I believe you have to make sure that "end-of-burst" is set and wait for an ACK
from the USRP. This allows the FPGA buffers to clear, at which point you should be able
to start RX. Someone please correct me if I'm wrong :)
Sean
Yup. In .../uhd/examples/tx_burst.cpp
Shows how this is done using the raw UHD interface (not mediated by Gnu
Radio).
There are latencies involved in many parts of the "stack", so if you
want to know that it's safe to
start receiving, you have to wait for the End-Of-Burst ACK. When you
"->send()" a lump of data
in UHD, when that send completes, it only means that the OS kernel
has accepted the data. It doesn't
mean that the ethernet interface has transmitted, or that the other
end has finished receiving it, or that
the FPGA is finished with it and the last sample has left the DAC.
That's what the EOB-ACK protocol is
about.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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