Hello Xiaofan, thanks for the reply. I did create the .inf file & selected it as the driver to load when the device is attached. My device shows up with no errors under Device Manager but when I run testlibusb-win.exe nothing at all is shown (not even for devices that windows can see). I have also installed the filter package as suggested by Wander but without success. I also did a completely fresh install of XP & loaded Python, PyUsb & libusb again. Same result. Then I loaded the filter package. This time testlibusb shows devices on only 1 bus but not my device. Note that on Ubuntu, usbenum.py shows 5 busses & all devices descriptors are displayed.
By the way, the device is something that I am developing. I'm using vendor specific class & subclass, no protocol. I've developed an application under Ubuntu & can read & write from the device without problems. Thanks Mark ------------------------------------------------------------------------------ _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users