Perhaps try setting the radio SPP = FFT length? On Thu, Jan 21, 2021 at 10:38 AM Mattingly, Rylee via USRP-users < [email protected]> wrote:
> Hi all, > > I am trying (and failing) to get an RFNoC image with the provided FFT > working with GNURadio. I am using an X310 connected with a 1Gig ethernet > and building images in the HG configuration. > I used the knowledge base article: "Getting Started with RFNoC in UHD 4.0" > (linked here: https://kb.ettus.com/Getting_Started_with_RFNoC_in_UHD_4.0) > to add the FFT to the default image. > The resulting image core with FFT can be found here: > https://pastebin.com/xLqyx7qS > > The uhd probe shows the fft correctly connected to through its own SEP. > However, when I attempt to run a flowgraph containing the FFT I get a > recv() timeout error and then blocks will not flush unitl the USRP is > reset. One of the many flow graphs I have tried, and the consistent error > are shown in the screenshots here: https://pasteboard.co/JKFUlrH.png and > here: https://pasteboard.co/JKFTHji.png > > I then tried using the UHD Python API deriving from the example shown in > the GRCon20 session "Exploring RFNoC with the UHD Python API" by Aaron > Rossetto. Here I find that a static loopback example like Aaron presented > with the FFT worked with one length of samples but trying to extend that > for streaming from the radio creates the same behavior that is exhibited > with GNURadio. The only way that I can get the FFT to execute correctly is > if I stream exactly one FFT length of samples. Any larger number of samples > from the radio (even length multiple) will crash the block and requires a > power cycle to be able to flush again. > > Loopback example code: https://pastebin.com/03dScZvB > Streaming test code: https://pastebin.com/WQRn7UhH > > I have been able to build and use custom RFNoC blocks sucessfully with > GNURadio on this installation of UHD 4.0, GNURadio 3.8 and gr-ettus. > > Thank you, > > Rylee > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
_______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
