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 <bbar...@sandia.gov> 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.dani...@gmail.com]
> *Sent:* Tuesday, November 29, 2011 10:18 AM
> *To:* pyusb-users@lists.sourceforge.net
> *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 <bbar...@sandia.gov> 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
> pyusb-users@lists.sourceforge.net
> 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
> pyusb-users@lists.sourceforge.net
> 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
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