Best way to synchronize UI with USB HID device?

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VS2010

I have designed an USB HID device which can answer our queries. So I can request this device for updates and the USB device sends back the updated data.
I am writing an application in C# using VS2010 and I have used USB HID library from Atmel "atusbhid.dll". I have some controls on the main form including text boxes and combo boxes.
Now the problem is that the application starts normal but gets slower and unresponsive with time passage. I have tried to solve the problem using Threads too, but not fruitful.

What is the best way to synchronize with USB HID device and to keep the GUI responsive?

Posted 18-Dec-13 1:25am

qureshi.yk

Updated 18-Dec-13 2:04am

v2

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Pheonyx 18-Dec-13 8:44am

What debugging have you tried? Have you managed to identify what parts of the code get slower? Have you looked at the applications memory usage (i.e. is there a memory leak)?

qureshi.yk 18-Dec-13 14:01pm

When I created a separate thread to retrieve data from USB device, I observed that after a while the device was still getting requests from the PC but my GUI was unresponsive. And what I think is that the GUI is not fast enough to get updated.

I would be very pleased if you can provide me any example or link to data polling with USB devices in C#.

Pheonyx 18-Dec-13 14:56pm

What happens if you take out the automatic updating and have a button in your UI that asks for a fresh from the device?

qureshi.yk 19-Dec-13 9:10am

With a single button click and also with longer delays it works absolutely ok and this is the reason why I think that the GUI is not fast enough to update the controls with automatic refresh. My desired refresh rate is 2 times a second.

qureshi.yk 30-Jan-14 18:05pm

I found the solution in Ahid.dll. This is paid USB HID library which really works fantastic for me. more information can be found at: http://ahidlib.com/index.php/ahid-and-vb

Sergey Alexandrovich Kryukov 18-Dec-13 8:50am

Not enough information.
—SA

Moralitos 18-Dec-13 11:13am

If you have a permanent loop polling the device you could put a Thread.Sleep(1) inside the loop

qureshi.yk 18-Dec-13 14:11pm

I have already put Thread.Sleep(500) inside my loop. The application gets normal if I unplug and replug the device. But soon after, the GUI starts to get unresponsive.

Moralitos 19-Dec-13 11:42am

Try to move polling device in a new task using
Task.Factory.StartNew(StartPolling);//StartPolling will be the method that poll USB HID device
And then you can change 500ms to a minor value

Szymon Roslowski 29-Jan-14 10:51am

Perhaps this is not the best time to change the hid library now but this one reads the device asynchronously :

http://www.codeproject.com/Tips/530836/Csharp-USB-HID-Interface

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