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G120 Touch screen support


#1

Which pins on the G120 module is used for resistive touch interface?

Morten Hedegaard


#2

If there display does not have a touch controller, then the interface would be analog inputs.


#3

Hi txd,

Resistive Touch is not yet implemented in G120. It is slated for a future Firmware release.


#4

Hi aron,
I repeat the last question from txd. I’d use the G120 module with my own card,
Is that now I can use this som module with TE35 display touch interface ?
Which pins are are used on the G120 module to interface TE35 touch screen fonctionnality?
Best regards,


#5

See the FEZ Cobra II schematics on where the touch socket pins are connected please. http://ghielectronics.com/catalog/product/398


#6

Hi,

This post made me a bit ( …or more) confused.

I’m currently using the G120 for a new design.
I’ll be using a different LCD than the TE35.

Raystar RFC35C-CIW-D-000
It’s a 3.5" LCD with a four wire resistive touch

Does the the G120 use the analog inputs to sample the XY electrodes?
Or do I need a dedicated touch screen IC to implement touch (I don’t see one on the TE35 or Cobra schematics)?

Thanks,
S.B.D


#7

Looking at the schematic Gus pointed to, the touch is connected to X4 and uses the ADC inputs on the G120 to handle the touch.

If you are doing a custom board, you could also use a touch controller IC. I did this with a recent design as I was then able to put the touch controller on the LCD PCB and then have SPI via the ribbon cable to the main board.


#8

thank you all,
I can now integrate all the G120 hardware part in my new design card,
then I guess the GHI library contains all the software elements!?


#9

Yes all software is already implemented.


#10

Thanks Gus