Re: [usb] Zero length data packet?

[vsn@yahoo.com]

Hi
Will not the device send NAK packet when it doesnt have data to send?
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 >>> 
> 
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