Touch screen Calibration values and evtest in Yocto

anjalikkrishna — Sat, 24 Nov 2018 07:33:12 GMT

Hi all,

I have few doubts regarding the values obtained after calibrating an Yocto based system and running the evtest program running on the same system.

I calibrated the touch screen using the xinput_calibrator and obtained the following values:

Option "Calibration" "219 3879 172 4087"

Here Minimum x is 219, Maximum x is 3879 ,Minimum y is 172 and Maximum y is 4087

After that I executed the evtest and obtained the following values

Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 330 (BTN_TOUCH)
Event type 3 (EV_ABS)
Event code 0 (ABS_X)
Value 2059
Min 0
Max 4095
Event code 1 (ABS_Y)
Value 2137
Min 0
Max 4095
Event code 24 (ABS_PRESSURE)
Value 0
Min 0
Max 255
Properties:

Both the tests give the values for Minimum and maximum X and Y values. But both results are entirely different.

Any one who can help on this?

Re: Touch screen Calibration values and evtest in Yocto

igorpadykov — Mon, 26 Nov 2018 08:14:49 GMT

Hi Anjalik

tweaking touchscreen minimum and maximum values are described on example

Sabrelite: New FT5x06 touch screen and swapped Y (input_set_abs_params)

touch screen - Boundary Devices

Best regards
igor
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i.MX ProcessorsのトピックTouch screen Calibration values and evtest in Yocto

Touch screen Calibration values and evtest in Yocto

Re: Touch screen Calibration values and evtest in Yocto