Re: [pyusb-users] Trouble specifying a backend on embedded.
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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Re: [pyusb-users] Trouble specifying a backend on embedded.
2014-07-31 14:48 GMT-03:00 Samuel Thurston samuel-thurs...@uiowa.edu:
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.
That's because I didn't tag b2 yet.
Thanks very much for the fix!
You're welcome.
--
Best Regards,
Wander Lairson Costa
--
Infragistics Professional
Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
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Re: [pyusb-users] Trouble specifying a backend on embedded.
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
--
Infragistics Professional
Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
Build a bridge from your legacy apps to the future.
http://pubads.g.doubleclick.net/gampad/clk?id=153845071iu=/4140/ostg.clktrk
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