CCS/BOOSTXL-K350QVG-S1: Error reading touch screen coordinates

Sheetal Patil

Part Number: BOOSTXL-K350QVG-S1
Other Parts Discussed in Thread: TM4C123GH6PM,

Tool/software: Code Composer Studio

I have interfaced tiva TM4C123GH6PM with BOOSTXL-K350QVG-S1. I am working on touch examples.

I have tried examples provided in the Tiva Launchpad Workshop for touchscreen.

Now I am trying get the coordinates of the screen. I am able to get it but they are wrong.

Like top left should start from 0,0 but the values come out to be different.

I tried the calibration thing but after calibration the parameters which I get I used them but still the touch coordinates are wrong.

I tried a lot with the calibration but no success.

And the calibration code is for TM4C129x I tried modifying for TM4C123GH6PM. Maybe so I am not able to get success.

0 Bob Crosby over 4 years ago

Are you able to run the TivaWare example including the use of the touch screen?

"C:\ti\TivaWare_C_Series-2.1.4.178\examples\boards\ek-tm4c123gxl-boostxl-kentec-s1\grlib_demo"

If not, did you remove 0 Ohm resistors R9 and R10?

0 Sheetal Patil over 4 years ago in reply to Bob Crosby

Yes I have tried that example and it is working. I have also removed the resistors.

0 Bob Crosby over 4 years ago in reply to Sheetal Patil

Did you resolve this to your satisfaction?

0 Sheetal Patil over 4 years ago in reply to Bob Crosby

Yes I tried to resolve it

Even after calibration I was unable to get proper coordinates

So I noted the end point coordinates like top left coordinates were 23,0 and bottom right coordinates were 309,219

And I used a formula using these coordinates

x_coordinate = (obtained_x_coordinate - 23) * 320/286

y_coordinate = (obtained_y_coordinate - 0) *240/219

Values in bold can be changed for getting exact values.

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