📄 ff.lst
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620 DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */
621 )
622 {
623 1 if (disk_read(fs->drive, fs->win, sect, 1) != RES_OK) /* Load boot record */
624 1 return 2;
625 1 if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55) /* Check record signature (always placed at offset 510 even
-if the sector size is >512) */
626 1 return 2;
627 1
628 1 if (!memcmp(&fs->win[BS_FilSysType], "FAT", 3)) /* Check FAT signature */
629 1 return 0;
630 1 if (!memcmp(&fs->win[BS_FilSysType32], "FAT32", 5) && !(fs->win[BPB_ExtFlags] & 0x80))
631 1 return 0;
632 1
633 1 return 1;
634 1 }
635
636
637
638
639 /*-----------------------------------------------------------------------*/
640 /* Make sure that the file system is valid */
641 /*-----------------------------------------------------------------------*/
642
643 static
644 FRESULT auto_mount ( /* FR_OK(0): successful, !=0: any error occured */
645 const char **path, /* Pointer to pointer to the path name (drive number) */
646 FATFS **rfs, /* Pointer to pointer to the found file system object */
647 BYTE chk_wp /* !=0: Check media write protection for write access */
648 )
649 {
650 1 BYTE drv, fmt, *tbl;
651 1 DSTATUS stat;
652 1 DWORD bootsect, fatsize, totalsect, maxclust;
653 1 const char *p = *path;
654 1 FATFS *fs;
655 1
656 1
657 1 /* Get drive number from the path name */
658 1 while (*p == ' ') p++; /* Strip leading spaces */
659 1 drv = p[0] - '0'; /* Is there a drive number? */
660 1 if (drv <= 9 && p[1] == ':')
661 1 p += 2; /* Found a drive number, get and strip it */
662 1 else
663 1 drv = 0; /* No drive number is given, use drive number 0 as default */
664 1 if (*p == '/') p++; /* Strip heading slash */
665 1 *path = p; /* Return pointer to the path name */
666 1
667 1 /* Check if the drive number is valid or not */
668 1 if (drv >= _DRIVES) return FR_INVALID_DRIVE; /* Is the drive number valid? */
669 1 *rfs = fs = FatFs[drv]; /* Returen pointer to the corresponding file system object */
670 1 if (!fs) return FR_NOT_ENABLED; /* Is the file system object registered? */
671 1
C51 COMPILER V8.08 FF 10/31/2008 14:44:16 PAGE 12
672 1 if (fs->fs_type) { /* If the logical drive has been mounted */
673 2 stat = disk_status(fs->drive);
674 2 if (!(stat & STA_NOINIT)) { /* and physical drive is kept initialized (has not been changed), */
675 3 #if !_FS_READONLY
if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
return FR_WRITE_PROTECTED;
#endif
679 3 return FR_OK; /* The file system object is valid */
680 3 }
681 2 }
682 1
683 1 /* The logical drive must be re-mounted. Following code attempts to mount the logical drive */
684 1
685 1 memset(fs, 0, sizeof(FATFS)); /* Clean-up the file system object */
686 1 fs->drive = LD2PD(drv); /* Bind the logical drive and a physical drive */
687 1 stat = disk_initialize(fs->drive); /* Initialize low level disk I/O layer */
688 1 if (stat & STA_NOINIT) /* Check if the drive is ready */
689 1 return FR_NOT_READY;
690 1 #if S_MAX_SIZ > 512 /* Get disk sector size if needed */
if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > S_MAX_SIZ)
return FR_NO_FILESYSTEM;
#endif
694 1 #if !_FS_READONLY
if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
return FR_WRITE_PROTECTED;
#endif
698 1 /* Search FAT partition on the drive */
699 1 fmt = check_fs(fs, bootsect = 0); /* Check sector 0 as an SFD format */
700 1 if (fmt == 1) { /* Not an FAT boot record, it may be patitioned */
701 2 /* Check a partition listed in top of the partition table */
702 2 tbl = &fs->win[MBR_Table + LD2PT(drv) * 16]; /* Partition table */
703 2 if (tbl[4]) { /* Is the partition existing? */
704 3 bootsect = LD_DWORD(&tbl[8]); /* Partition offset in LBA */
705 3 fmt = check_fs(fs, bootsect); /* Check the partition */
706 3 }
707 2 }
708 1 if (fmt || LD_WORD(&fs->win[BPB_BytsPerSec]) != SS(fs)) /* No valid FAT patition is found */
709 1 return FR_NO_FILESYSTEM;
710 1
711 1 /* Initialize the file system object */
712 1 fatsize = LD_WORD(&fs->win[BPB_FATSz16]); /* Number of sectors per FAT */
713 1 if (!fatsize) fatsize = LD_DWORD(&fs->win[BPB_FATSz32]);
714 1 fs->sects_fat = fatsize;
715 1 fs->n_fats = fs->win[BPB_NumFATs]; /* Number of FAT copies */
716 1 fatsize *= fs->n_fats; /* (Number of sectors in FAT area) */
717 1 fs->fatbase = bootsect + LD_WORD(&fs->win[BPB_RsvdSecCnt]); /* FAT start sector (lba) */
718 1 fs->csize = fs->win[BPB_SecPerClus]; /* Number of sectors per cluster */
719 1 fs->n_rootdir = LD_WORD(&fs->win[BPB_RootEntCnt]); /* Nmuber of root directory entries */
720 1 totalsect = LD_WORD(&fs->win[BPB_TotSec16]); /* Number of sectors on the file system */
721 1 if (!totalsect) totalsect = LD_DWORD(&fs->win[BPB_TotSec32]);
722 1 fs->max_clust = maxclust = (totalsect /* max_clust = Last cluster# + 1 */
723 1 - LD_WORD(&fs->win[BPB_RsvdSecCnt]) - fatsize - fs->n_rootdir / (SS(fs)/32)
724 1 ) / fs->csize + 2;
725 1
726 1 fmt = FS_FAT12; /* Determine the FAT sub type */
727 1 if (maxclust >= 0xFF7) fmt = FS_FAT16;
728 1 if (maxclust >= 0xFFF7) fmt = FS_FAT32;
729 1
730 1 if (fmt == FS_FAT32)
731 1 fs->dirbase = LD_DWORD(&fs->win[BPB_RootClus]); /* Root directory start cluster */
732 1 else
733 1 fs->dirbase = fs->fatbase + fatsize; /* Root directory start sector (lba) */
C51 COMPILER V8.08 FF 10/31/2008 14:44:16 PAGE 13
734 1 fs->database = fs->fatbase + fatsize + fs->n_rootdir / (SS(fs)/32); /* Data start sector (lba) */
735 1
736 1 #if !_FS_READONLY
/* Initialize allocation information */
fs->free_clust = 0xFFFFFFFF;
#if _USE_FSINFO
/* Get fsinfo if needed */
if (fmt == FS_FAT32) {
fs->fsi_sector = bootsect + LD_WORD(&fs->win[BPB_FSInfo]);
if (disk_read(fs->drive, fs->win, fs->fsi_sector, 1) == RES_OK &&
LD_WORD(&fs->win[BS_55AA]) == 0xAA55 &&
LD_DWORD(&fs->win[FSI_LeadSig]) == 0x41615252 &&
LD_DWORD(&fs->win[FSI_StrucSig]) == 0x61417272) {
fs->last_clust = LD_DWORD(&fs->win[FSI_Nxt_Free]);
fs->free_clust = LD_DWORD(&fs->win[FSI_Free_Count]);
}
}
#endif
#endif
753 1
754 1 fs->fs_type = fmt; /* FAT syb-type */
755 1 fs->id = ++fsid; /* File system mount ID */
756 1 return FR_OK;
757 1 }
*** WARNING C280 IN LINE 647 OF ..\SRC\FF.C: 'chk_wp': unreferenced local variable
758
759
760
761
762 /*-----------------------------------------------------------------------*/
763 /* Check if the file/dir object is valid or not */
764 /*-----------------------------------------------------------------------*/
765
766 static
767 FRESULT validate ( /* FR_OK(0): The object is valid, !=0: Invalid */
768 const FATFS *fs, /* Pointer to the file system object */
769 WORD id /* Member id of the target object to be checked */
770 )
771 {
772 1 if (!fs || !fs->fs_type || fs->id != id)
773 1 return FR_INVALID_OBJECT;
774 1 if (disk_status(fs->drive) & STA_NOINIT)
775 1 return FR_NOT_READY;
776 1
777 1 return FR_OK;
778 1 }
779
780
781
782
783 /*--------------------------------------------------------------------------
784
785 Public Functions
786
787 --------------------------------------------------------------------------*/
788
789
790
791 /*-----------------------------------------------------------------------*/
792 /* Mount/Unmount a Locical Drive */
793 /*-----------------------------------------------------------------------*/
794
C51 COMPILER V8.08 FF 10/31/2008 14:44:16 PAGE 14
795 FRESULT f_mount (
796 BYTE drv, /* Logical drive number to be mounted/unmounted */
797 FATFS *fs /* Pointer to new file system object (NULL for unmount)*/
798 )
799 {
800 1 if (drv >= _DRIVES) return FR_INVALID_DRIVE;
801 1
802 1 if (FatFs[drv]) FatFs[drv]->fs_type = 0; /* Clear old object */
803 1
804 1 FatFs[drv] = fs; /* Register and clear new object */
805 1 if (fs) fs->fs_type = 0;
806 1
807 1 return FR_OK;
808 1 }
809
810
811
812
813 /*-----------------------------------------------------------------------*/
814 /* Open or Create a File */
815 /*-----------------------------------------------------------------------*/
816
817 FRESULT f_open (
818 FIL *fp, /* Pointer to the blank file object */
819 const char *path, /* Pointer to the file name */
820 BYTE mode /* Access mode and file open mode flags */
821 )
822 {
823 1 FRESULT res;
824 1 DIR dj;
825 1 BYTE *dir;
826 1 char fn[8+3+1];
827 1
828 1
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