Frequently Asked Questions
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January 16, 2009
about 6 years ago
I can’t recommend this serial graphic LCD in its current incarnation. There must be something wrong with the serial backpack software, at least when used with this 128x64 display. It is extremely flaky. If you mix graphics and text, eventually it will lose track of the text coordinates and garble the screen. If you print text past the end of the screen, it doesn’t wrap back around like the documentation claims; it flickers the backlight madly. These things just shouldn’t happen…
Also, the documentation has several errors:
As previously mentioned, the commands for setting X and Y coordinates are 0x18 and 0x19, respectively, NOT 0x17 and 0x18 as listed in the documentation.
Setting reverse mode (e.g. light text on dark background) is 0x12, NOT 0x18 as listed in the documentation (this should be obvious from the above).
The command for drawing a box only reads 4 parameters (x1, y1, x2, y2), not 5 as claimed in the manual. The draw/erase parameter is omitted and hard-coded as 1 (draw). If you send a 5th parameter, it will be printed as text (a blank space or so somewhere).
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