Hello Alex, Dave is correct that RFNoC does not currently support a loopback that does not include the host. This is a functionality which Ettus is aware is keenly desired by some users but we do not have a timeline for it being natively supported. The post that Dave linked to describes how to make such a loopback work currently.
Regards, Derek On Wed, Jul 11, 2018 at 12:39 PM, Dave NotTelling via USRP-users < usrp-users@lists.ettus.com> wrote: > I seem to recall that you can't actually do a loopback like that in > RFNoC. I think you have to send samples to the host at some point. A > quick Google search came up with [1]. I'd be really interested if there > were a way to do a HW only loopback with RFNoC natively. > > [1] https://corvid.io/2017/04/22/stupid-rfnoc-tricks-loopback/ > > On Mon, Jul 9, 2018 at 4:21 PM Weihan Chen via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hi, >> >> I'm new to RFNOC development. I have an X310 with an SBX on slot A, and I >> want to do a loopback from antenna port RX2 to TX/RX using RFNOC blocks. I >> tried connecting 0/Radio_0 ==> 0/DDC_0 ==> 0/DUC_0 ==> 0/Radio_0 by the >> following commands: >> >> rx_graph->connect(radio_ctrl->get_block_id(), ddc_ctrl->get_block_id()); >> rx_graph->connect(ddc_ctrl->get_block_id(), >> duc >> _ctrl->get_block_id()); >> rx_graph->connect(duc_ctrl->get_block_id(), radio_ctrl->get_block_id()); >> >> and UHD gives me Error: RuntimeError: On node 0/Radio_0, output port 0 is >> already connected. >> >> What am I doing wrong here? Please help. >> >> Regards, >> Alex >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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