e z L C D -‐ 4 0 5
|
106
Rev.
© 2016 Earth Computers Tech. Inc.
ezLCD Response
After receiving the SD_FILE_OPEN command, the ezLCD responds with the following sequence:
7
6
5
4
3
2
1
0
0
0
1
1
1
1
1
1
Byte 0:
3F
hex,
63
dec
Byte 1: File ID (Success), 0 (Error)
The ezLCD response is sent through the same interface, which received the SD_FILE_OPEN
command.
Touch Screen Processing
SD_FILE_OPEN command temporary disables the touch screen.
The touch screen will be automatically re-‐enabled when all files are closed. This can be done by
issuing the
SD_FILE_CLOSE
or
SD_FILE_CLOSE_ALL
command.
Note:
The touch screen is temporary disabled, even if due to error no file is opened. If this is
the case, issuing "dummy"
SD_FILE_CLOSE
or
SD_FILE_CLOSE_ALL
command will re-‐enable the
touch screen.
Example:
The following sequence will open file MyFile.dat
SD_FILE_OPEN
71
hex
1
1
dec (File ID)
'M'
4D
hex
'y'
79
hex
'F'
46
hex
'i'
69
hex
'l'
6C
hex
'e'
65
hex
'.'
2E
hex
'd'
64
hex
'a'
63
hex
't'
74
hex
NULL
0
hex
File ID / Error
Summary of Contents for ezLCD-405
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