Re: [pyusb-users] Nike+ Sportband - Dump data - [Errno 110] Operation timed out

[Luigi G. <lui...@gm...>]

Ok, I start to understand, thank you for the input :)

Saluti, Luigi

Il Gio 3 Mag 2018, 10:04 Luigi Gubello <lui...@gm...> ha scritto:

> I'm reading usbmadesimple.co.uk and beyondlogic.org/usbnutshell but I do
> not understand a fact:
>
> Without reading the C code, but using only pyusb, how do I understand that
> there is a Control (IN / OUT) endpoint?
>
> With pyusb I read only "ENDPOINT 0x81: Interrupt IN". I'm doing a lot of
> things wrong.
>
> Thank you so much
>
>
> Saluti, Luigi
>
> Il Gio 3 Mag 2018, 02:50 Xiaofan Chen <xia...@gm...> ha scritto:
>
>> On Wed, May 2, 2018 at 10:50 PM, Luigi Gubello <lui...@gm...>
>> wrote:
>> > Hi,
>> >
>> > Nike has decided to close support for some products. So I have decided
>> to
>> > try to extract data from my Nike+ Sportband USB, by using Python and
>> PyUSB.
>> > I always get this error:
>> >
>> > 'usb.core.USBError: [Errno 110] Operation timed out'
>> >
>> > I have written a post on Stack Overflow, where there is my python code:
>> >
>> >
>> https://stackoverflow.com/questions/50117520/extract-data-from-nike-sportband-with-pyusb-on-debian
>> >
>> > I found a C code that works, but I can not do the same with Python. You
>> can
>> > read the C code here:
>> >
>> > http://knz-blue.cocolog-nifty.com/memo/files/SportBandGetTrack.c
>> >
>> > I have read this topic:
>> >
>> >
>> http://pyusb-users.narkive.com/sUHXq7uY/usb-core-usberror-errno-110-operation-timed-out
>> >
>> > It seems to be the same problem. Can you help me?
>> > Thank you!
>>
>>
>> As mentioned in the StackOverflow answer, your pyusb code is different
>> from the C
>> code. You need to send a Control OUT (write) transfer first and then
>> carry out
>> Control IN (read) transfer first.
>>
>> For the endpoint, Control IN is 0x80. Control OUT is 0x0.
>>
>> You can read basic of USB here.
>> http://www.usbmadesimple.co.uk/
>>
>> --
>> Xiaofan
>>
>>
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>