[beaglebone] lcd7 + qt-embedded touchscreen calibration

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1

Hi,

I’ve been playing with qt4-embedded a bit on the latest angstrom distro using the latest LCD7 cape, and when I run qtdemoE -qws the touchscreen pointer moves all over the place instead of following my finger. Mouse input works just fine.

I also ran ts_calibrate but that didn’t seem to make a difference.

In regular X, the pointer is pretty accurate.

Has anyone tried the qt4 demos in angstrom using touchscreen?

Thanks

2

HI,

I just started with Qt on a custom cape with same problem, didn’t try a mouse. Thanks for submitting I will check with the LCD7 to see if it is the same. I see patches in last months issue of the image that a change was made to try to make it more stable. Maybe still a software issue?

David

3

It is certainly a software issue, just not sure which part of the software. It feels like a scaling issue to me. As in, the middle 40% of the touchscreen are mapped to the entire screen.

From what I can tell qt-embedded for angstrom isn’t built with tslib (tslib touchscreen input is very stable). I’m trying to rebuild it, but while I’m at it I wanted to enable SGX acceleration because the qt demos put the CPU at 100%. Problem is, it doesn’t look like that works for the bone yet :(.

I might try ubuntu and qt-embedded to see how that works.

4

Hi I’m running my own qt program and I’m having the same problem, the touch is working but doesn’t follow my finger.
I run /usr/bin/tc_calibrate but same response.
It seems as if the cursors moves faster than the finger.
Anybody knows the solution of this problem?
Thanks in advance.

5

Talking about the running of touchscrenn using qt programs, in my case, the touchscreen get stuck and I have to change the terminal (Ctrl+F2, Ctrl+F1) to return to the normal running.

2012/8/6 Rai32 <ramon.benavent@gmail.com>

6

OK guys, found the fix. You need to setup the QWS driver to use tslib:

export QWS_MOUSE_PROTO=Tslib:/dev/input/event0

That fixes the problem.

7

I fixed the problem:
I download from http://www.angstrom-distribution.org/repo/?section=x11
-tslib-calibrate_1.0+gitr1+e17263ef401ee885a27d649b90b577cfb44500e0-r8_armv7a.ipk
-tslib-conf_1.0+gitr1+e17263ef401ee885a27d649b90b577cfb44500e0-r8_armv7a.ipk
-tslib-tests_1.0+gitr1+e17263ef401ee885a27d649b90b577cfb44500e0-r8_armv7a.ipk
I put this files in the beaglebone by sftp and install all of them:
#opkg install tslib-calibrate…
#opkg install tslib-conf**…**
#opkg install tslib-tests**…**
I executed ts_calibrated and export the lib:
#export QWS_MOUSE_PROTO=LinuxInput:/dev/input/event0

then run
#myapplication -qws
and runs good!!

8

I tried this, but it’s like the touchscreen stops working completly when I export QWS_MOUSE_PROTO. Any ideas? I tried both LinuxInput and Tslib.

9

Has anyone solved this problem?

Cheers,
Paulo

10

I’ve set three variables:

export QWS_MOUSE_PROTO=“Tslib:/dev/input/touchscreen0” ; Your touchscreen device
export TSLIB_CALIBFILE="/media/mmcblk0p1/pointercal" ; Your calibration file

export TSLIB_TSDEVICE="/dev/input/touchscreen0" ; Touchscreen device again

and it works ok. And it didn’t work without any of this variables.