Re: [usb] Zero length data packet?

["Vikas T Rao " <vikasraot@myw.ltindia.com>]

** 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@tataelxsi.co.in 12/24/02 11:20AM >>>


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