Hi Chris,

I was wondering where you got this screen, I have been searching for some time now (about 2 hours) via Google, Earth LCD, and have not find anything.  Am I just not looking in the right place, or they are really hard to find?

Also, how happy are you with that screen?  Is the refresh rate decent?

Thanks,

On 5/12/07, Chris Dollar < chris.dollar@gmail.com> wrote:
I'm using the ALPS LFH8P4032B which includes an integrated 4wire
resistive touch screen (datasheet here
http://hubbard.engr.scu.edu/embedded/lcd/lfh8p4032b/lfh8p4032b.html ).

Here are the connections:
ALPS --- Audiostix2
Y-Up  --- Y+
X-Lft   --- X+
Y-Dn  --- Y-
X-Rt   --- X-

You should check out the UCB1400 datasheet for more info on its
touchscreen controller, but afaik it only works with 4wire resistive
type touchscreens.

Chris

On 5/11/07, Jayesh Salvi <jayeshsalvi@gmail.com> wrote:
> That would be helpful too. Somewhere I read the advise to use 4-wire
> resistive touch screens with UCB1400. Does it not support other forms of
> touch screens (5-wire resistive or transmitive/capacitive for that matter)?
>
> Jayesh
>
>
> On 5/11/07, Jeff Sadowski < jeff.sadowski@gmail.com> wrote:
> > this is all the software side could you give the model of touchscreen
> > and wireing reference also? thanks :-)
> >
> > On 5/11/07, Jayesh Salvi <jayeshsalvi@gmail.com> wrote:
> > > Thanks Chris! Useful info.
> > >
> > >
> > > On 5/10/07, Chris Dollar < chris.dollar@gmail.com> wrote:
> > > > Just got the touchscreen working with my lcd on the regular
> > > > basix/connex buildroot.  I put together this wiki page detailing how
> > > > to do it at http://docwiki.gumstix.org/Touchscreen
> > > >
> > > > There is a patch that has to be applied to the kernel (and one that
> > > > has to be removed), but it only applies to the 2.6.20 kernel as it is
> > > > fixed in 21.  Other than that the build is pretty easy.  The part that
> > > > got me was the ucb1400 interrupt back to the pxa - no matter what I
> > > > would do the pxa wouldn't get the interrupt and the touchscreen driver
> > > > would hang.  As is turns out, the IRQOUT pin on the ucb1400 is
> > > > connected to PWM0, aka GPIO 16, on the gumstix, which I was using to
> > > > set my lcd contrast.  Moving the lcd contrast to PWM1 to allow PWM0 to
> > > > function as the ucb1400 input pin got it all working.  Moral of the
> > > > story is: if you are using PWM0 for something else, the touchscreen
> > > > driver won't work.
> > > >
> > > > Chris
> > > >
> > > >
> > >
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Fabio Miguez