2014-05-21 3:00 GMT-03:00 Slavko Kocjancic <esla...@gmail.com>:
> On 05/21/2014 03:36 AM, Wander Lairson Costa wrote:
>> 2014-05-20 13:26 GMT-03:00 Slavko Kocjancic <esla...@gmail.com>:
>>> Hello...
>>>
>>> I'm new to python (and pyusb).
>>> I try to port some VUSB device to work with python, but get at trouble
>>> in beggining. I can't send bytes...
>>> here is my example (stripped from manual...)
>>>
>>> import usb.core
>>> import usb.util
>>>
>>> from array import *
>>> dev = usb.core.find(idVendor=0x16c0, idProduct=0x05df)
>>> if dev is None:
>>> raise ValueError('Device not found')
>>> dev.set_configuration()
>>>
>>> msg = 'test'
>>> print dev.ctrl_transfer(32+128, 9, 0, 0, msg)
>>>
>> I guess the first argument should be just 32.
>
> Well I want write. And bit 7 of first argument tells if this is write or
> read.
> and msg (at least by manual) behave as buffer for tx, and integer for
> size in receive mode.
>
Yes, with this bit set, the request is an IN transfer, and the `msg`
parameter is (wrongly) interpreted as the length of the transfer.
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