Has anyone done any real time investigations with USB? I've started doing some investigations for another effort I'm working on and I'm finding that at least the USB2serial stack is absolutely awful real time characteristics. I mean really bad.
I know about USB bulk retries and on a busy hub you can get back ups of data throughput. However; for interrupt (which is actually a polling process) devices I wouldn't have expected too much jitter in delivery times. This all makes me wonder about how real time will Ischronous be even? Anyway do you guys have a real time aspect for the avionics that have USB in to critical path? If so we should do some prototyping. --mgross
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