Re: [AVR-Chat] Help debugging LCD display issues
2005-12-05 by MuRaT KaRaDeNiZ
Hi, in 4bit mode where should we connect the unused bits?
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-----Original Message-----
From: "James Washer" <washer@trlp.com>
Sent: 27.11.05 01:11:36
To: "AVR-Chat@yahoogroups.com" <AVR-Chat@yahoogroups.com>
Subject: Re: [AVR-Chat] Help debugging LCD display issues
Nice tip... thanks... as it turns out.. I think the problem was that I'd left D[0..3] floating on the LCD
On Sat, 26 Nov 2005 09:58:37 -0800 (PST)
amol_deshmukh <aad_iit@yahoo.com> wrote:
> hi
> i was stuck up with LCD for about half a month for a very small reason. i too had done everything correctly.
> i was trying to use LCD with AtMega16 in 4 bit mode using Port C. the JTAG bit on Port C wasnt diabled and for this tiny thing could not get LCD running. u might wanna check into that.
>
> --
> Amol Deshmukh
> 3rd Yr. Undergraduate
> Dept. of Mechanical Engg.
> IIT - Bombay, India
>
>
> Message: 1
> Date: Fri, 25 Nov 2005 13:50:35 -0800
> From: James Washer
> Subject: Help debugging LCD display issues
>
> I'm using an Optrex DMC16207 (HD44780) LCD display with a Mega32 and Peter Fleury's LCD library.
>
> Using the include test file, upon power-up, the top row of the display shows all 16 cells "lit" (darkened) with EVERY bit position darkened (i.e. a rectangle). The bottom row is blank.
>
> I've checked and checked that all is hooked up well, but nothing changes... any ideas?
>
> thanks
>
> - jim
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 2
> Date: Fri, 25 Nov 2005 20:52:52 -0600
> From: David Kelly
> Subject: Re: Help debugging LCD display issues
>
>
> On Nov 25, 2005, at 3:50 PM, James Washer wrote:
>
> > I'm using an Optrex DMC16207 (HD44780) LCD display with a Mega32
> > and Peter Fleury's LCD library.
> >
> > Using the include test file, upon power-up, the top row of the
> > display shows all 16 cells "lit" (darkened) with EVERY bit position
> > darkened (i.e. a rectangle). The bottom row is blank.
>
> Thats what an HD44780 looks like when its uninitialized.
>
> My guess is that you are not talking to it at all.
>
> --
> David Kelly N4HHE, dkelly@HiWAAY.net
> ========================================================================
> Whom computers would destroy, they must first drive mad.
>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 3
> Date: Fri, 25 Nov 2005 20:51:57 -0800
> From: James Washer
> Subject: Re: Help debugging LCD display issues
>
> Yes, I'm beginning to think that is the case. Thanks
>
> - jim
>
> On Fri, 25 Nov 2005 20:52:52 -0600
> David Kelly wrote:
>
> >
> > On Nov 25, 2005, at 3:50 PM, James Washer wrote:
> >
> > > I'm using an Optrex DMC16207 (HD44780) LCD display with a Mega32
> > > and Peter Fleury's LCD library.
> > >
> > > Using the include test file, upon power-up, the top row of the
> > > display shows all 16 cells "lit" (darkened) with EVERY bit position
> > > darkened (i.e. a rectangle). The bottom row is blank.
> >
> > Thats what an HD44780 looks like when its uninitialized.
> >
> > My guess is that you are not talking to it at all.
> >
> > --
> > David Kelly N4HHE, dkelly@HiWAAY.net
> > ========================================================================
> > Whom computers would destroy, they must first drive mad.
> >
>
>
>
>
>
> amol deshmukh
> mechanical engg.
> IIT-B, Powai ,Mumbai
>
> ---------------------------------
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