2005/9/6, Alan Stern <[EMAIL PROTECTED]>:
> On Mon, 5 Sep 2005, Franck wrote:
>
> > Alan,
> >
> > 2005/9/5, Alan Stern <[EMAIL PROTECTED]>:
> > > On Mon, 5 Sep 2005, Franck wrote:
> > >
> > > > > On the other hand, it's not really all that much useless work. 4
> > > > > times
> > > > > per second or so there's a single, very short transaction (IN
> > > > > followed by
> > > > > NAK). Unless you've got some good reason for avoiding it, why bother?
> > > > >
> > > >
> >
> > Can you point out in the code where is the setup of 4 times per second
> > interval ? I can't find it.
>
> It's in drivers/usb/core/hub.c. The URB is set up near the end of
> hub_configure(), and it is submitted in hub_activate(). Search for
> occurrences of "hub->urb". The requested period is endpoint->bInterval,
> taken from the hub's endpoint descriptor.
>
Thanks Alan for your answer, but I was looking at the part which send
a "get endpoint descriptor" request and setup "endpoint->bInterval"
Thanks again.
--
Franck
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