Try to put it in C:\Python27
>
That made no difference.
Out of curiosity, I removed the dll from System32 directory and yet pyUsb
didn't complained anything. This inspires me to ask "Where exactly is
pyUsb's backend? Which dll is it using?"
And Finally, I wiped out the python distribution completely and tried with
a fresh install. I installed only pyUSB( master branch from github ) Log
seems to be changed:
2013-10-03 23:44:23,200 DEBUG:usb.backend.libusb1:_LibUSB.__init__(<WinDLL
> 'C:\openocd-0.7.0\bin\libusb-1.0.dll', handle 6b600000 at 1804490>)
> 2013-10-03 23:44:23,201 INFO:usb.core:find(): using backend
> "usb.backend.libusb1"
> 2013-10-03 23:44:23,203
> DEBUG:usb.backend.libusb1:_LibUSB.enumerate_devices()
> 2013-10-03 23:44:23,263
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x018A5630>)
> 2013-10-03 23:44:23,263
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x018A56D0>)
> 2013-10-03 23:44:23,263
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x018A5690>)
> 2013-10-03 23:44:23,263
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x018A56F0>)
> 2013-10-03 23:44:23,265
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x018A5630>)
> 2013-10-03 23:44:23,265
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x018A56D0>)
> 2013-10-03 23:44:23,265
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x018A5690>)
> 2013-10-03 23:44:23,265
> DEBUG:usb.backend.libusb1:_LibUSB.get_configuration_descriptor(<usb.backend.libusb1._Device
> object at 0x018A5690>, 0)
> 2013-10-03 23:44:23,266
> DEBUG:usb.backend.libusb1:_LibUSB.open_device(<usb.backend.libusb1._Device
> object at 0x018A5690>)
> 2013-10-03 23:44:23,266
> DEBUG:usb.backend.libusb1:_LibUSB.set_configuration(<usb.backend.libusb1._DeviceHandle
> object at 0x01776930>, 1)
> VUSB_HID Device Found
> 1
> 255
> 18
> Traceback (most recent call last):
> File "myu.py", line 24, in <module>
> dev.set_configuration()
> File "C:\Python27\lib\site-packages\usb\core.py", line 559, in
> set_configuration
> self._ctx.managed_set_configuration(self, configuration)
> File "C:\Python27\lib\site-packages\usb\core.py", line 92, in
> managed_set_configuration
> self.backend.set_configuration(self.handle, cfg.bConfigurationValue)
> File "C:\Python27\lib\site-packages\usb\_debug.py", line 60, in do_trace
> return f(*args, **named_args)
> File "C:\Python27\lib\site-packages\usb\backend\libusb1.py", line 741,
> in set_configuration
> _check(self.lib.libusb_set_configuration(dev_handle.handle,
> config_value))
> File "C:\Python27\lib\site-packages\usb\backend\libusb1.py", line 571,
> in _check
> raise USBError(_str_error[ret], ret, _libusb_errno[ret])
> usb.core.USBError: [Errno 2] Entity not found
> 2013-10-03 23:44:23,285
> DEBUG:usb.backend.libusb1:_LibUSB.close_device(<usb.backend.libusb1._DeviceHandle
> object at 0x01776930>)
> 2013-10-03 23:44:23,285 DEBUG:usb.backend.libusb1:_LibUSB.__del__()
The error code is same "*[Errno 2] Entity not found*" however, pyUsb seems
to be using the libusb1 backend now.
I don't really understand whats going on here. Is there anyway I can make
it work?
Thanks and Regards
Vivek
On Thu, Oct 3, 2013 at 9:07 PM, Wander Lairson Costa <
wander.lair...@gmail.com> wrote:
> 2013/10/3 vvyogi . <vvy...@gmail.com>:
> >> Python is not finding the libusb-win32.dll file, you could put it
> >>
> >> inside the python interpreter directory just for tests
> >
> >
> > The directory C:\Python27\DLLs contains libusb0.dll, this same file is
> also
> > there in C:\Windows\System32 directory.
> > I removed the dll from C:\Python27\DLLs and I ran my program, it gave the
> > same error log( as if removing the dll made no difference). Does this
> means
> > that pyUsb is using backend from system32(or I am looking at the wrong
> > directory).
>
> libusb 1.0 has higher priority when detecting which backend to use.
> That's because I told you to force it through the *backend* find
> parameter.
>
> [snip]
>
> >
> > Now about the libusb-win32.dll, I couldn't locate this dll.
> > In the libusb-win32 distribution there i a libusb0_x86.dll, is this the
> > required dll that I need to put in C:\Python27\DLLs ?
>
> My bad, I told you the name of the dll was libusb-win32.dll, it is
> actually libusb0.dll. Sorry.
>
> > Kindly suggest where to look for the dll and where to put it ?
> >
>
> Try to put it in C:\Python27
>
>
>
>
>
>
> --
> Best Regards,
> Wander Lairson Costa
>
>
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