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<h2>FATFS</h2> | |
<p>The <tt>FATFS</tt> structure holds dynamic work area of individual logical drives. It is given by application program and registerd/unregisterd to the FatFs module with f_mount function. Following members are in standard configuration. There is no member that can be changed from the application program.</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[] dirty flag */</span> | |
BYTE fsi_flag; <span class="c">/* fsinfo dirty flag */</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 != 512 | |
WORD ssize; <span class="c">/* Sector size (512,1024,2048,4096) */</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">/* Last allocated cluster */</span> | |
DWORD free_clust; <span class="c">/* Number of free clusters */</span> | |
DWORD fsi_sector; <span class="c">/* fsinfo sector (FAT32) */</span> | |
<span class="k">#endif</span> | |
<span class="k">#if</span> _FS_RPATH | |
DWORD cdir; <span class="c">/* Current directory 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 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 Data on tiny cfg) */</span> | |
} FATFS; | |
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