Hi,

Some things to try:

Maybe try an reset RC network on MCLR -- perhaps the power supply ramp rate
is not fast enough to properly reset the PIC.

Can you try another LCD?

Another PIC?

I know you said you are using the EXACT routines in the CHEAPIC examples for
4 MHz operation, but are you using a 4 MHz crystal, resonator, or clock
oscillator? I know it sounds obvious, just trying to help here.

Good luck.

Regards,

Ken Pergola







-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of rrc124+@PITT.EDU
Sent: Sunday, August 10, 2003 6:12 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC:] LCD, CHEAPIC routine, Top line bars 2/3 of time


Okay guys, there's one last thing that stands between me and my finished
project. The LCD readout. 1/3 of the time it works PERFECTLY.. i print out
my welcoming screen, print messages, clear the display, place cursors, etc.
But 2/3 of the time when i start up my PIC (and the LCD, tied to the same
power source), I get my top line as all black blocks (it's a 20x2) and the
bottom line black. Not welcome message, nothing. It is rather confusing.. I
thought that perhaps it was a timing issue, maybe me not letting
instructions settle enough during the init stage, but i doubled the time
delays and got nothing. I'm using the EXACT routines in the CHEAPIC examples
for 4Mhz operation (
http://www.piclist.com/techref/piclist/cheapic/wktim4m.asm ). Has anyone
experienced anything like this before? I mean, because everything else works
perfect 1/3 of the time, I can't stop thinking it has to be something right
on the edge..like the timing. I dunno. Thanks everyone :-)

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