fatfs_macros.h File Reference

Macros
#define	GET_FAT16_FAT_SECTOR(DPTR, SECTOR)
	The following macros compute geometry for FAT16 filesystems...
#define	GET_FAT16_ROOT_SECTOR(DPTR, SECTOR)
#define	GET_FAT16_CLUSTER_SECTOR(DPTR, CLUSTER, SECTOR)
#define	GET_CLUSTER(ENTRY, RESULT)
	The following macros minipulate data for a directory entry...
#define	GET_FILESIZE(ENTRY, RESULT)
#define	SET_FDATE(Y, M, D, DATEARRAY)
#define	SET_FTIME(H, M, S, TIMEARRAY)
#define	GET_FDATE(DATEARRAY, Y, M, D)
#define	GET_FTIME(TIMEARRAY, H, M, S)

---

Macro Definition Documentation

#define GET_FAT16_FAT_SECTOR	(		DPTR,
			SECTOR
	)

Value:

{                                                                \
    (SECTOR)  = (DPTR)->msDevInfo.mnSectorOffset;                \
    (SECTOR) += (DPTR)->ReservedSectorCount;                     \
}

The following macros compute geometry for FAT16 filesystems...

#define GET_FAT16_ROOT_SECTOR	(		DPTR,
			SECTOR
	)

Value:

{                                                                \
    GET_FAT16_FAT_SECTOR((DPTR), (SECTOR));                      \
    (SECTOR) += (DPTR)->FATSize * (DPTR)->NumFATs;               \
}

#define GET_FAT16_CLUSTER_SECTOR	(		DPTR,
			CLUSTER,
			SECTOR
	)

Value:

{                                                                \
    GET_FAT16_ROOT_SECTOR((DPTR), (SECTOR));                     \
    (SECTOR) += (((DPTR)->MaxRootEntries * sizeof(tsDirEntry)) + \
                 ((DPTR)->msDevInfo.mnBytesPerSector - 1)) /     \
                  (DPTR)->msDevInfo.mnBytesPerSector;            \
    if ((CLUSTER) > 2)                                           \
        (SECTOR) += ((CLUSTER) - 2) * (DPTR)->SectorsPerCluster; \
}

#define GET_CLUSTER	(		ENTRY,
			RESULT
	)

Value:

(RESULT)  = ((int)(ENTRY)->maClusterMSW[1]) << 24; \
    (RESULT) |= ((int)(ENTRY)->maClusterMSW[0]) << 16; \
    (RESULT) |= ((int)(ENTRY)->maClusterLSW[1]) <<  8; \
    (RESULT) |= ((int)(ENTRY)->maClusterLSW[0]);

The following macros minipulate data for a directory entry...

#define GET_FILESIZE	(		ENTRY,
			RESULT
	)

Value:

RESULT  = ((int)(ENTRY)->maFileSize[3]) << 24; \
    RESULT |= ((int)(ENTRY)->maFileSize[2]) << 16; \
    RESULT |= ((int)(ENTRY)->maFileSize[1]) <<  8; \
    RESULT |= ((int)(ENTRY)->maFileSize[0]);

#define SET_FDATE	(		Y,
			M,
			D,
			DATEARRAY
	)

Value:

(DATEARRAY)[0]  = ((D) & 0x1F);             \
    (DATEARRAY)[0] |= ((M) & 0x07) << 5;        \
    (DATEARRAY)[1]  = ((M) & 0x08) >> 3;        \
    (DATEARRAY)[1] |= (((Y)-1980) & 0x7F) << 1;

#define SET_FTIME	(		H,
			M,
			S,
			TIMEARRAY
	)

Value:

(TIMEARRAY)[0]  = ((S) & 0x3E) >> 1;        \
    (TIMEARRAY)[0] |= ((M) & 0x07) << 5;        \
    (TIMEARRAY)[1]  = ((M) & 0x38) >> 3;        \
    (TIMEARRAY)[1] |= ((H) & 0x1F) << 3;

#define GET_FDATE	(		DATEARRAY,
			Y,
			M,
			D
	)

Value:

(D)  = (DATEARRAY)[0] & 0x1F;               \
    (M)  = ((DATEARRAY)[0] >> 5) & 0x07;        \
    (M) |= ((DATEARRAY)[1] << 3) & 0x08;        \
    (Y)  = (((DATEARRAY)[1] >> 1) & 0x7F) + 1980;

#define GET_FTIME	(		TIMEARRAY,
			H,
			M,
			S
	)

Value:

(S)  = ((TIMEARRAY)[0] << 1) & 0x3E;        \
    (M)  = ((TIMEARRAY)[0] >> 5) & 0x07;        \
    (M) |= ((TIMEARRAY)[1] << 3) & 0x38;        \
    (H)  = ((TIMEARRAY)[1] >> 3) & 0x1F;