FATFS

FATFS構造体は、FatFsモジュールのダイナミックワークエリアを保持し、アプリケーション側で確保・管理されます。アプリケーションから変更可能なメンバはありません。

FatFs

typedef struct _FATFS {
    BYTE    fs_type;        /* FAT type */
    BYTE    files;          /* Number of files currently opend */
    BYTE    sects_clust;    /* Sectors per cluster */
    BYTE    n_fats;         /* Number of FAT copies */
    WORD    n_rootdir;      /* Number of root directory entry */
    BYTE    winflag;        /* win[] dirty flag (1:must be written back) */
    BYTE    pad1;
    DWORD   winsect;        /* Current sector appearing in the win[] */
    DWORD   sects_fat;      /* Sectors per fat */
    DWORD   max_clust;      /* Maximum cluster# + 1 */
    DWORD   fatbase;        /* FAT start sector */
    DWORD   dirbase;        /* Root directory start sector (cluster# for FAT32) */
    DWORD   database;       /* Data start sector */
    DWORD   last_clust;     /* Last allocated cluster */
    BYTE    win[512];       /* Disk access window for Directory/FAT */
} FATFS;

Tiny-FatFs

typedef struct _FATFS {
    BYTE    fs_type;        /* FAT type */
    BYTE    files;          /* Number of files currently opend */
    BYTE    sects_clust;    /* Sectors per cluster */
    BYTE    n_fats;         /* Number of FAT copies */
    WORD    n_rootdir;      /* Number of root directory entry */
    BYTE    winflag;        /* win[] dirty flag (1:must be written back) */
    BYTE    pad1;
    DWORD   winsect;        /* Current sector appearing in the win[] */
    WORD    sects_fat;      /* Sectors per fat */
    WORD    max_clust;      /* Maximum cluster# + 1 */
    DWORD   fatbase;        /* FAT start sector */
    DWORD   dirbase;        /* Root directory start sector */
    DWORD   database;       /* Data start sector */
    WORD    last_clust;     /* Last allocated cluster */
    BYTE    win[512];       /* Disk access window for Directory/FAT/File */
} FATFS;