<!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.</p> <pre> <span class="k">typedef</span> <span class="k">struct</span> { BYTE fs_type; <span class="c">/* FAT sub-type (0:Not mounted) */</span> BYTE drv; <span class="c">/* Physical drive number */</span> BYTE csize; <span class="c">/* Sectors per cluster (1,2,4,...,128) */</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> <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</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 */</span> DWORD free_clust; <span class="c">/* FSINFO: Number of free clusters */</span> <span class="k">#endif</span> <span class="k">#if</span> _FS_RPATH DWORD cdir; <span class="c">/* Current directory start cluster (0:root) */</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 start sector */</span> DWORD fatbase; <span class="c">/* FAT area start sector */</span> DWORD dirbase; <span class="c">/* Root directory area start sector (FAT32: Cluster#) */</span> DWORD database; <span class="c">/* Data area start sector */</span> DWORD winsect; <span class="c">/* Current sector 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>