On Thursday 27 April 2006 6:41 am, Peter.Chen wrote:
> 
> I have another question:
> in eq0_irq routine:
> 
> there are such cases:EP0_IN_DATA_PHASE,and EP0_OUT_DATA_PHASE
> (eg.at pxa2xx.udc).

Those states are very specific to the pxa25x hardware, and I don't
think they match well to any other silicion.  In fact they're
rather iffy for the pxa25x and the only reason they're used is
to match the flakey/incomplete docs from Intel.


> maybe for SET_DESCRIPTOR ,GET_DESCRIPTOR,etc 
> right?
> 
> and there are USB_REQ_GET_DESCRIPTOR ,USB_REQ_SET_DESCRIPTOR 
> at standard_setup_req routine
> at file_storage.c ,we will use it when we invode udc->driver->setup
> 
> So,i am puzzled,which way we will use?

Which of *_PHASE?  Probably none of them, your hardware probably
doesn't use those phasees.

Which USB_REQ_*?  Whichever one the host provided in its SETUP
packet.


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