Are you using it in 4 or 8 bit mode?  4 bit is a little harder to init but
there are many sources for LCD code available.  Check for some sample code
and compare your init code with other's.


-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
Behalf Of Simon Stirley
Sent: Wednesday, October 31, 2001 4:24 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: LCD panel init problems

The datasheet I've got for LCD controllers recommends sending 0x30 three
times before using the display, it doesn't explain what's magic about 30 hex
though ;-)  worth a try I guess ..

HTH, Simon.

> -----Original Message-----
> From: Jeff DeMaagd [mailto:jeff@DEMAAGD.COM]
> Sent: 31 October 2001 21:29
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: LCD panel init problems
>
>
> I have a 2x20 character LCD panel that doesn't seem to want
> to init properly
> on some power-ups.  We do have it and some 4x4 capacitive
> keypad circuitry
> connected to the main board by a fairly scandard type 6" /
> 15cm long ribbon
> cable.  Sometimes it powers up and inits properly, sometimes
> it displays
> garbage.  Once it starts fine, it runs fine until shutdown.
> Once garbage,
> always garbage until shutdown.  A power cycling might change
> the situation,
> but that is not guaranteed.
>
> Should I try to add some a big bypass cap or check something
> else?  All the
> ICs and the panel seems
> to be properly bypassed to me.  I have also tried the
> power-up timer on the
> PIC too, with little change.
>
> Any general recommendations?  Thanks!
>
> Jeff
>
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