Greetings, I’m trying to open the RFNoC example file titled rfnoc_radio_loopback.grc, available at https://github.com/gnuradio/gnuradio/blob/main/gr-uhd/examples/grc/rfnoc_radio_loopback.grc. However, the file doesn’t open in GNU Radio Companion, and I receive the following error:
>>> Error: Connection between blocks_var_to_msg_0(msgout) and >>> uhd_rfnoc_rx_radio_0(command) could not be made. sink key 'command' not in sink block keys Error: too many values to unpack (expected 4) >>> Failure As a beginner, I’m unsure about the underlying cause of the issue. Could it be due to the example using deprecated or unsupported blocks in the latest version of GNU Radio? For context, I use a URSP X300, GNURadio version 3.10.7.0, UHD version UHD 4.2.0.HEAD-0-g46a70d85. I have all the necessary hardware prerequisites for running RFNoC on my USRP. I uploaded the FPGA image 39, which was released by Ettus research, onto my USRP. I even successfully ran various RFNoC GRC files on my system, including the DDC and DUC examples from the GitHub repository. For instance, when I executed the rfnoc_radio_ddc.grc example, I connected a signal generator to my SDR using a coaxial cable to input a sinusoidal signal. On running the flowgraph, I observed the sinusoid on the QT GUI Time Sink and its accurate spectrum on the Frequency Sink, confirming proper signal generation and analysis with RFNoC. The only issue is with the rfnoc_radio_loopback.grc file, which is the most important one for me at the moment, and I am unable to run that. Any guidance or suggestions on how to resolve this would be greatly appreciated. Thanks in advance!
