2014-08-13 05:48:16 +00:00
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< title > FatFs - FATFS< / title >
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< 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 >
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< 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;
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