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Message
From: Rudolf Usselmann <rudi@a...>
Date: 27 Dec 2002 11:04:46 +0700
Subject: Re: [usb] Zero length data packet?
On Fri, 2002-12-27 at 14:02, vsn@y... wrote:
> Hi
> Will not the device send NAK packet when it doesnt have data to send?
No NAK is only send in case of an error (PID, CRC, but stuff, etc.)
rudi
> vsn
>
> ----- Original Message -----
> From: "Vikas T Rao " <vikasraot@m... >
> To: <usb@o... >
> Date: Tue, 24 Dec 2002 14:39:23 +0530
> Subject: Re: [usb] Zero length data packet?
>
> >
> >
> > ** Proprietary **
> >
> > hi,
> >
> > the device's endpoint can send zero-length packets for
> > bulk/interrupt In transcations during any of the following
> > conditions.
> >
> > 1. if the last packet is equal to max. packet size and there is no
> > further data to be sent.
> > 2. if the host sends an IN (due to some reasons) even though the
> > device has sent the last packet less than the max. packet size.
> > 3. if there is no data available on the device side at all.
> >
> > in the last 2 reasons, why host is sending IN and why device has no
> > data at all, depends on the implementations aspects of host or
> > device.
> >
> > ...vikas.
> >
> > >>> skashyap@t... 12/24/02 11:20AM >>>
> >
>
>
>
--
rudi
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