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

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

Any suggestions on where to get the dll?
I've tried www.opendlls.com , but the checksums did not match.

On Mon, Feb 26, 2018 at 4:20 PM, Michael Hennebry <
mic...@ri...> wrote:

> 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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>
>