High speed HID mark

I have a project that needs to interface a usb HID device.

It is a mouse like device design to follow precisely the speed of material that moves (to up to a few feet per second) under the optical sensor.

I read OK values using the code (http://www.codeproject.com/Articles/18099/A-USB-HID-Component-for-C).  Basically, it finds the device, opens a handle to it and this bed repeatedly with overlapped i/o.

My problem is in the conversion of the latter in a rate.  The component above raises an event in a WinForms program that uses Invoke to call a function that works at the speed and display it.

What I see is a set of maybe 10 results coming close (gap of a few milliseconds), then a big gap (30-40 ms).  Delta of the sensor values vary somewhat, but there is no obvious relationship between the gap (delta value) and the time between the values.

I don't know if it is an artifact of the Invoke that synchronizes the whole routine on the user interface thread, or if I should not expect a response from 'real time' of this type of reading.

There may be more low medium to achieve level (for example, DirectInput), but I don't know if it would have the same questions.

Any help or pointers would be welcome.

Iain

A question like this is better asked on Technet or Microsoft developers network.

Good luck

Tags: Windows

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