EarthLCD ezLCD-405, Manual

Page: 126 / 173

e z L C D -­‐ 4 0 5 | 126
Rev.
© 2016 Earth Computers Tech. Inc.
1.7.46 SD_FORMAT
Description: Formats the SD in the specified file system.
Supported file systems : FAT12, FAT16, FAT32
Code: 4F hex, 79 dec
7 6 5 4 3 2 1 0
Byte 0: Command
Byte 1: First Character of the File System Specification
Byte 2: Second Character of the File System Specification
Byte 3: Third Character of the File System Specification
Byte 4: Fourth Character of the File System Specification
Byte 5: Fifth Character of the File System Specification
Warning: This command will erase all files on the SD
About the File System Specification:
·∙ Sets the file system in which the SD will be formatted.
·∙ 5 ASCII characters
·∙ ASCII characters only. For example: the code of '1' is 31hex.
·∙ Supported file systems: FAT12, FAT16, FAT32
About the supported file systems
FAT12 FAT16 FAT32
Full Name File Allocation Table
12-­‐bit version 16-­‐bit version 32-­‐bit version
Introduced 1977 July 1988 August 1996
Max file size 32 MB 2 GB 4 GB
Max number of files 4,077 65,517 268,435,437
Max Volume size 32 MB 2 GB 8 TB
ezLCD Response
After receiving the SD_FORMAT command, the ezLCD responds with either of the following
sequences:
SD_FORMAT
ASCII
ASCII
Fi
le
S
ys
te
m
Sp
ec
ifi
ca
tio
n
ASCII
ASCII
ASCII