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Touchscreen Issue

Former Member

Hi,

I am setting up an application using the Xylon reference design for the MicroZed + Avnet 7" touchscreen.  The graphics work fine but the touchscreen is not working.

I managed to find this text in the boot sequence so it may help shed light on the issue:

tmg120_ts 0-0020: tmg120_ts: failed to read firmware version
tmg120_ts: probe of 0-0020 failed with error -5

Is anyone know what is/could be wrong and what I should do about it?

Thanks,

Tim

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  • 0 in reply to Former Member

    Hello,
    I am currently working with the MicroZed board interfaced with an I/O career card and an ALI3 based touchscreen. I am also facing the same problem as yours about the capacitive controller. I performed the same operations and got the same results, without getting the controller to work properly. I also found a sourcecode on the ELMG website (http://www.elmgdigitalpower.com/touchscreen-driver-tmg120/). I compiled it successfully for my kernel but, still, I can't get the controller to work. I can't figure out what am I missing, if there is some parameters to be set properly in my devicetree file or something else. May I ask you if you solved this issue and, if yes, may I ask how did you make it?

    Thanks in advance.
    Best regards,

    Emmanuel

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  • 0 in reply to Former Member

    Hi Emmanuel,

    Is there any sign that your display is communicating with the driver?

    There does need to be a device tree entry to describe the slave device you are targeting.  Xylon did the integration work to get this driver working on their reference design so I would recommend downloading that package and using their device tree as a reference for what entries are needed for your own device tree.

    http://www.logicbricks.com/logicBRICKS/Reference-logicBRICKS-Design/Xylon-Advanced-Display-Controller-MicroZed.aspx

    Regards,

    -Kevin

  • 0 in reply to zedhed

    Hello Kevin,

    There has been some improvement. I was actually confronted to another problem. I have been using the 3.6.0 version of the kernel for Xilinx and applied the patch, as indicated in the tutorial I found on this site about the installation of Ubuntu on the MicroZed (with the I/O career and the ALI3 touchscreen). When I used the devicetree.dts file provided by the kernel, I had indeed nothing in the /dev/input directory but "mice". When I took instead the devicetree.dts file I found in the Ubuntu image sources, I got the peripheral created correctly. After examining both the files, I saw that the IRQ values for the tmg120 node set by default in the kernel were wrong. But after setting the right values, still no reaction from the controller when I press the screen.
    I then replaced, in the sources of the 3.6 kernel, the tmg120_ts.c file provided by Tim King and recompiled. Now I am able to see the cursor move on the screen when I press it, however I can't get it calibrated properly. I do not know if this is because the screen is extremely sensitive (I am also working in an "electrically noisy" environment if I may say so) or because the driver needs to be improved (however thank you Tim for your work which allowed me to make a major step further!)
    I am now giving a look at the reference design provided by Xylon as you suggest.
    Thanks a lot for your help.

    Best regards,


    Emmanuel