2014-07-31 14:48 GMT-03:00 Samuel Thurston :
>
> On 07/30/2014 05:51 PM, Wander Lairson Costa wrote:
>> 2014-07-30 15:01 GMT-03:00 Samuel Thurston :
>>> 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 "", line 1, in
>>> 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 "", line 1, in
>>> 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.
>
That's because I didn't tag b2 yet.
> Thanks very much for the fix!
>
You're welcome.
--
Best Regards,
Wander Lairson Costa
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