From: vvyogi . <vv...@gm...> - 2013-10-03 18:33:18
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Again, Out of curiosity I was browsing through the * "C:\Python27\Lib\site-packages" *directory, and there was backend subdirectory inside the usb directory. And it had 1. libusb0.py 2. libusb1.py 3. openusb.py I quickly ran this code( as suggested by you(Wander Liarson) earlier): import usb.backend.libusb0 > b = usb.backend.libusb0.get_backend() > dev = usb.core.find(backend=b, idVendor=5824, idProduct=1503) > # was it found? > if dev is None: > raise ValueError('Device not found') > > print "VUSB Device Found" > print dev.bNumConfigurations > print dev.bDeviceClass > print dev.bLength > # set the active configuration. With no arguments, the first > # configuration will be the active one > dev.set_configuration() > dev.ret = dev.ctrl_transfer(0xC0, 0x00, 0, 0, 128) AND ITS DONE ! Its finally WORKING ! Awesome. Thanks and Regards Vivek On Thu, Oct 3, 2013 at 11:54 PM, vvyogi . <vv...@gm...> wrote: > 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 < > wan...@gm...> wrote: > >> 2013/10/3 vvyogi . <vv...@gm...>: >> >> 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 >> >> >> ------------------------------------------------------------------------------ >> October Webinars: Code for Performance >> Free Intel webinars can help you accelerate application performance. >> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most >> from >> the latest Intel processors and coprocessors. See abstracts and register > >> >> http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk >> _______________________________________________ >> pyusb-users mailing list >> pyu...@li... >> https://lists.sourceforge.net/lists/listinfo/pyusb-users >> > > |