I have designed code for our 64 byte xfer USB HID device. It works great most of the time. On Occasion, I can see an 8 (time varies) second lag between reading the IN report data, and actually getting it. With a USB analyzer, the data gets back into windows in the proper amount of time, but occasionally (once/20 minutes) the data won't get back to my windows app for 8 or so seconds. Any clues?
Don't think it is a format error - thousands and thousands of packets are transferred, and occasionally, a time lag occurs. The data does eventually get back, and is always correct.
Hmm.. Is your PC application blocked by any heavy (background) process? typeperf commandline tool takes log of performance of your application at every second.
typeperf "\your_PC_application\% processor time" > a_log.txt
CTRL-C stops the log. Do you see any low-performance of your application, while the long delay occurs?
typeperf technet.microsoft.com/.../bb490960.aspx
Tsuneo