55 lines
3.2 KiB
HTML
55 lines
3.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="FatFs" href="../00index_e.html">
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<link rel="alternate" hreflang="ja" title="Japanese" href="../ja/sfatfs.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - FATFS</title>
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</head>
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<body>
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<div class="para">
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<h2>FATFS</h2>
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<p>The <tt>FATFS</tt> structure (file system object) holds dynamic work area of individual logical drives. It is given by application program and registerd/unregisterd to the FatFs module with <tt>f_mount()</tt> function. Initialization is done on first API call after <tt>f_mount()</tt> function or media change. Application program must not modify any member in this structure.</p>
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<pre>
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<span class="k">typedef</span> <span class="k">struct</span> {
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BYTE fs_type; <span class="c">/* FAT sub-type (0:Not mounted) */</span>
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BYTE drv; <span class="c">/* Physical drive number */</span>
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BYTE csize; <span class="c">/* Sectors per cluster (1,2,4,...,128) */</span>
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BYTE n_fats; <span class="c">/* Number of FAT copies (1,2) */</span>
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BYTE wflag; <span class="c">/* win[] flag (b0:win[] is dirty) */</span>
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BYTE fsi_flag; <span class="c">/* FSINFO flags (b7:Disabled, b0:Dirty) */</span>
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WORD id; <span class="c">/* File system mount ID */</span>
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WORD n_rootdir; <span class="c">/* Number of root directory entries (FAT12/16) */</span>
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<span class="k">#if</span> _MAX_SS != _MIN_SS
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WORD ssize; <span class="c">/* Sector size (512,1024,2048 or 4096) */</span>
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<span class="k">#endif</span>
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<span class="k">#if</span> _FS_REENTRANT
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_SYNC_t sobj; <span class="c">/* Identifier of sync object */</span>
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<span class="k">#endif</span>
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<span class="k">#if</span> !_FS_READONLY
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DWORD last_clust; <span class="c">/* FSINFO: Last allocated cluster */</span>
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DWORD free_clust; <span class="c">/* FSINFO: Number of free clusters */</span>
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<span class="k">#endif</span>
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<span class="k">#if</span> _FS_RPATH
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DWORD cdir; <span class="c">/* Current directory start cluster (0:root) */</span>
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<span class="k">#endif</span>
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DWORD n_fatent; <span class="c">/* Number of FAT entries (== Number of clusters + 2) */</span>
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DWORD fsize; <span class="c">/* Sectors per FAT */</span>
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DWORD volbase; <span class="c">/* Volume start sector */</span>
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DWORD fatbase; <span class="c">/* FAT area start sector */</span>
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DWORD dirbase; <span class="c">/* Root directory area start sector (FAT32: Cluster#) */</span>
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DWORD database; <span class="c">/* Data area start sector */</span>
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DWORD winsect; <span class="c">/* Current sector appearing in the win[] */</span>
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BYTE win[_MAX_SS]; <span class="c">/* Disk access window for directory, FAT (and file data at tiny cfg) */</span>
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} FATFS;
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</pre>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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