Isochronous transfer

Hi there,

First of all, happy new year, folks :)

I implemented an experimental isochronous transfer for libusb-win32
backend in PyUSB [1]. The problem is that when I call iso_write two
times in a row, the second call fail in usb_reap_asyn call, saying the
device is not properly functioning.

It uses the PyUSB test firmware [2], which is based on libusb
benchmark firmware.

I tested in Linux with libusb 1.0 backend and it works fine.

Any idea on what could be wrong in my code?

[1] http://bit.ly/1vJNGAg

[2] https://github.com/walac/bmfw

-- 
Best Regards,
Wander Lairson Costa

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