GLK240128-25-WB-VPT Matrix Orbital, GLK240128-25-WB-VPT Datasheet - Page 41

• Manufacturer Part Number: GLK240128-25-WB-VPT
• Description: LCD GRAPHIC DISPL 240X128 BLU WH
• Manufacturer: Matrix Orbital
• Series: GLK240128-25r

Specifications of GLK240128-25-WB-VPT

• Display Type: LCD - Color
• Display Mode: Transmissive
• Viewing Area: 114.00mm L x 64.00mm W
• Backlight: LED - Blue
• Dot Pixels: 240 x 128
• Interface: I²C, RS232, TTL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Dot Size: -
• Dot Pitch: -
• Other names: GLK240128-25 -WB-VPT; GLK240128-25 -WB-VPT

File Upload Protocol
Once a bitmap or font file has been created and paired to its command it must be sent using a file
protocol developed specifically for Matrix Orbital displays. Once a file upload command has been sent
requesting a unique reference number and specifying the file size required, the display will respond
indicating whether it has enough room to save the file or not. As is the case throughout the upload
protocol, a response of 1 will indicate confirmation while an 8 corresponds to rejection and will
terminate the session.
Once a file is confirmed to fit within the display, the upload will begin. A protocol is used here to ensure
each byte is uploaded successfully. After each byte is sent, the module will echo it back to the host. It
should then be checked against the value originally sent before a confirmation byte of 1 is returned. If
the transmitted and echoed values do not match the upload should be aborted by sending a value of 8
instead. The upload will continue in this manner as indicated by the examples below which utilize
familiar font and bitmap files.
It should be noted that the display has a timeout setting of 2.1 seconds before it resets to prevent it
from hanging during the upload process. Upon reset, the values 254 and 212 will be returned to
indicate an error or lengthy delay has occurred in the upload process. If everything goes smoothly, the
protocol will end with the host transmitting a final confirmation byte and the font will be stored in the
display ready for any application.
35
Host
254
36
31
96
...
1
0
0
0
0
5
1
1
Display
96
...
1
5
Table 38: Font Upload Protocol
Upload Font File Command
First Font Data Byte
Last Font Data Byte
Confirm Data Byte
Confirm Data Byte
Reference ID MSB
Size Confirmation
Font File Size LSB
Reference ID LSB
Command Prefix
Echo Data Byte
Echo Data Byte
Font File MSB
Font File Size
Font File Size
Comments
Value
1
8
...
Confirm
Decline
Action
Table 37: Upload Protocol Responses
Transfer successful, upload continues
Transfer failed, abort upload
Host
254
224
Description
94
...
1
0
5
0
0
0
5
1
1
Display
224
...
1
5
Table 39: Bitmap Upload Protocol
Upload Bitmap File Command
First Bitmap Data Byte
Last Bitmap Data Byte
Bitmap File Size LSB
Confirm Data Byte
Confirm Data Byte
Reference ID MSB
Size Confirmation
Reference ID LSB
Command Prefix
Bitmap File MSB
Bitmap File Size
Bitmap File Size
Echo Data Byte
Echo Data Byte
Comments
...