2013/2/21 Tony Liu <tonynoth...@gmail.com>:
> Hi all,
>
> I'm new to PyUSB, and now i'm working on communicating with a costumed chip.
> The chip use two endpoint and one is use for in and another for out, and the
> manufacturer told me just to send raw date to it with different value of
> command.
>
> When I try this:
>
> buf = struct.pack("b",2)
>
> buf1 = struct.pack("b",0)
>
> print(buf+buf1+buf1)
>
> device.write(0x81,buf+buf1+buf1,0,100)
>
>
> I got the error of
>
> Traceback (most recent call last):
>
> File "/Users/tonyliu/Documents/Aptana Studio 3
> Workspace/Final-Year-Project/Test/USB_Test.py", line 81, in <module>
>
> device.write(0x81,buf+buf1+buf1,0,100)
>
> File
> "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/usb/core.py",
> line 626, in write
>
> self.__get_timeout(timeout)
>
> File
> "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/usb/backend/libusb1.py",
> line 532, in bulk_write
>
> timeout)
>
> File
> "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/usb/backend/libusb1.py",
> line 631, in __write
>
> _check(retval)
>
> File
> "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/site-packages/usb/backend/libusb1.py",
> line 403, in _check
>
> raise USBError(_str_error[ret], ret, _libusb_errno[ret])
>
> usb.core.USBError: [Errno 60] Operation timed out
>
> Exception AttributeError: "'NoneType' object has no attribute 'libusb_exit'"
> in <bound method _Initializer.__del__ of <usb.backend.libusb1._Initializer
> object at 0x101134ad0>> ignored
>
>
> Is this means I do not send data correctly or other?
>
>
In general, you should at least call set_configuration() before trying
to talk to a device. Have you done that?
--
Best Regards,
Wander Lairson Costa
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