Re: Hi all, I'm newbe, so apologize for my stupid questions.

Perfect, I understand now the scheme.

Thanks a lot.



Alle 20:10, domenica 23 settembre 2007, Alan Stern ha scritto:
> On Sun, 23 Sep 2007, Fabio Giovagnini wrote:
> > > > But why I have 64 expected and 8 actual?
> > >
> > > Because the kernel doesn't know the maxpacket size for endpoint 0,
> > > since it hasn't yet seen the Device Descriptor.  It guesses 64, but on
> > > your device the size is 8.  So the driver thinks your device has sent a
> > > short packet and it ends the data stage of the transfer.  It goes
> > > directly to the status stage without trying to read the other 10 bytes.
> > >
> > > Your device must be able to handle this.
> >
> > RE: Sorry Alan, how my device can handle this?
> > my Device Controller has to be configured with 8 bytes FIFO length and 8
> > bytes of max packet length for endpoint 0 biung the control endpoint.
> > I cannot specify during endpoint configuration the endpoint 0 has to be
> > cconfigured with max packet lentgh of 64 bytes.
> > Should I intercept the final status stage interrupt ad trasmit in it the
> > other bytes?
>
> Not exactly.  You should just treat the status stage interrupt as a
> normal status stage, and send back an ACK.  Then the kernel will
> have the first 8 bytes of your device descriptor, so it will know
> the correct maxpacket size for your endpoint 0.
>
> Alan Stern

-- 
Fabio Giovagnini

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