add USB HID Touchscreen support for Teensy 3.2?

[epikao]

Hello,
with teensy 3.2 we can simulate a USB touchscreen, with
TouchscreenUSB.press(finger, x, y);
TouchscreenUSB.release(finger);

see also (touch descriptor etc.)
https://forum.pjrc.com/threads/32331-USB-HID-Touchscreen-support-needed

Unfortunately raspian can only shows touch if press touch but as soon as a release the touch freezes...
On Windows or Mac it works fine but not with Raspbian, can you add support?

see also:
#718 (comment)

[epikao]

No Help? I am a dummy regarding build linux kernel etc. So it would be really appreciate if somebody could add USB touchscreen support on Raspbian for the teensy USB touch simulator?

[JamesH65]

It's the weekend. Everyone is at home doing stuff that isn't work. I'm sure if someone is available, they can start to help out from Monday.

I think you might also need to be a bit more spercific about what you actually want., because from your post isn't clear to me. Is it a particular kernel option?

[epikao]

don't know if is a kernel option or not. The only one I know is that teensy USB Touchscreen (Simulator) is working perfectly on Windows or Mac but not on Linux? respectively not on my Raspberry with Raspbian Jessie Distro/OS (from 2017.04)...
I guess that Standard USB HID Touchscreen driver is already included on Raspbian?
However, a press Touch I can see properly, but as soon I remove my finger from touch the touch is freeze and it does not working any more.

[pelwell]

You're still running Jessie? Things have moved on since April last year, so your first step is to update to the latest Stretch and see if that makes a difference.

[epikao]

yes jessie, I also tried newest ubuntu mate but with exactly the same problem... so I do not believe that it will work with newest raspbian/jessie, anyway I will try it this evening.

[JamesH65]

You should use the latest Raspbian (Stretch) - that is the RPF supported distribution and has all the latest patches. I have no idea what kernel Ubuntu Mate is running, it's not ours.

[epikao]

the issue with rpi stretch (desktop) 2017.11.29 unfortunately is the same :-(, also did apt-get update.
First touch works (mouse symbol is moving) but after release respectively remove the finger the touch is freeze, no further reaction with touch.
What can I do?

[pelwell]

We don't have the resources to investigate Teensy and what it needs in order to work on Raspbian. I suggest you ask the Teensy community if one of them can explain exactly what is needed, or at least what the problem is.

One thing you could try yourself is running xev under Raspbian and Ubuntu Mate to see which X events are generated in response to touch screen activity. xev > touch_log.txt will capture the events to a file - try working through the same activities on both platforms in a systematic way, then comparing the log files. If nothing else it may show whether X events are stopping on Raspbian or whether they are still being generated and the GUI is locking up.

[epikao]

We don't have the resources to investigate Teensy and what it needs in order to work on Raspbian. I >suggest you ask the Teensy community if one of them can explain exactly what is needed, or at least what >the problem is.

they think the problem is X11 from Linux which is full of bug :-((

[epikao]

Hello, I have two USB touchscreens, the one with Atmel mXT1188s Controller and the other is as mention the Teensy 3.2 Controller.
Under xev with the Atmel Touchscreen I see ButtonPress event and ButtonRelease events.
With Teensy Touchscreen I only see ButtonPress but no ButtonRelease events... so why the Release Events are not recognise properly? As it looks that nobody has time - I am also willing to pay for that solution? The USB HID Touchscreen Descriptor Code etc. from Teensy is open source....

(PS: Atmel Touchscreen is working properly with Raspbian)

[pelwell]

Try the Advanced Users or Interfacing forums at https://raspberrypi.org/forums, or whatever the Teensy equivalent might be - your financial incentive is more likely to be productive there.

[epikao]

ok :-( but why the guy from follow topic with same problem you solved but my (same problem) not?
=> #718 (comment)

[JamesH65]

Because that was a simple kernel config change, whereas your issue appears to be a bug in the teesy toushscreen driver. And we don't know anything about those, or even have equipment to test with, and, TBH, we prefer to fix bugs in our own stuff before we start fixing bugs other peoples stuff.

[pelwell]

If you identify the changes which need to be made - as happened in the other thread - then there is a good chance that they would be accepted, but I suspect this issue is more complicated, and you need to accept that and enlist the help of a Teensy dev (or advanced user).

[epikao]

> whereas your issue appears to be a bug in the teesy toushscreen driver.

I think is more a Linux / X11 problem and not a teensy, as my teensy is working properly with Windows and Mac....

[epikao]

Please note: It's definetly a Linux problem, because I have now tested with windows 10 IOT on Raspberry and Touchscreen Teensy is working properly!
But it does not work on Raspbian, Jessie, not on OSMC and also not on Linux Ubuntu Mate!!

[jakemagee]

Have you tried testing with an x86 Linux system? You may very well be having an issue with Linux / X11, but this wouldn't be the correct place to seek help unless you can provide details that indicate it is specifically related to the Raspberry Pi.

[epikao]

and which Linux for x86 should I try? Ubuntu?

[jakemagee]

I think that would be an adequate place to start. And if it still doesn't work, you'll need to then find a more generic linux / X11 forum to post on. Once you get it working on an x86 machine, it will be much easier to determine the fix for a Raspberry Pi.

[epikao]

yes but which linux distro do you recommend for testing that on a x86 sytem? ubuntu, suse etc??

[pelwell]

See previous answer. @jakemagee said that Ubuntu would be a reasonable place to start.

[jakemagee]

Yes, that's what I was saying. Try it on a x86 system with Ubuntu 17.04.

[epikao]

ok. I will try tomorrow to install Ubuntu 17.04 on my old laptop.
at the moment I can only hope that in the near future X11 will be replaced with Wayland or Mir....

[epikao]

with Ubuntu 17.04 on my old laptop I have the same problem... so I think teensy Code is not compatible to Linux. Teensy developer are now checking the problem... Hope they will find a solution...

[jakemagee]

Sounds good. Can you close the issue for now? If you get it working on a x86 Linux machine and it still doesn't work on a Raspberry Pi, you could open back up an issue.