On 07/30/2014 05:51 PM, Wander Lairson Costa wrote:
> 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
>
That worked perfectly. My only remark is that the tarball is labelled
1.0.0b1 but the installed version is listed as 1.0.0b2.
Thanks very much for the fix!
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