email@hidden said:
> The problem is that, at least with synchronous calls, IOKit does not seem
> to like the fact that I ask for only 1 byte from the read pipe when there
> may be more available (even if I'm in a loop and will immediately be
> asking for another byte). I get an IOReturnOverrun error.
This seems to indicate that even though we gave it a 1 byte buffer, the
device returned more than that (hence the overrun). The error does not come
from "IOKit" per se -- we are reporting what the OHCI controller told us.
I'm afraid that all the bytes that were transferred are gone, so you can't
get at them?
Can you look at the data on the bus and see what's going on? It seems that
the device is sending as much data as it can. Why don't you set the buffer
to be maxPacketSize and process however many bytes were sent?
--
Fernando Urbina mailto:email@hidden
USB Technology Team work: 719.534.9387
Apple Computer, Inc. fax: 719.532.0981
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