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File Systems: FAT
As described in Appendix E, “Fat Configuration” on page 532, support for LFNs can be
disabled, if desired. If LFNs are enabled, the application may choose to specify file names in
UTF-8 format, which will be converted to 16-bit Unicode for storage in directory entries.
This option is available if FS_CFG_UTF8_EN is DEF_ENABLED (see Appendix E, “Feature
Inclusion Configuration” on page 527).
9-1-3 DIRECTORIES AND DIRECTORY ENTRIES
In the FAT file system, directories are just special files, composed of 32-byte structures
called directory entries. The topmost directory, the root directory, is located using
information in the boot sector. The normal (short file name) entries in this directory and all
other directories follow the format shown in Figure 9-2, with the following fields:
■
Name is the 11-character 8.3 SFN.
■
Attr are the attributes of the entry, indicating whether it is a file or directory, writable or
read-only and visible or hidden.
■
Creation Time and Creation Date are the time and date when the entry was created.
■
Access Date is the date on which the file was last accessed.
■
Write Time and Write Date are the time and date when the entry was last modified.
■
1st Cluster High and 1st Cluster Low contain the first cluster containing the file’s
data.
■
File Size is the file size, in octets. If the entry is a directory, this is blank.
4
8
12
16
Name
Attr
NT
res
Crt
ms
Creation
Time
1 Cluster
1 Cluster
Creation
Date
Access
Date
st
High
Write Time Write Date
st
Low
File Size
Figure 9-2 FAT Directory Entry (SFN Entry)
Within μC/FS, these are called Short File Name entries or SFN entries.
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