[USRP-users] x310 full duplex capabilities/quirks

Michael Carosino m.carosino at gmail.com
Thu Jul 20 14:04:47 EDT 2017

As a follow up to this, I was successful in getting an example flowgraph
working using the UHD USRP Sink/Src blocks with 2 channels each. I've
attached the flow graph (note the blocks are disabled here) - on the
hardware I hook up A: TX/RX to A: RX2 and B: TX/RX to B: RX2 and it works
as expected.

However, I've not been successful in getting the same flowgraph setup using
the RFNoC blocks. These are the blocks that are enabled in the flowgraph.
You can see I've setup the first radio block to select radio A, in TX mode,
with 2 channels usings TX/RX for Ch0 and TX/RX for Ch1. Similarly the
second radio block uses radio B in RX mode with 2 channels using RX2 for
Ch0 and Rx2 for Ch1. Running this gives the error when attempting to
set_tx_freq "Path not found in tree:

I must be having some confusion about the subdev spec being replaced by
radio select in the RFNoC blocks. Previously I could specify to use A:0 B:0
in the USRP Sink however now it's just replaced by a single radio select so
I don't quite understand how to use different daughter boards for each TX
(similar question for RX side)

On Wed, Jul 19, 2017 at 9:54 AM, Michael Carosino <m.carosino at gmail.com>

> Hi all,
> as far as I'm aware, the two daughter boards on the x310 device each allow
> for full duplex communication simultaneously. In other words, I should be
> able to connect a string of (or a ring network too) for e.g. three x310
> devices together. Assuming the answer to that is yes, are there any
> specific quirks I should be aware of that will need to be tackled? I'm
> thinking of things like:
> -running multiple flowgraphs on one x310 for the multiple tx and rx
> chains, might need to mux data in/out somehow (only one process can use the
> x310 at a time?)
> -If it's not true full duplex, I assume some type of start of burst, end
> of burst tags are necessary?
> -Any example flowgraphs that have already shown the full use of the device
> like this?
> Thanks,
> Mike
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