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

[joem]

On Fri, 2013-11-01 at 13:55 +0000, joem 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.



oliv3r in #linux-sunxi give suggestion - the cubieboard has touch
interface on connector U14 - TP-X1, TP-X2, TP-Y1, TP-Y2, connect those
up, and then load driver sun4i_ts.ko and tune it, and it should just
work :)

I got cubieboards to try out with - so I try that weekend
and then document it all.