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From: Ian D. <it....@gm...> - 2011-11-29 18:31:01
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Not sure what's wrong, and no easy way of telling as dev.get_active_configuration() segfaults on OSX... Do you know to what endpoint you're trying to write? What hardware's attached? What functionality are you trying to expose? On Tue, Nov 29, 2011 at 12:06, Barney, Bryson <bb...@sa...> wrote: > Ok, I installed the binary backend in addition to the Python bindings. > Now it can find a backend, and I am pretty sure that it is finding my > device as well. When I run the script, it returns:**** > > ** ** > > <usb.core.Device object at 0x000000000251B080>**** > > Traceback (most recent call last):**** > > File “usb_test.py”, line 17, in <module>**** > > interface_number = cfg[0].bInterfaceNumber**** > > File “C:\Python27\usb\core.py”, line 459, in __getitem__**** > > return Interface(self.device, index[0], index[1], self.index)**** > > TypeError: ‘int’object is not sbuscriptable**** > > ** ** > > I am not sure how to solve this error. All I want to do in the end is > write the bytes 0x9F 0x02 0x05 and 0x01 to the device. Any ideas on how to > get past this? Thanks for the help by the way.**** > > ** ** > > Thanks,**** > > Bryson**** > > ** ** > > *From:* Ian Daniher [mailto:it....@gm...] > *Sent:* Tuesday, November 29, 2011 10:18 AM > *To:* pyu...@li... > *Subject:* [EXTERNAL] Re: [pyusb-users] "No backend available" error**** > > ** ** > > Do you have LibUSB installed? You'll need a binary backend in addition to > the Python bindings. **** > > ** ** > > You can follow the installation instructions located at > http://sourceforge.net/apps/trac/libusb-win32/wiki.**** > > ** ** > > On Tue, Nov 29, 2011 at 11:11, Barney, Bryson <bb...@sa...> wrote:* > *** > > Hi,**** > > **** > > I am new here, and a new user of PyUSB. I have a very simple HID > Isochronous application to use this for, so I thought that I would start > out by running the example that is shown in the “Programming with PyUSB > 1.0” tutorial. I am running this on windows 7 with python27**** > > **** > > I get through the following lines:**** > > **** > > import usb.core**** > > import usb.util**** > > **** > > # find our device**** > > dev = usb.core.find(idVendor=0xfffe, idProduct=0x0001)**** > > **** > > Then “ValueError: no backend abailable” appears, which is an error from > line 846 in core.py. It looks like I have all three backends (libusb01.py, > libusb10.py, and openusb.py) in the usb/backend directory. Do you by any > chance know why it cannot find a backend? Any help with this would be much > appreciated.**** > > **** > > Thanks,**** > > Bryson**** > > **** > > Just in case, here is the script that I am trying to run:**** > > **** > > **** > > import usb.core**** > > import usb.util**** > > **** > > # find our device**** > > dev = usb.core.find(idVendor=0x0B40, idProduct=0x0133)**** > > **** > > # was it found?**** > > if dev is None:**** > > raise ValueError('Device not found')**** > > **** > > # set the active configuration. With no arguments, the first**** > > # configuration will be the active one**** > > dev.set_configuration()**** > > **** > > # get an endpoint instance**** > > cfg = dev.get_active_configuration()**** > > interface_number = cfg[0].bInterfaceNumber**** > > alternate_settting = usb.control.get_interface(interface_number)**** > > intf = usb.util.find_descriptor(**** > > cfg, bInterfaceNumber = interface_number,**** > > bAlternateSetting = alternate_setting**** > > )**** > > **** > > ep = usb.util.find_descriptor(**** > > intf,**** > > # match the first OUT endpoint**** > > custom_match = \**** > > lambda e: \**** > > usb.util.endpoint_direction(e.bEndpointAddress) == \**** > > usb.util.ENDPOINT_OUT**** > > )**** > > **** > > assert ep is not None**** > > **** > > # write the data**** > > ep.write('test')**** > > **** > > **** > > **** > > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure > contains a definitive record of customers, application performance, > security threats, fraudulent activity, and more. Splunk takes this > data and makes sense of it. IT sense. And common sense. > http://p.sf.net/sfu/splunk-novd2d > _______________________________________________ > pyusb-users mailing list > pyu...@li... > https://lists.sourceforge.net/lists/listinfo/pyusb-users**** > > ** ** > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure > contains a definitive record of customers, application performance, > security threats, fraudulent activity, and more. Splunk takes this > data and makes sense of it. IT sense. And common sense. > http://p.sf.net/sfu/splunk-novd2d > _______________________________________________ > pyusb-users mailing list > pyu...@li... > https://lists.sourceforge.net/lists/listinfo/pyusb-users > > |