Re: [Gumstix-users] touchscreen success

[Jayesh S. <jay...@gm...>]

Thanks Chris! Useful info.

On 5/10/07, Chris Dollar <chr...@gm...> 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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