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Re: Bulk Transaction timeouts

On Jul 21, 2005, at 2:32 AM, Florent Pillet wrote:

That did it! When I receive a timeout, calling ClearPipeStallBothEnds gets the endpoint back on its feet, and transactions can continue. Thanks for the tip, David, it wasn't even targeted to me but it turns out it helped a lot!


I would like to point out that this is specified in the documentation for ReadPipeTO:

If a timeout is specified and the request times out, the driver may need to resynchronize the data toggle. See ClearPipeStall or ClearPipeStallBothEnds .
 Timeouts do not apply to interrupt pipes, so you should use the ReadPipe call to perform a read from an interrupt pipe.

available in your hard drive at:

file:///Developer/ADC%20Reference%20Library/documentation/Darwin/Reference/IOKit/IOUSBLib/Classes/IOUSBInterfaceInterface190/Functions/Functions.html#//apple_ref/doc/inheritedContent/IOUSBInterfaceInterface190/ReadPipeTO/168

--
Fernando Urbina
USB Technology Team
Apple Computer, Inc.


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References: 
 >Bulk Transaction timeouts (From: Mike Smith <email@hidden>)
 >Re: Bulk Transaction timeouts (From: David Ferguson <email@hidden>)
 >Re: Bulk Transaction timeouts (From: Florent Pillet <email@hidden>)
 >Re: Bulk Transaction timeouts (From: Florent Pillet <email@hidden>)



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