Re: [pyusb-users] reading interrupt endpoints

[Wander L. C. <wan...@gm...>]

2012/12/16 ragman <ga...@gm...>:
> Hi Folks,
>
> USB newbie here.  I'm trying to (understand and)  read data from an
> interrupt endpoint:
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0008  1x 8 bytes
>         bInterval               8
>
> using:
>  print dev.read(0x81,8,0,1000)
>
> But I'm getting timouts every time, no matter the timout setting.  As
> I'm still learning USB I'm guessing I misunderstand (most of it)
> interuppt endpoints.
>
> busdog shows me that the native software reads 2 bytes device every 60 seconds.
> Any help would be...helpful and much appreciated.
>

Did you issue a set_configuration()?

-- 
Best Regards,
Wander Lairson Costa