Yes I put it after the find() function.
Do I need add other configuration functions?
Cheers,
Tony
On 22 Feb 2013, at 00:29, Wander Lairson Costa <wander.lair...@gmail.com> wrote:
> 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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