[USRP-users] RFNoC AddSub example error

Martin Braun martin.braun at ettus.com
Mon Mar 28 12:49:50 EDT 2016


this is a GNU Radio issue we still need to find a fix for. You've
probably connected output 0 to an RFNoC block, and output 1 to a GNU
Radio block. That'll confuse GNU Radio. We don't have a good solution
right now, but do you need the 'sub' output? If not, you can just leave
it hanging.


On 03/26/2016 08:54 PM, Sam Carey via USRP-users wrote:
> Howdy,
> When I try to run the rfnoc_adder.grc example, it throws this error:
> thread[thread-per-block[2]: <block uhd_rfnoc_AddSub (1)>]: RuntimeError:
> On node 0/AddSub_0, input port 0 is already connected.
> This is with a fresh install of uhd rfnoc-devel branch and the standard
> rfnoc image. Other RFNoC blocks seem to work fine.
> Do you know what might be wrong?
> Thanks,
> Sam
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