Read the statement by Michael Teeuw here.
IR Touch Frame calibration
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@peemoeller said in IR Touch Frame calibration:
@cyberphox Hi there, ok! I now managed to get my IR Touch Overlay set to portrait! also just finished running the xinput touch calibrator program under ‘Preferences’ (it had me touch the 4 red crosses). It shows:
< Calibrating standard Xorg driver “Multi touch overlay device” current calibration values: min_x=0, max_x=65535 and min_y=0, max_y=65535
If these values are estimating wrong, either supply it manually with the - -precalib option, or run the ‘get_precalib.sh’ script to automatically get it (through HAL). >My issue, I find the curser doesn’t reach the the edges of my monitor. Example I can’t simply click on the Raspberry Icon in the corner. The curser is diaginally 2 inches away? I have a 42 inch IR Touch Overlay using a 32 inch LCD monitor.
Where can I set or adjust this? Any thoughts?
Fun!
i ask the same question my bro
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@klimbo said in IR Touch Frame calibration:
mple I can’t simply click on the R
So, has anyone found a solution for this?
I have a 32 inches mirror (and 32 inches touch frame) in a 18 inches screen. Since the touchframe is bigger than the screen i couldn’t find a way to calibrate it to just work on the 18 inches screen area (as I do when I calibrate it on Windows).Does anyone have any thoughts on how to do this?
Thanks.
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Here is a few more information.
The picture below shows my mirror (with the 18’’ screen) and the 32’’ touch frame above it.
(This is just a test mirror, that’s why the touch frame doesn’t match the mirror frame. And just ignore the painted part… it’s just some information i can’t share)Before calibrating it, the 18’’ screen is “mapped” to the whole 32’’ touch frame. That’s expected.
![alt text]( image url)
What I need to do is calibrate it so the only part of the touch frame that will recognize the touch is the area of the 18’’ screen.
I run the command
DISPLAY=:0.0 xinput_calibrator
Then I calibrate the screen, like the picture below (clicking the four points)
The output of the command is:
Calibrating standard Xorg driver "Touch Device FC315WH00DL-CT-B2-20P" current calibration values: min_x=0, max_x=65535 and min_y=0, max_y=65535 If these values are estimated wrong, either supply it manually with the --precalib option, or run the 'get_precalib.sh' script to automatically get it (through HAL). --> Making the calibration permanent copy the snippet below into '/etc/X11/xorg.conf.d/99-calibration.conf' Section "InputClass" Identifier "calibration" MatchProduct "Touch Device FC315WH00DL-CT-B2-20P" Option "MinX" "8770" Option "MaxX" "46111" Option "MinY" "5539" Option "MaxY" "40880" EndSection
But nothing changes… when I touch the screen again, the same thing is happening: the 18’’ screen is “mapped” for the whole 32’’ touchframe, not just the area of the 18’’ screen.
I tried saving the code above both on /etc/X11/xorg.conf.d/99-calibration.conf and modifying the values of Min/Max X/Y (like changing from 46111 to 2000) but absolutely nothing changes… I think the touchframe is not using these values for anything.
When I use the same touchframe on windows and use the calibration tool, it map my 21’’ PC monitor correctly for the 32’’ touch frame.
I’ve been struggling with this for a few days and I see that a lot of people is having/had the same problem. Does anyone know a solution for this?
Thanks.
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Ok, after a lot of hours searching and testing i finally figured it out.
Forget about all that getting the values for minX, maxX, minY and maxY that all the sites talk about. Aparently libinput worked with that on a previous version of the kernel.
What you have to do is change the values of the parameter “libinput Calibration Matrix”
Steps:
- find your devices name (or id) with the command
"xinput"
If it fails with a message “Unable to connect to X server” just use before.
export DISPLAY=:0.0
Write down your devices name and id
- Reset your devices calibration matrix:
xinput set-prop "YOUR_DEVICES_NAME" "libinput Calibration Matrix" 1 0 0 0 1 0 0 0 1
(Obs: this “virgin” matrix above is for the screen WITHOUT ANY ROTATION. Just plain landscape mode, aka, “display_rotate=0” on /boot/config.txt
I’ll talk about rotation below)- Start xinput_calibrator on verbose mode:
xinput_calibrator -v
Click the points on the screen and you should se something like this on the output:
DEBUG: Adding click 0 (X=181, Y=132) DEBUG: Adding click 1 (X=862, Y=129) DEBUG: Adding click 2 (X=186, Y=661) DEBUG: Adding click 3 (X=868, Y=665)
We’ll need only the click0 and click3 X and Y
- Get your screen current resolution:
xrandr | grep current
You’ll see something like:
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
- Calculate the values for A, B, C and F:
a = (screen_width * 6 / 8 ) / (click_3_X - click_0_X)
c = ((screen_width / 8 ) - (a * click_0_X)) / screen_width
e = (screen_height * 6 / 8 ) / (click_3_Y - click_0_Y)
f = ((screen_height / 8 ) - (e * click_0_Y)) / screen_height
On my case I made excel formulas, but was something like:
a = (1920 * 6 / 8 ) / (868 - 181) = 2,09606
c = ((1920 / 8 ) - (2,09606 * 181)) / 1920 = -0,07260
e = (1080 * 6 / 8 ) * (665 - 132) = 1,51970
f = ((1080 / 8 ) - (1,51970 * 132)) / 1080 = -0.06074(I have no idea why they use those letters or where the hell these formulas came from… if you wanna know, more I got it from here: https://wiki.archlinux.org/index.php/Calibrating_Touchscreen )
- Then set the new Calibration Matrix using the values above with the command:
xinput set-prop "YOUR_DEVICES_NAME" "libinput Calibration Matrix" a 0 c 0 e f 0 0 1
There you go. Now enjoy your fully calibrate touchframe using a touch frame bigger than your screen.
- To make it permanent:
Create the file: /etc/X11/xorg.conf.d/99-calibration.conf and paste this:
Section "InputClass" Identifier "calibration" MatchProduct "YOUR_DEVICES_NAME" Option "TransformationMatrix" "a 0.0 c 0.0 e f 0.0 0.0 1.0" EndSection
(of course change your devices name and the values for a, c, e and f)
About rotating the screen
Well, I think I can’t help you guys much with this, since I don’t even know what I did to make it work. When you rotate the screen (display_rotate=X on /boot/config.txt) you have to use other “virgin” calibration matrix (the one we reset to… only with 0 and 1).
If you wanna know more: maybe this site will help https://wayland.freedesktop.org/libinput/doc/1.11.3/absolute_axes.htmlI am using display_rotate=1
So the “new matrix” is:
0.0 1.0 0.0 -1.0 0.0 1.0 0.0 0.0 1.0
(I had to put ‘.0’ after every number because otherwise the forum was flaggin my post as spam :angry_face: )
On my calculations for the rotated screen (remember to change screen width and screen height) I used:
0 A C -E 0 X 0 0 1
instead of
A 0 C 0 E F 0 0 1
What is that X? Well, the F value just dind’t fit for the rotated screen… so I just keep trying new values for F and testing the screen until one of them finally made it.Well, I hope it helps somebody.
See ya. -
Actually, the first link should be: https://wiki.archlinux.org/index.php/Talk:Calibrating_Touchscreen
I couldnt edit my post anymore because the forum is still thinking this is spam…
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Thank you for your instructions. Unfortunately, this does not work for me. I have a 42 “frame over a 32” monitor.
The monitor is only a part of the touch frame area.
According to your instructions, no error message appears, but the ratio does not fit in the calibration. Do you have a tip for me here?