Are there more than one FIFOs in the flowgraph? If so, you may need to set the FIFO Select on each FIFO to select which FIFO block to use.
Royce > On Aug 9, 2019, at 2:36 PM, d.des via USRP-users <usrp-users@lists.ettus.com> > wrote: > > The latest version of AN-315 > https://kb.ettus.com/Software_Development_on_the_E3xx_USRP_-_Building_RFNoC_UHD_/_GNU_Radio_/_gr-ettus_from_Source > is a very nice update. It was great to be able to build a more-up-to- > date version of UHD error-free. There still seem to be issues getting > the example or my own blocks to run in Gnuradio, however. > > Following the instructions when I run rfnoc_fosphor_network_usrp.py > I get > RuntimeError: RuntimeError: On node 0/FIFO_0, input port 0 is already > connected. > > I suspect that there may be a difference in the version of gr-ettus > that the the author used and the one I get from git following the > instructions. One hint is that the file size for > rfnoc_fosphor_network_usrp.py in the document is slightly different > than my copy generated following the instructions. Alternatively, maybe > Nate left out a few steps in modifying the python generated by GRC > before running it. I'm also having trouble running my own blocks and > examples such as addsub and gain with fresh-build FPGA images. These > images run fine in rfnoc_rx_to_file, but they segfault when gnuradio > attempts to connect the output of my blocks to anything else. I'm > hoping that it's all related and the fosphor is a good example case to > help a user such as myself get running. > > I Googled the port connection error and found some threads that > indicated that it was a known issue back in 2017. Since Nate had it > working so rececently when he updated the Application Note I hope that > he can share the last few pieces of the puzzle. > > > _______________________________________________ > 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
