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Touchscreen display reference design for ZedBoard

Former Member

I am running the ZedBoard_ALI3_Display_Controller_Tutorial_2014_4_01_0. I have tried both, building the design using the provided scripts, and downloading the prebuilt bin image in the sd directory (dated 05/22/2015). This is the latest version I have found.

The demo works for the most part. I am able to run the controller/console application. Changing switching and pressing buttons reflect properly on the display; however, the turning the LEDs from the touchscreen is not smooth or reliable. It takes several touches, taps and presses to get an LED to light, and sometimes certain ones do not respond at all (normally the extremities). I've tried calibrating, but even that seems buggy (often not responding to the tap on the cursor), and has not solved the problem.

Has anyone witnessed this type of problem/unreliability? I am trying to determine whether the hardware is defective, whether I am using the device incorrectly, or whether there is a bug in the design. If it is the latter, is it a product of the soft HW cores, or the software, and could it be fixed?

Thanks.

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    We are having the same issue. We've seen it on two of the new AES-ALI3-ZED-G models. We are in contact with Avnet looking for a solution. No luck yet.

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    We are having the same issues with the touch screen. Both on our own unit as well as on our customer's unit.
    In essence, the 'touch' part of it is simply useless:
    Sometimes it works, but it often gets into a state where it reports one fixed X coordinate, regardless of where the screen is touched.
    I have also seen very erratic behavior where it reports 2 fingers, or sensitivity gets stuck at 127 and sometimes it gets in a loop where it continually sends touch information without the screen being touched.
    Resetting the device doesn't help: a power cycle is required to get it out of this loop.
    We're talking with Avnet about it, but nothing much is happening.
    As said, the touch screen is too erratic to be of any practical use.

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    As already said above, I am having same issue with incorrect touch coordinates, the demo led not working and I have seen the continual touch pickup when not being touched. I have already sent one back and now have a new one, however I am still seeing these same issues.

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    Hi Guys,

    Sorry about the problems that you are seeing with the display kit.

    I talked with Alan and Paul about what they are seeing.  We believe part of the issues is due to a scaling mismatch between the coordinate data reported by the touch controller and the display resolution.

    We are working on a fix with the touch controller manufacturer and I will provide an update here if we find something that improves the performance.

    Sorry again about any issues you are seeing!

    Regards,

    -Kevin

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    Kevin,

    I will respond to your email in a minute, but I can already state that I don't think it's a scaling issue.
    Scaling only affects the Y coordinate (600 versus 480) and the problems we're seeing is with the X coordinate.
    Further more, that scaling (600 to 480) is extremely easy to do in my firmware, in fact, I already did that and seemed to work fine. And so must every other user of this product in order to make it work okay. If you're now going to add scaling to the touch screen's firmware, you're going to break existing working software!

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    In a previous post I mentioned that we were talking to Avnet about this, but that nothing much was happening.
    To be fair: things ARE happening now: Avnet (Kevin) is working with their supplier and with their own design engineers to fix firmware and hardware issues, and while not entirely out of the woods yet, we're seeing some good progress on this.
    I'm deeply impressed by this level of support by Avnet in general and Kevin in particular. Thanks guys, for trying to get to the bottom of this.

    ~ Paul

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    I am experiencing the same problem with new AES-ALI3-ZED-G. Is there an update on the progress toward a resolution?