[Lcdproc] I2C-LCD with 2 enable lines

[Markus Dolze]

Hello,

I found this display at www.pollin.de. They also have some documentation (in german only) and sample code available.

>From what I read it should be straightforward to connect this display to a standard PC's parallel port using Winamp wiring style, which supports vertically spanned displays.

The i2c-driver currently does not support vertically spanned displays with more than 1 controller. 

I guess you have to use i2c because the nslu2 does not have anything else, right?

Regards
Markus

-------- Original-Nachricht --------
Datum: Sun, 12 Nov 2006 10:31:23 +0100
Von: Carsten Tschense <carsten@michaeli-gymnasium.de>
An: Markus Dolze <bsdfan@nurfuerspam.de>
Betreff: Re: [Lcdproc] I2C-LCD with 2 enable lines

> Hi,
> it's a Wintek WD-C2704M-1HNN 27x4 with two seperate controllers for the
> first an the last two lines.
> The i2c-driver doesn't support two displays because the last pin of the
> i2c-port-extender is usually used to control the backlight.
> 
> I already tried modifing the driver, but it didn't go that well... I'm
> not a c programmer and don't know the driver modell... I'm using the
> adress of the pin former used by the backlight for the second enable
> line, the init-function looks well, too. Now: if displayID == 0 we're
> writing on both controllers??
> 
> Regarding the contrast-problem: yes, it controls the contrast.
> 
> 
> thanks,
> Carsten
> 
> Markus Dolze schrieb:
> > Hi,
> >
> > What type of display (manufacturer, modell) do you have? How many colums
> does this display have, 20 or more? 20x4 displays usually do not have a
> second enable line.
> >
> > AFAIK, the hd44780 driver (and it's i2c wiring driver) do only support
> vertically spanned displays. That is two or more displays which are arranged
> vertically to create a virtual display with more lines.
> >
> > Does anybody know if the i2c wiring supports several displays connected
> to i2c port?
> >
> > Or am I wrong and the i2c-driver is something different than hd44780
> with i2c wiring?
> >
> > Regards
> > Markus
> >
> > -------- Original-Nachricht --------
> > Datum: Sat, 11 Nov 2006 20:16:25 +0100
> > Von: Stefan Herdler <herdler@gmx.de>
> > An: Carsten Tschense <carsten@michaeli-gymnasium.de>,
> lcdproc@lists.omnipotent.net
> > Betreff: Re: [Lcdproc] I2C-LCD with 2 enable lines
> >
> >   
> >> Carsten Tschense wrote:
> >>     
> >>> Hi,
> >>> I've got a LCD without backlight and 4 rows and I'm using the
> i2c-driver
> >>> on a nslu2.
> >>> I connected EN2 to P7, which is usually used for the backlight, but I
> >>> was not able to change the driver-code to use all 4 rows :-/
> >>> Can anybody help me? =)
> >>>   
> >>>       
> >> The file for your wiring is /server/drivers/hd44780-i2c.c.
> >> The information you're searching must be in the function 
> >> lcdstat_HD44780_senddata() of /server/drivers/hd44780-4bit.c. It's the 
> >> enableLines stuff, I guess.
> >> It`s only a little hint (it's all I can do without such a display) but
> i 
> >> hope it helps.
> >>     
> >>> By the way, the display gets totally messed up (strange characters) as
> >>> soon as I lower the contrast with the potentiometer - the display only
> >>> works when the contrast is at maximum - any ideas?
> >>>   
> >>>       
> >> There's something wrong with the wiring, I guess.
> >> Does the contrast-potentiometer only mess up the display or does it 
> >> control the contrast too?
> >>     
> >>> thanks,
> >>> Carsten
> >>>
> >>> _______________________________________________
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> >>> http://lists.omnipotent.net/mailman/listinfo/lcdproc
> >>>
> >>>
> >>>   
> >>>       
> >> Stefan
> >> _______________________________________________
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> >>