Author Topic: Graphic LCD 128x64 LCD-00710 Doesn't Work  (Read 489 times)

robinsenny

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Graphic LCD 128x64 LCD-00710 Doesn't Work
« on: July 12, 2018, 08:35:53 AM »
Hi,

I then tried read-modify-write to set individual pixels. My program just set all the pixels one at a time from left to right, top to bottom. It mostly worked, but the reads of the first pixel strip in each bank weren't reliable.I then tried writing blocks of pixels, one pixel at a time, at random places, not at the beginning of a line for either controller. Any time I changed the line, the first read produced garbage, even if the new line was in the same pixel strip as the previous line (e.g., it was the same address in the controller). A curious thing is that if I did two consecutive reads for the first read on each controller after changing lines, without resetting the address between reads, the problem went away.As I tried to figure out what was wrong (playing with delays and such) it got worse and worse until now it won't set any pixels at all. Status reads from the controllers appear to be working (returning 0x20), but pixel writes and reads no longer work at all.I'm driving the display from an ATMEGA32 running on a combo Atmel Dragon / Dragon Rider, using code based on the driver from radek@dxp.pl (I can't spell his name without special characters). I see that "radek"'s code does two reads for each read-modify-write operation. Does anybody understand why this is needed?

Please help.

I didn't find the right solution from the Internet.

References:-
https://forum.sparkfun.com/viewtopic.php?t=37447
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Thanks!





 

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