Hi Kevin, Try issuing the stream command directly on the Radio block rather than the rx_streamer. I don't know why you are getting the warnings you are getting, but trying this step might produce a different result.
On another note, since you are using timed commands, there will be a time stamp in your received data stream. When this stream arrives at the Tx Radio after passing through the loopback path, it will be considered "Late" at the Tx Radio because the time stamp has passed. Your block will need to add an offset to the time stamp (or remove it) so that it won't be late when arriving at the Tx Radio. Rob On Thu, May 22, 2025 at 4:45 AM Kevin Williams <kevin.willi...@vastech.co.za> wrote: > Hi, > > > > I have an rfnoc block with two output ports which is feeding the splitter > block to duplicate each port. > > > > One pair is used to stream to the host, and the other is looped back to > the radio via the DUC block. > > > > The active connections are reported as: > > > > Active connections: > > * 0/Radio#0:0==>0/PolConverter#0:0 > > * 0/Radio#0:1==>0/PolConverter#0:1 > > * 0/PolConverter#0:0==>0/SplitStream#0:0 > > * 0/SplitStream#0:0-->0/DUC#0:0 > > * 0/PolConverter#0:1==>0/SplitStream#0:1 > > * 0/SplitStream#0:1-->0/DUC#0:1 > > * 0/DUC#0:0==>0/Radio#0:0 > > * 0/DUC#0:1==>0/Radio#0:1 > > * 0/SplitStream#0:2-->RxStreamer#0:0 > > * 0/SplitStream#0:3-->RxStreamer#0:1 > > > > I’m getting this warning when trying to stream (to the host and the TX): > > > > [WARNING] [0/Radio#0] Received stream command, but not to output port! > Ignoring. > > > > Along with debug info: > > > > [DEBUG] [RxStreamer#0] Received overrun message on port 0 > > [DEBUG] [RxStreamer#0] Received overrun message on port 1 > > L[DEBUG] [RxStreamer#0] Received late command message on port 0 > > [DEBUG] [RxStreamer#0] Received late command message on port 1 > > D > > > > I start the streaming with a timed command to the RX streamer like: > > > > rx_stream->issue_stream_cmd(stream_cmd); > > > > I’m not getting the red “TX” led illuminated on the N300, and I don’t > understand where or why these warnings are being created? > > > > Previous posts have mentioned this link ( > https://corvid.io/2017/04/22/stupid-rfnoc-tricks-loopback/) has helped > but it seems to be down. > > > > How does one get a loopback in the fpga from rfnoc blocks to the radio TX? > > > > BTW: in the firmware I tie TEOV and TEOB to my TLAST in my custom block. > > > > Many thanks, Kevin > > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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