Re: Please help installing libusb-32.

On Wed, Sep 12, 2018 at 3:05 PM Xiaofan Chen <[email protected]> wrote:
>
> On Wed, Sep 12, 2018 at 2:38 PM Dmitry Donskoy <[email protected]> wrote:
> >
> > The thing is that before I install libusb-win32, Windows uses "HID UPS
> > Battery", that works stable (doesn't disconnect and connect), though it
> > doesn't work with NUT.
> >
>
> I understand -- this means that the NUT program and the "HID UPS Battery"
> application behaves differently and that probably affects the device to go
> into some kind of fault and then can not handling the Windows request
> properly. Still libusb-win32 itself can not help you -- it does not handling
> the Windows enumeration.
>
> BTW, I think NUT program should be upgraded to use HIDAPI
> instead of libusb-0.1 API or even libusb-1.0 API to be have better
> support under Windows and Mac OS X.
>

You can try some software or HW USB analyzer to debug the issue to
see why the device goes to fault.
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-event-tracing-for-windows

libusb-win32 debug version may help a bit as well -- you need to use
Microsoft DebugView to see the se debug printout to see the communication
between NUT and the device.


-- 
Xiaofan