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
