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<title>Petit FatFs - FATFS</title>
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<div class="para">
<h2>FATFS</h2>
<p>The <tt>FATFS</tt> structure holds dynamic work area of the logical drive and a file. It is given by application program and registerd/unregisterd to the Petit FatFs module with pf_mount function. There is no member that can be changed by application programs.</p>
<pre>
typedef struct {
BYTE fs_type; <span class="c">/* FAT sub type */</span>
BYTE csize; <span class="c">/* Number of sectors per cluster */</span>
BYTE flag; <span class="c">/* File status flags */</span>
BYTE pad1;
WORD n_rootdir; <span class="c">/* Number of root directory entries (0 on FAT32) */</span>
CLUST n_fatent; <span class="c">/* Number of FAT entries (= number of clusters + 2) */</span>
DWORD fatbase; <span class="c">/* FAT start sector */</span>
DWORD dirbase; <span class="c">/* Root directory start sector (Cluster# on FAT32) */</span>
DWORD database; <span class="c">/* Data start sector */</span>
DWORD fptr; <span class="c">/* File read/write pointer */</span>
DWORD fsize; <span class="c">/* File size */</span>
CLUST org_clust; <span class="c">/* File start cluster */</span>
CLUST curr_clust; <span class="c">/* File current cluster */</span>
DWORD dsect; <span class="c">/* File current data sector */</span>
} FATFS;
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