOR_BUFFER1_ADDR;00038 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *LongNameBuffer = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) LONGNAME_BUFFER_ADDR;00039 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *DirNameBuffer = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) DIRNAME_BUFFER_ADDR;00040 00041 <span class="keyword">struct </span>partrecord PartInfo;00042 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> Fat32Enabled;00043 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> FirstDataSector;00044 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> BytesPerSector;00045 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> SectorsPerCluster;00046 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> FirstFATSector;00047 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> FirstDirSector;00048 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> FileSize;00049 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> FatInCache = 0;00050 00051 <span class="comment">/*************************************************************************/</span>00052 <span class="comment">/*************************************************************************/</span>00053 00054 00055 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatClustToSect(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> clust)00056 {00057 <span class="keywordflow">return</span> ((clust-2) * SectorsPerCluster) + FirstDataSector;00058 }00059 00060 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> fatClusterSize(<span class="keywordtype">void</span>)00061 {00062 <span class="comment">// return the number of sectors in a disk cluster</span>00063 <span class="keywordflow">return</span> SectorsPerCluster;00064 }00065 00066 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> fatInit( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> device)00067 {00068 <span class="comment">//struct partrecord *pr;</span>00069 <span class="keyword">struct </span>bpb710 *bpb;00070 00071 <span class="comment">// read partition table</span>00072 <span class="comment">// TODO.... error checking</span>00073 ataReadSectors(DRIVE0, 0, 1, SectorBuffer);00074 <span class="comment">// map first partition record </span>00075 <span class="comment">// save partition information to global PartInfo</span>00076 PartInfo = *((<span class="keyword">struct </span>partrecord *) ((<span class="keyword">struct </span>partsector *) SectorBuffer)->psPart);00077 <span class="comment">// PartInfo = *pr;</span>00078 00079 <span class="comment">// Read the Partition BootSector</span>00080 <span class="comment">// **first sector of partition in PartInfo.prStartLBA</span>00081 ataReadSectors( DRIVE0, PartInfo.prStartLBA, 1, SectorBuffer );00082 bpb = (<span class="keyword">struct </span>bpb710 *) ((<span class="keyword">struct </span>bootsector710 *) SectorBuffer)->bsBPB;00083 00084 <span class="comment">// setup global disk constants</span>00085 FirstDataSector = PartInfo.prStartLBA;00086 <span class="keywordflow">if</span>(bpb->bpbFATsecs)00087 {00088 <span class="comment">// bpbFATsecs is non-zero and is therefore valid</span>00089 FirstDataSector += bpb->bpbResSectors + bpb->bpbFATs * bpb->bpbFATsecs;00090 }00091 <span class="keywordflow">else</span>00092 {00093 <span class="comment">// bpbFATsecs is zero, real value is in bpbBigFATsecs</span>00094 FirstDataSector += bpb->bpbResSectors + bpb->bpbFATs * bpb->bpbBigFATsecs;00095 }00096 SectorsPerCluster = bpb->bpbSecPerClust;00097 BytesPerSector = bpb->bpbBytesPerSec;00098 FirstFATSector = bpb->bpbResSectors + PartInfo.prStartLBA;00099 00100 <span class="keywordflow">switch</span> (PartInfo.prPartType)00101 {00102 <span class="keywordflow">case</span> PART_TYPE_DOSFAT16:00103 <span class="keywordflow">case</span> PART_TYPE_FAT16:00104 <span class="keywordflow">case</span> PART_TYPE_FAT16LBA:00105 <span class="comment">// first directory cluster is 2 by default (clusters range 2->big)</span>00106 FirstDirSector = CLUST_FIRST;00107 <span class="comment">// push data sector pointer to end of root directory area</span>00108 <span class="comment">//FirstDataSector += (bpb->bpbRootDirEnts)/DIRENTRIES_PER_SECTOR;</span>00109 Fat32Enabled = FALSE;00110 <span class="keywordflow">break</span>;00111 <span class="keywordflow">case</span> PART_TYPE_FAT32LBA:00112 <span class="keywordflow">case</span> PART_TYPE_FAT32:00113 <span class="comment">// bpbRootClust field exists in FAT32 bpb710, but not in lesser bpb's</span>00114 FirstDirSector = bpb->bpbRootClust;00115 <span class="comment">// push data sector pointer to end of root directory area</span>00116 <span class="comment">// need this? FirstDataSector += (bpb->bpbRootDirEnts)/DIRENTRIES_PER_SECTOR;</span>00117 Fat32Enabled = TRUE;00118 <span class="keywordflow">break</span>;00119 <span class="keywordflow">default</span>:00120 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Found: No Partition!\r\n"</span>);00121 <span class="comment">//return 1;</span>00122 <span class="keywordflow">break</span>;00123 }00124 00125 00126 <span class="preprocessor">#ifdef DEBUG_FAT</span>00127 <span class="preprocessor"></span> <span class="keywordflow">switch</span> (PartInfo.prPartType)00128 {00129 <span class="keywordflow">case</span> PART_TYPE_DOSFAT16:00130 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Found: DOSFAT 16\r\n"</span>);00131 <span class="keywordflow">break</span>;00132 <span class="keywordflow">case</span> PART_TYPE_FAT16:00133 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Found: FAT16\r\n"</span>);00134 <span class="keywordflow">break</span>;00135 <span class="keywordflow">case</span> PART_TYPE_FAT16LBA:00136 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Found: FAT16 LBA\r\n"</span>);00137 <span class="keywordflow">break</span>;00138 <span class="keywordflow">case</span> PART_TYPE_FAT32LBA:00139 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Found: FAT32 LBA\r\n"</span>);00140 <span class="keywordflow">break</span>;00141 <span class="keywordflow">case</span> PART_TYPE_FAT32:00142 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Found: FAT32\r\n"</span>);00143 <span class="comment">//return 1; </span>00144 <span class="keywordflow">break</span>;00145 <span class="keywordflow">default</span>:00146 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Found: No Partition!\r\n"</span>);00147 <span class="comment">//return 1;</span>00148 <span class="keywordflow">break</span>;00149 }00150 00151 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"First sector : "</span>); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(PartInfo.prStartLBA); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00152 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Size : "</span>); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(PartInfo.prSize); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00153 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"bytes/sector : "</span>); <a class="code" href="group__rprintf.html#ga8">rprintfu16</a>(bpb->bpbBytesPerSec); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00154 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"sectors/cluster : "</span>); <a class="code" href="group__rprintf.html#ga7">rprintfu08</a>(bpb->bpbSecPerClust); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00155 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"reserved sectors: "</span>); <a class="code" href="group__rprintf.html#ga8">rprintfu16</a>(bpb->bpbResSectors); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00156 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"FatSectors : "</span>); <a class="code" href="group__rprintf.html#ga8">rprintfu16</a>(bpb->bpbFATsecs); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00157 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"BigFatSectors : "</span>); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(bpb->bpbBigFATsecs); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00158 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Number of Fats : "</span>); <a class="code" href="group__rprintf.html#ga7">rprintfu08</a>(bpb->bpbFATs); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00159 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"First Fat Sector: "</span>); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(FirstFATSector); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00160 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"First Data Sect : "</span>); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(FirstDataSector); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00161 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"First Dir Clust : "</span>); <a class="code" href="group__rprintf.html#ga9">rprintfu32</a>(FirstDirSector); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();00162 <span class="preprocessor">#endif</span>00163 <span class="preprocessor"></span>00164 <span class="keywordflow">return</span> 0; 00165 }00166 <span class="comment"></span>00167 <span class="comment">//////////////////////////////////////////////////////////////</span>00168 <span class="comment"></span>00169 00170 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> baseentry = 0;00171 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> entrycount = 0;00172 00173 00174 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> fatGetDirEntry(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> entry, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count)00175 {00176 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> sector;00177 <span class="keyword">struct </span>direntry *de = 0; <span class="comment">// avoid compiler warning by initializing</span>00178 <span class="keyword">struct </span>winentry *we;00179 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hasBuffer;00180 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> b;00181 <span class="keywordtype">int</span> i,index;00182 <span class="keywordtype">char</span> *p;⌨️ 快捷键说明
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