2014-05-21 14:08 GMT-03:00 Slavko Kocjancic <esla...@gmail.com>:
> On 05/21/2014 05:27 PM, Wander Lairson Costa wrote:
>> 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.
>
> I realized that when I wan't to read from device. I'm interpreted this
> bit just opposite. But have other problem with win driver and take a lot
> of time to discover what are wrong. At least it works now.
>
>
You can use the util.build_request_type function to avoid bit mistakes.
--
Best Regards,
Wander Lairson Costa
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