Re: [pyusb-users] ValueError: No backend available

[Michael H. <mic...@ri...>]

zadig gives me the following options:
libusbK (v 3.0.7.0)
libusb-win32 (v 1.2.6.0)
winUSB (v 6.1.7600.16385)
USB Serial (CDC)

The current libusb0 (v 1.2.6.0) was not obtained through zadig.
I think I got it by letting Windows go fish.

My recollection is that nothing from zadig worked with avrdude.
I want avrdude and python.so I don't have to go back and forth between
libraries.
I guess I'll have to try libusb-1.0 and hope it works.
'

On Fri, Feb 23, 2018 at 9:11 PM, Xiaofan Chen <xia...@gm...> wrote:

> On Thu, Feb 8, 2018 at 8:25 AM, Michael Hennebry
> <mic...@ri...> wrote:
> > I'm having trouble make pyusb work at all.
> > When typing usb stuff in interactive mode,
> > usb.core.find(...) either produces ant empty list
> > or something that prints as nothing.
> > \Python27\python search.py
> > produced ValueError: No backend available .
> > search.py :
> > import usb.core
> > import usb.util
> > import usb.control
> > import array
> > dev = usb.core.find(find_all=True)
> > print dev
> > dev = usb.core.find()
> > dev = usb.core.find(find_all=True, idVendor=0x045e, idProduct=0x0040)  #
> my
> > mouse
> > print dev
> > dev = usb.core.find(               idVendor=0x045e, idProduct=0x0040)  #
> my
> > mouse
> > print dev
> > dev = usb.core.find(find_all=True, idVendor=0x03eb, idProduct=0x2141)  #
> > Atmel ICE
> > print dev
> > dev = usb.core.find(               idVendor=0x03eb, idProduct=0x2141)  #
> > Atmel ICE
> > print dev
> >
> > I'm on Windows 10.
> > A find on libusb produces only files with names beginning libusb0.
> > How do I make pyusb work?
>
> pyusb supports libusb-win32 and libusb (aka libusb-1.0) under Windows.
> libusb-win32 is a bit old. So the better option is libusb Windows.
>
> 1) Use Zadig to install WinUSB driver to the device you are interested.
> https://github.com/libusb/libusb/wiki/Windows#driver-installation
>
> 2) Get latest version of libusb Windows binary (libusb-1.0.dll) and put
> it into a location your Python installation recognizes.
>
>
> --
> Xiaofan
>
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