[Arm-netbook] Interfacing touch screen to EOMA68-A20

[luke.leighton]

something from TI http://www.ti.com/product/tsc2017  ahh i remember
the TSC series well.... :)  they have debounce and so on.  my first
reverse-engineering experience dealing with those f****rs in the wince
HTC smartphones - drivers will be in the linux kernel now but back
then there weren't any, and it wasn't clear in the datasheet that the
ICs *only* respond if you write *two* bytes (one is a zero-pad)
followed by read two bytes... hmmm memory's fuzzy... that might have
been SPI...

anyway take a look joe, on TI's site: there's plenty to choose from.

l.


On Fri, Nov 1, 2013 at 1:55 PM, joem <joem at martindale-electric.co.uk> wrote:
> Hi,
>
> I got me 5 pieces of 4.3" touch screens.
> It should be same as the lcd described here that is already working:
>
>  http://gplsquared.com/eoma_boot/eoma_boot.html#working_lcd
>
> It has something extra - 4 wires for a touch interface - resistive.
>
> The signal pins are marked:
> 37 XR Touch panel XR
> 38 YD Touch panelYD
> 39 XL Touch panel XL
> 40 YU Touch panel YU
>
> They were purchased from Aliexpress - (cheaper when I bought it).
> http://www.aliexpress.com/item/4-3-inch-KD43G18-40NB-A1-KD43G18-A5-4-3-C430P-T43P12-GPS-lcd-screen-display/1297655486.html
>
>
> Any ideas which cheapie chips best to use with EOMA68-A20 to get touch
> screen operational?
>
>
> I assume it has to be I2C and somehow a bit of driver software will
> run and convert the I2C signals to mouse movements.
>
> Any pointers appreciated.
>
>
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