Did you try the latest version on github [1] ?
[1] https://github.com/walac/pyusb
2013/7/17 Elizabeth Tolman <etol...@princeton.edu>:
> Thanks for helping me out! Here is all of the info about the device:
>
> bus-0/\\.\libusb0-0005--0x1a86-0xe008 1A86/E008
> - Manufacturer : WCH.CN
> - Product : USB to Serial
> wTotalLength: 41
> bNumInterfaces: 1
> bConfigurationValue: 1
> iConfiguration: 4
> bmAttributes: 80h
> MaxPower: 50
> bInterfaceNumber: 0
> bAlternateSetting: 0
> bNumEndpoints: 2
> bInterfaceClass: 3
> bInterfaceSubClass: 0
> bInterfaceProtocol: 0
> iInterface: 0
> bEndpointAddress: 82h
> bmAttributes: 03h
> wMaxPacketSize: 8
> bInterval: 5
> bRefresh: 0
> bSynchAddress: 0
> bEndpointAddress: 02h
> bmAttributes: 03h
> wMaxPacketSize: 8
> bInterval: 5
> bRefresh: 0
> bSynchAddress: 0
>
>
> And here is the output of the debugging:
>
>
> 2013-07-18 00:24:32,960 ERROR:usb.backend.libusb10:Error loading libusb 1.0
> back
> end
> Traceback (most recent call last):
> File "C:\Python27\lib\site-packages\usb\backend\libusb10.py", line 648, in
> get
> _backend
> _lib = _load_library()
> File "C:\Python27\lib\site-packages\usb\backend\libusb10.py", line 198, in
> _lo
> ad_library
> l = WinDLL(libname)
> File "C:\Python27\lib\ctypes\__init__.py", line 365, in __init__
> self._handle = _dlopen(self._name, mode)
> TypeError: expected string or Unicode object, NoneType found
> 2013-07-18 00:24:32,963 ERROR:usb.backend.openusb:Error loading OpenUSB
> backend
> Traceback (most recent call last):
> File "C:\Python27\lib\site-packages\usb\backend\openusb.py", line 701, in
> get_
> backend
> _lib = _load_library()
> File "C:\Python27\lib\site-packages\usb\backend\openusb.py", line 248, in
> _loa
> d_library
> raise OSError('USB library could not be found')
> OSError: USB library could not be found
> 2013-07-18 00:24:32,970 INFO:usb.core:find(): using backend
> "usb.backend.libusb0
> 1"
> 2013-07-18 00:24:32,970
> DEBUG:usb.backend.libusb01:_LibUSB.enumerate_devices()
> 2013-07-18 00:24:38,154
> DEBUG:usb.backend.libusb01:_LibUSB.get_device_descriptor
> (<usb.backend.libusb01._usb_device object at 0x0189DE90>)
> 2013-07-18 00:24:38,155
> DEBUG:usb.backend.libusb01:_LibUSB.get_device_descriptor
> (<usb.backend.libusb01._usb_device object at 0x0189DF30>)
> 2013-07-18 00:24:38,157
> DEBUG:usb.backend.libusb01:_LibUSB.get_device_descriptor
> (<usb.backend.libusb01._usb_device object at 0x018A30D0>)
> 2013-07-18 00:24:38,157
> DEBUG:usb.backend.libusb01:_LibUSB.get_device_descriptor
> (<usb.backend.libusb01._usb_device object at 0x018A3170>)
> Device found
> 2013-07-18 00:24:38,158
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,160
> DEBUG:usb.backend.libusb01:_LibUSB.open_device(<usb.back
> end.libusb01._usb_device object at 0x018A3170>)
> 2013-07-18 00:24:38,160
> DEBUG:usb.backend.libusb01:_LibUSB.set_configuration(650
> 3984, 1)
> 2013-07-18 00:24:38,161
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,161
> DEBUG:usb.backend.libusb01:_LibUSB.get_interface_descrip
> tor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0)
> 2013-07-18 00:24:38,163
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,163
> DEBUG:usb.backend.libusb01:_LibUSB.get_interface_descrip
> tor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0)
> 2013-07-18 00:24:38,164
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,164
> DEBUG:usb.backend.libusb01:_LibUSB.get_endpoint_descript
> or(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0, 0)
> 2013-07-18 00:24:38,164
> DEBUG:usb.backend.libusb01:_LibUSB.get_interface_descrip
> tor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0)
> 2013-07-18 00:24:38,165
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,165
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,167
> DEBUG:usb.backend.libusb01:_LibUSB.get_interface_descrip
> tor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0)
> 2013-07-18 00:24:38,167
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,167
> DEBUG:usb.backend.libusb01:_LibUSB.get_interface_descrip
> tor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0)
> 2013-07-18 00:24:38,168
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,170
> DEBUG:usb.backend.libusb01:_LibUSB.get_endpoint_descript
> or(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0, 0)
> 2013-07-18 00:24:38,170
> DEBUG:usb.backend.libusb01:_LibUSB.get_interface_descrip
> tor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0, 0, 0)
> 2013-07-18 00:24:38,171
> DEBUG:usb.backend.libusb01:_LibUSB.get_configuration_des
> criptor(<usb.backend.libusb01._usb_device object at 0x018A3170>, 0)
> 2013-07-18 00:24:38,171
> DEBUG:usb.backend.libusb01:_LibUSB.claim_interface(65039
> 84, 0)
> 2013-07-18 00:24:38,171
> DEBUG:usb.backend.libusb01:_LibUSB.intr_read(6503984, 13
> 0, 0, 130, 8)
> Traceback (most recent call last):
> File "testforquestion.py", line 62, in <module>
> main()
> File "testforquestion.py", line 55, in main
> data = endpoint.read(0x082, 8)
> File "C:\Python27\lib\site-packages\usb\core.py", line 301, in read
> return self.device.read(self.bEndpointAddress, size, self.interface,
> timeout
> )
> File "C:\Python27\lib\site-packages\usb\core.py", line 654, in read
> self.__get_timeout(timeout)
> 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\libusb01.py", line 501, in
> int
> r_read
> timeout)
> File "C:\Python27\lib\site-packages\usb\backend\libusb01.py", line 568, in
> __r
> ead
> timeout
> File "C:\Python27\lib\site-packages\usb\backend\libusb01.py", line 384, in
> _ch
> eck
> raise USBError(errmsg, ret)
> usb.core.USBError: [Errno None] usb_reap: timeout error
> 2013-07-18 00:24:38,211
> DEBUG:usb.backend.libusb01:_LibUSB.release_interface(650
> 3984, 0)
> 2013-07-18 00:24:38,211
> DEBUG:usb.backend.libusb01:_LibUSB.close_device(6503984)
>
>
>
> On Wed, Jul 17, 2013 at 5:49 PM, Wander Lairson Costa
> <wander.lair...@gmail.com> wrote:
>>
>> 2013/7/17 Elizabeth Tolman <etol...@princeton.edu>:
>> > I'm running Windows 7. I can get a bit of information about the device
>> > from the test program of libusb, if that would be helpful for you. I'm
>> > having a bit of trouble understanding how to use the debug feature.
>> > When I
>> > type "export PYUSB_DEBUG_LEVEL=debug" into the Python command line, I
>> > get
>> > an error message with "invalid syntax."
>> >
>>
>> Please, post here the information about you device (configurations,
>> interfaces, endpoints, etc..)
>>
>> --
>> Best Regards,
>> Wander Lairson Costa
>>
>>
>> ------------------------------------------------------------------------------
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>> _______________________________________________
>> pyusb-users mailing list
>> pyusb-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>
>
> ------------------------------------------------------------------------------
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> Get end-to-end visibility with application monitoring from AppDynamics
> Isolate bottlenecks and diagnose root cause in seconds.
> Start your free trial of AppDynamics Pro today!
> http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk
> _______________________________________________
> pyusb-users mailing list
> pyusb-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
--
Best Regards,
Wander Lairson Costa
------------------------------------------------------------------------------
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