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 <xiaof...@gmail.com> ha scritto:
> On Wed, May 2, 2018 at 10:50 PM, Luigi Gubello <luigi.gube...@gmail.com>
> 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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