2014-07-30 15:01 GMT-03:00 Samuel Thurston <samuel-thurs...@uiowa.edu>:
> Hello all,
>
> I'm trying to use pyusb on an embedded yocto linux running on an intel
> Galileo board. I'm running into problems trying to load the custom
> backend as specified in the tutorial page. Since there is no compile
> environment I'm missing ldconfig. When I go to get a handle to the
> device the "normal way" I get this error:
>
> >>> dev = usb.core.find(idVendor = vid, idProduct = pid)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/usr/lib/python2.7/site-packages/usb/core.py", line 864, in find
> raise ValueError('No backend available')
> ValueError: No backend available
>
> I located the library to link at /lib/libusb-1.0.so.0
>
> so I tried to use the method described to specify a "find_library" function.
>
>
> >>>
> >>> backend = usb.backend.libusb1.get_backend(find_library=lambda x:
> "/lib/libusb-1.0.so.0")
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: get_backend() takes no arguments (1 given)
>
>
> I don't really understand the mechanism at play here, so I don't have
> any ideas for next steps. If anyone can provide some guidance I'd be
> very grateful.
>
> for what it's worth, here's the DATA section from help(usb)
>
> DATA
> __all__ = ['legacy', 'core', 'backend', 'util']
> __author__ = 'Wander Lairson Costa'
> __version__ = '1.0.0b1'
>
>
Hmm, unfortunately this feature is not available on any tagged version
yet. Could you please test with [1] ?
[1] https://github.com/walac/pyusb/tarball/master
--
Best Regards,
Wander Lairson Costa
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