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? about touchscreen calibration



  • I'm looking for some insight into how to do touchscreen calibration.

    My embedded systems details don't really matter as I have Linux & Qt up and running correctly. But in case you are interested, it's a Xilinx Zynq FPGA with Qt 5.6.3 on it.

    I can't seem to figure out the "proper" way to do calibration of a touchscreen. It looks like in Qt 4.x day, there was the QWSMouseHandler::calibrate() function. That seems to have gone away in Qt 5.x..

    I can't seem to find the same functionality in Qt 5.6.3. But, the Qt embedded docs http://doc.qt.io/QtForDeviceCreation/qtee-customization.html seem to say that one should use the TSLIB plugin.

    I'm currently using EVDEVTOUCH and it works well. But, I'm in need to calibrate the touchscreen. Should I be using TSLIB instead?

    Thanks.

    -brad w.



  • Is your application only need single touch? tslib only support single touch.
    Our application in low-end device uses tslib to calibrate the touch screen.
    With the backend, linuxfb, tslib works very well.



  • @wthung
    I went with TSLIB since we only needed single touch. It works pretty well.

    Thanks for the suggestion!


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