USB Enumeration Time

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hi,

As part of my project, i need to measure the USB enumeration time in OS and display to the user. I'm not sure whether that's already implemented in Windows 7. So, if it's not implemented, can i use Python to get the same, or which is the good language to get those values?

Please help.

Thanks,
Pramod

Posted 12-Feb-12 22:09pm

pramod037

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Jochen Arndt 13-Feb-12 8:00am

What exactly do you mean by USB enumeration time? The time from pluggin in an USB device until its presence is signalled by Windows?

pramod037 13-Feb-12 11:24am

Yes, that is the time i need to measure in Windows.

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RDBurmon · Answer 1 · 2012-02-12T22:24:00

Solution 1

Hope this helps

http://www.teamwavelength.com/permanent/usb/docs/api/src/cs-win-001.html[^]

Accept and vote this if helps
--Rahul D.

Posted 12-Feb-12 22:24pm

RDBurmon

Jochen Arndt · Answer 2 · 2012-02-13T06:58:00

As far as I know, Windows does not measure the time itself. There is no reason to do so.

If there is any solution to measure the time, C++ would be the best choice. Because you need to add some kind of low-level handler that is triggered by the plugin event. When an USB device is plugged in, a WM_DEVICECHANGE / DBT_DEVICEARRIVAL message is posted to all top level windows when the device is ready for use. This can be used to detect the end time. But detection of start time requires hooking deep into the kernels USB driver.

This link describes what happens upon plugin [^].

USB Enumeration Time

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USB Enumeration Time

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