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Topic: Power up reset problem with LC7981 graphic display and u8glib (Read 456 times) previous topic - next topic

cornwallav8r

Apr 09, 2013, 03:35 pm Last Edit: Apr 09, 2013, 03:39 pm by cornwallav8r Reason: 1
Have been designing around u8glib library, (which works great by the way, Oli) and only just noticed that the display only properly initializes when it is code-dumped. That is, when I power off the arduino and lcd, on powering up, the screen goes garbled and stays that way, same for pressing arduino's reset button.  But when I make a program change, and upload it, the arduino and lcd resets properly and works perfectly.

Guessing it's a power on reset issue, possibly hardware, possibly something in the u8glib init timing.
Has anybody had any problem like this?

cornwallav8r

Still fighting this issue....can anyone at least tell me what the difference is, in the Arduino environment that is different with regards to program startup, as compared to powering off and on?
I mean it always works fine when i download the updated code, the display works fine.
But powering off the 5v supply which powers the lcd and Arduino, it doesn't reset properly.
Doesn't make any sense at all.  The solution lies somewhere there in the difference in how sketches are started during a program download....my best guess.  Thoughts?

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