Hello Dr Henarejos, Currently an RFNoC only flowgraph is not fully supported. What is missing is the issuing of the commands to start streaming and a mechanism to handle timestamps. Some modifications are needed to make these work. Nick Foster has done a write up on a few different ways of handling the necessary modifications.
https://corvid.io/2017/04/22/stupid-rfnoc-tricks-loopback/ Regards, Derek On Fri, Jun 22, 2018 at 10:10 AM, Pol Henarejos via USRP-users < usrp-users@lists.ettus.com> wrote: > Dear all, > > I am playing with RFNoC on a USRP X300. I built a custom RFNoC FPGA image > with the blocks that I need successfully and everything goes smooth. > However, if I want to use a flowgraph with only RFNoC blocks (RFNoC Radio > RX --> DmaFIFO --> RFNoC Radio TX), it does not work. The USRP does nothing > (no blinking leds, no error messages, nothing). If I replace the DmaFIFO > block with a Copy block, then it works but, as expected, this is not > efficient since all the samples go to the host and go back to the USRP. I > would want to perform a relay by using only RFNoC blocks. My impression is > that a command to the USRP might be needed (a streaming command or so), but > I have no idea what is wrong. > > I attach the flowgraph. > > (only RFNoC blocks does not work) > > (flowing samples to host and going back to USRP does work but it is > extremely inefficient) > > Thank you. > > > -- > > Dr. Pol Henarejos > Researcher > Array and Multi-Sensor Processing Department, Communication Systems > divisionpol.henare...@cttc.cat > > Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) > Av. Carl Friedrich Gauss, 7 > 08860 Castelldefels, Barcelona (Spain) > Tel: +34 93 645 29 00 Ext: 2177www.cttc.cat > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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