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 . <vvy...@gmail.com> 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 <
> 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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>
>
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