| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><meta http-equiv="Content-Style-Type" content="text/css"><link rel="up" title="FatFs" href="../00index_e.html"><link rel="alternate" hreflang="ja" title="Japanese" href="../ja/sfatfs.html"><link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"><title>FatFs - FATFS</title></head><body><div class="para"><h2>FATFS</h2><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, or any data on the FAT volume can be collapsed.</p><pre><span class="k">typedef</span> <span class="k">struct</span> {    BYTE    fs_type;      <span class="c">/* File system type (0, FS_FAT12, FS_FAT16, FS_FAT32 or FS_EXFAT) */</span>    BYTE    drv;          <span class="c">/* Physical drive number */</span>    BYTE    n_fats;       <span class="c">/* Number of FAT copies (1,2) */</span>    BYTE    wflag;        <span class="c">/* win[] flag (b0:win[] is dirty) */</span>    BYTE    fsi_flag;     <span class="c">/* FSINFO flags (b7:Disabled, b0:Dirty) */</span>    WORD    id;           <span class="c">/* File system mount ID */</span>    WORD    n_rootdir;    <span class="c">/* Number of root directory entries (FAT12/16) */</span>    WORD    csize;        <span class="c">/* Sectors per cluster */</span><span class="k">#if</span> _MAX_SS != _MIN_SS    WORD    ssize;        <span class="c">/* Sector size (512,1024,2048 or 4096) */</span><span class="k">#endif</span><span class="k">#if _FS_EXFAT</span>    BYTE*   dirbuf;       <span class="c">/* Directory entry block scratchpad buffer */</span><span class="k">#endif</span><span class="k">#if</span> _FS_REENTRANT    _SYNC_t sobj;         <span class="c">/* Identifier of sync object */</span><span class="k">#endif</span><span class="k">#if</span> !_FS_READONLY    DWORD   last_clust;   <span class="c">/* FSINFO: Last allocated cluster (0xFFFFFFFF if invalid) */</span>    DWORD   free_clust;   <span class="c">/* FSINFO: Number of free clusters (0xFFFFFFFF if invalid) */</span><span class="k">#endif</span><span class="k">#if</span> _FS_RPATH    DWORD   cdir;         <span class="c">/* Cluster number of current directory (0:root) */</span><span class="k">#if _FS_EXFAT</span>    DWORD   cdc_scl;      <span class="c">/* Containing directory start cluster (invalid when cdir is 0) */</span>    DWORD   cdc_size;     <span class="c">/* b31-b8:Size of containing directory, b7-b0: Chain status */</span>    DWORD   cdc_ofs;      <span class="c">/* Offset in the containing directory (invalid when cdir is 0) */</span><span class="k">#endif</span><span class="k">#endif</span>    DWORD   n_fatent;     <span class="c">/* Number of FAT entries (Number of clusters + 2) */</span>    DWORD   fsize;        <span class="c">/* Sectors per FAT */</span>    DWORD   volbase;      <span class="c">/* Volume base LBA */</span>    DWORD   fatbase;      <span class="c">/* FAT base LBA */</span>    DWORD   dirbase;      <span class="c">/* Root directory base (LBA|Cluster) */</span>    DWORD   database;     <span class="c">/* Data base LBA */</span>    DWORD   winsect;      <span class="c">/* Sector LBA appearing in the win[] */</span>    BYTE    win[_MAX_SS]; <span class="c">/* Disk access window for directory, FAT (and file data at tiny cfg) */</span>} FATFS;</pre></div><p class="foot"><a href="../00index_e.html">Return</a></p></body></html>
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