I've been running Kbench and xfer-iso-read for a couple of days trying different buffer
setting on my highspeed device for isochronous data.
I noticed in the output from xfer-iso-read that I have a couple of empty packets at the start
of some frames. But by the pattern I transmitted I can tell I didnt miss any packets they
just got shifted back a microframe or two in time.
From examining the APIs that Kbench uses it didnt look like there was a way to determine
if I had got empty packets. Note I have not looked at the binary log files. My question is, "would i even see gaps in the buffer returned by the following excerpt from kBench.c?"
if (transferParam->Ep.PipeId & USB_ENDPOINT_DIRECTION_MASK)
{
handle->DataMaxLength = transferParam->Test->ReadLength;
success = K.ReadPipe(transferParam->Test->InterfaceHandle,
transferParam->Ep.PipeId,
handle->Data,
handle->DataMaxLength,
NULL,
&handle->Overlapped);
} |
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