topic Re: How to work with touch screen ? in i.MX Processors

How to work with touch screen ?

snan1z — Wed, 29 Jun 2011 09:21:19 GMT

Hi all,

I want to use my MCIMX28LCD Seiko 4.3" touch screen. but i can't. I tried to enable it from kernel configuration "Device Drivers/input device support / touch screens / MXS LRADC-based touchscreen" but it fails.

Please kindly help

Regards,

Sinan

Re: How to work with touch screen ?

snan1z — Wed, 29 Jun 2011 11:08:29 GMT

also i cant see it under /dev/input

Re: How to work with touch screen ?

BryanJI — Wed, 29 Jun 2011 12:00:20 GMT

PLZ copy your boot message then you can know what's wrong.

There are too many reasons could cause this.

Using dmesg to check

Re: How to work with touch screen ?

snan1z — Wed, 29 Jun 2011 17:53:43 GMT

Ok, i solved the problem, but i got a newer one. i can calibrate touch screen and test with "ts_calibrate","ts_test". but i cant use it with QT. In qt conf, i add -qt-mouse-tslib option but i couldn't use it.

Re: How to work with touch screen ?

VladanJovanovic — Thu, 30 Jun 2011 01:38:42 GMT

Did you run "export TSLIB_TSDEVICE=/dev/input/event2" before starting the Qt app?

Re: How to work with touch screen ?

RichardXiao — Thu, 30 Jun 2011 08:57:12 GMT

Test by OBDS.SB

Re: How to work with touch screen ?

snan1z — Thu, 30 Jun 2011 20:58:00 GMT

Vladan,

I tried it with "/dev/input/ts0" and "/dev/input/event0", but nothing happened.

Richard,

What is it? i searched from google but it outputs nothing.

Re: How to work with touch screen ?

VladanJovanovic — Fri, 01 Jul 2011 02:44:50 GMT

Sorry, my mistake.

export TSLIB_TSDEVICE=/dev/input/event1

export QWS_MOUSE_PROTO=tslib:/dev/input/event1

First one tells tslib what to use as touch input. Second one tells Qt what to use as input.

Re: How to work with touch screen ?

RichardXiao — Fri, 01 Jul 2011 03:14:32 GMT

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=IMX28_SW&fr=g

i.MX28 On-Board Diagnostic Suite OBDS

Sinan Emre Kutlu said:

Vladan,

I tried it with "/dev/input/ts0" and "/dev/input/event0", but nothing happened.

Richard,

What is it? i searched from google but it outputs nothing.

Re: How to work with touch screen ?

snan1z — Fri, 01 Jul 2011 06:47:38 GMT

Vladan,

I have "ts0, event0, mice" under /dev/input so i tried it with ts0 and event0 but i cant use touch screen with Qt.

Richard,

i didn't try OBDS.SB, but i think OBDS.SB tests only touch screen, not with Qt.

there may be problem with Qt/demos ? ( i used /demos/embedded/fluidlauncher to test like "./fluidlauncher -qws" )

Re: How to work with touch screen ?

YiLi — Wed, 03 Aug 2011 23:24:07 GMT

A related question, any one know how to configure the touch screen on ubuntu. I can see the pen up/down event from dmesg but could not press down any icon.

cat /dev/input/
event0 event2 event4 mice mouse1
event1 event3 event5 mouse0

Thanks,

Re: How to work with touch screen ?

snan1z — Thu, 04 Aug 2011 19:39:31 GMT

Yi,

Can you use ts_calibrate command ?

Re: How to work with touch screen ?

Nico — Mon, 07 Nov 2011 17:36:38 GMT

I'm using a touchscreen TSC2006 with LTIB (linux 2.6.35 ) on iMX28.

how to calibrate the touch screen?