fatfs/doc/en/sfatfs.html

   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="up" title="FatFs" href="../00index_e.html">
   7 <link rel="alternate" hreflang="ja" title="Japanese" href="../ja/sfatfs.html">
   8 <link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
   9 <title>FatFs - FATFS</title>
  10 </head>
  11
  12 <body>
  13
  14 <div class="para">
  15 <h2>FATFS</h2>
  16 <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>
  17 <pre>
  18 <span class="k">typedef</span> <span class="k">struct</span> {
  19     BYTE    fs_type;      <span class="c">/* FAT sub-type (0:Not mounted) */</span>
  20     BYTE    drv;          <span class="c">/* Physical drive number */</span>
  21     BYTE    csize;        <span class="c">/* Sectors per cluster (1,2,4,...,128) */</span>
  22     BYTE    n_fats;       <span class="c">/* Number of FAT copies (1,2) */</span>
  23     BYTE    wflag;        <span class="c">/* win[] flag (b0:win[] is dirty) */</span>
  24     BYTE    fsi_flag;     <span class="c">/* FSINFO flags (b7:Disabled, b0:Dirty) */</span>
  25     WORD    id;           <span class="c">/* File system mount ID */</span>
  26     WORD    n_rootdir;    <span class="c">/* Number of root directory entries (FAT12/16) */</span>
  27 <span class="k">#if</span> _MAX_SS != _MIN_SS
  28     WORD    ssize;        <span class="c">/* Sector size (512,1024,2048 or 4096) */</span>
  29 <span class="k">#endif</span>
  30 <span class="k">#if</span> _FS_REENTRANT
  31     _SYNC_t sobj;         <span class="c">/* Identifier of sync object */</span>
  32 <span class="k">#endif</span>
  33 <span class="k">#if</span> !_FS_READONLY
  34     DWORD   last_clust;   <span class="c">/* FSINFO: Last allocated cluster */</span>
  35     DWORD   free_clust;   <span class="c">/* FSINFO: Number of free clusters */</span>
  36 <span class="k">#endif</span>
  37 <span class="k">#if</span> _FS_RPATH
  38     DWORD   cdir;         <span class="c">/* Current directory start cluster (0:root) */</span>
  39 <span class="k">#endif</span>
  40     DWORD   n_fatent;     <span class="c">/* Number of FAT entries (== Number of clusters + 2) */</span>
  41     DWORD   fsize;        <span class="c">/* Sectors per FAT */</span>
  42     DWORD   volbase;      <span class="c">/* Volume start sector */</span>
  43     DWORD   fatbase;      <span class="c">/* FAT area start sector */</span>
  44     DWORD   dirbase;      <span class="c">/* Root directory area start sector (FAT32: Cluster#) */</span>
  45     DWORD   database;     <span class="c">/* Data area start sector */</span>
  46     DWORD   winsect;      <span class="c">/* Current sector appearing in the win[] */</span>
  47     BYTE    win[_MAX_SS]; <span class="c">/* Disk access window for directory, FAT (and file data at tiny cfg) */</span>
  48 } FATFS;
  49 </pre>
  50 </div>
  51
  52 <p class="foot"><a href="../00index_e.html">Return</a></p>
  53 </body>
  54 </html>