[Icc-avr] 4-line LCD display

[Paul Mateer]

Hello....
 You might want to check out this website:

     http://home.iae.nl/users/pouweha/lcd/lcd0.shtml#_4_line_displays

Lots of good display info there.


On Jan 28, 2008 12:34 PM, Johannes Assenbaum <jassenbaum at htp-tel.de> wrote:

> For lines 3 & 4, HD44780-like controllers not have enough pins and use an
> extension driver ic. So your problem actually can be hardware, more
> concretely: on LCD pcb somewhere between controller and driver, including
> the chips.
>
>
> > Lines 3 & 4 go into gobbledigoog immediately after initialisation, and
> > never recover to normal operation. Lines 1 & 2 are always perfectly
> > alright (this also answers Bob's remark). No difference in contrast.
>
>
> > ________________________________
>
> > From: icc-avr-bounces at imagecraft.com
> > [mailto:icc-avr-bounces at imagecraft.com] On Behalf Of Sylvain Bissonnette
> > Sent: Monday, January 28, 2008 02:40 PM
> > To: Discussion list for ICCAVR and ICCtiny Users. You do NOT
> > needtosubscribetoicc-announce if you are a member of this.
> > Subject: Re: [Icc-avr] 4-line LCD display
>
>
> > Did you 2 line have the same contrast if not your initialization is not
> > good both line must look
> > identical
>
> > Sylvain
>
> >       ----- Original Message -----
> >       From: Albert vanVeen <mailto:Albert.vanVeen at pertronic.co.nz>
> >       To: Discussion list for ICCAVR and ICCtiny Users. You do NOT
> > needtosubscribeto icc-announce if you are a member of this.
> > <mailto:icc-avr at imagecraft.com>
> >       Sent: Sunday, January 27, 2008 8:13 PM
> >       Subject: [Icc-avr] 4-line LCD display
>
> >       Occasionally, but too often to ignore we have problems with 4x40
> > lcd displays: the borrom 2 lines display 'garbage'. No amount of
> > debugging and timing experiments have shown up anything so far, and the
> > conclusion "it must be a hardware problem" is tempting, but why then
> > would always the bottom half fail, as these 2 halfs are completely
> > identical?
>
> >       Any ideas?
>
> >       Albert.
>
>
>
>
>
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>
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-- 
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
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