Sending hid reports with WriteFile()

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I have a usb hid device under development.
When I send a report with WriteFile() (Win32) only every other report is received. WriteFile returns report len + 1 in the lpNumberOfBytesWritten parameter, which is correct (+1 for the report id, which I set to zero).
I am 99% sure its not a device issue.

Any ideas why only every other report gets through?

[edit]
The device has an interupt out end point, so this end point in being used, not ep0.

Posted 16-Aug-12 3:43am

__John_

Updated 16-Aug-12 3:56am

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Kenneth Haugland · Answer 1 · 2012-08-16T05:35:00

Solution 1

Can really tell unless you show us some code. Perhaps youll find something useful in these articles:

http://www.developerfusion.com/article/84338/making-usb-c-friendly/[^]
http://www.usbhidnetclass.org/[^]

Good luck :)

Posted 16-Aug-12 5:35am

Kenneth Haugland

__John_ · Answer 2 · 2012-08-16T22:57:00

Solution 2

Thanks Kenneth, I am having second thoughts about it not being the device.
Snoopy shows the packets going out.

Posted 16-Aug-12 22:57pm

__John_