Re: Pertaining to USB endpoints..

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On Fri, Nov 06, 2009 at 06:16:47PM +0530, Nicholas Van Orton wrote:
> Hello,
> 
> This is with regards to the USB protocol with respect to Endpoints.
> The general sequence of events followed would be
> 
> 1)Host sends data packet that ends up in the EP1 OUT
> 2)Device then returns data that ends up in EP1 IN
> 3)Host sends a IN packet requesting the data at EP1 IN
> 
> The question relates to the 3rd step above, where does the IN packet
> sent by the host
> end up? Will it end up in EP1 OUT or EP1 IN? Since this is from the host
> logically it should end up at EP1 OUT. Is this correct?

Endpoints are only one-direction, either from the host, or to the host,
so data can only go one way and you are correct.

Hope this helps,

greg k-h
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