FreeRTOS/Common/FileSystem/FatFs-0.7e/doc/en/sfatfs.html

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  14 <h2>FATFS</h2>
  15 <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>
  16 <pre>
  17 typedef struct _FATFS_ {
  18     BYTE    fs_type;    /* FAT sub type */
  19     BYTE    drive;      /* Physical drive number */
  20     BYTE    csize;      /* Number of sectors per cluster */
  21     BYTE    n_fats;     /* Number of FAT copies */
  22     BYTE    wflag;      /* win[] dirty flag (1:must be written back) */
  23     BYTE    fsi_flag;   /* fsinfo dirty flag (1:must be written back) */
  24     WORD    id;         /* File system mount ID */
  25     WORD    n_rootdir;  /* Number of root directory entries (0 on FAT32) */
  26 #if _FS_REENTRANT
  27     _SYNC_t sobj;       /* Identifier of sync object */
  28 #endif
  29 #if _MAX_SS != 512
  30     WORD    s_size;     /* Sector size */
  31 #endif
  32 #if !_FS_READONLY
  33     DWORD   last_clust; /* Last allocated cluster */
  34     DWORD   free_clust; /* Number of free clusters */
  35     DWORD   fsi_sector; /* fsinfo sector */
  36 #endif
  37 #if _FS_RPATH
  38     DWORD   cdir;       /* Current directory (0:root)*/
  39 #endif
  40     DWORD   sects_fat;  /* Sectors per fat */
  41     DWORD   max_clust;  /* Maximum cluster# + 1. Number of clusters is max_clust - 2 */
  42     DWORD   fatbase;    /* FAT start sector */
  43     DWORD   dirbase;    /* Root directory start sector (Cluster# on FAT32) */
  44     DWORD   database;   /* Data start sector */
  45     DWORD   winsect;    /* Current sector appearing in the win[] */
  46     BYTE    win[_MAX_SS];/* Disk access window for Directory/FAT */
  47 } FATFS;
  48 </pre>
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