File Systems: FAT
void
App_InitFS (void)
{
FS_ERR err;
FS_FAT_SYS_CFG fat_cfg;
.
.
.
fat_cfg.ClusSize = 4;
fat_cfg.RsvdAreaSize = 1;
fat_cfg.RootDirEntryCnt = 512;
fat_cfg.FAT_Type = 12;
fat_cfg.NbrFATs = 2;
/*
/*
/*
/*
/*
Cluster size = 4 * 512-B = 2-kB.*/
Reserved area = 1 sector. */
Entries in root dir = 512. */
FAT type = FAT12. */
Number of FATs = 2. */
FSVol_Fmt(“ram:0:”, &fat_cfg, &err);
if (err != FS_ERR_NONE) {
APP_TRACE_DEBUG((“Format failded.\r\n”));
}
.
.
.
}
Listing 9-1 Example device format
9-2-2 DISK CHECK
Errors may accrue on a FAT volume, either by device removal during file system
modifications or by improper host operation. Several corruptions are common:
Cross-linked files. If a cluster becomes linked to two files, then it is called
“cross-linked”. The only way to resolve this is by deleting both files; if necessary, they
can be copied first so that the contents can be verified.
Orphaned directory entries. If LFNs are used, a single file name may span several
directory entries. If a file deletion is interrupted, some of these may be left behind or
“orphaned” to be deleted later.
Invalid cluster. The cluster specified in a directory entry or linked in a chain may be
invalid. The only recourse is to zero the cluster (if in a directory entry) or replace with
end-of-cluster (if in a chain).
116
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