Hello Reggie, I believe the issue you are encountering is that the streaming starts before the next PPS edge arrives and resets the USRP time to 0. Try adding a sleep for one second between the set_time_next_pps and the set_start_time. Some RFNoC features are not fully exposed in GNU Radio, but most are and others are being added over time and as a need is expressed.
Regards, Derek On Tue, Nov 14, 2017 at 2:00 PM, Reggie Wilcox <rwil...@haystack.mit.edu> wrote: > Hello, > > I'm trying to use the set_start_time() command on a RFNoC: Radio block > with a USRP X300. I am using the syntax to try to set the start time: > self.uhd_rfnoc_streamer_radio_0.set_time_next_pps(uhd.time_spec(0)); > self.uhd_rfnoc_streamer_radio_0.set_start_time(uhd.time_spec(15)); > > However, the radio begins transmitting immediately after running the > script instead of waiting for 15 seconds. Additionally, I know that there > is no start time set in any of the packets sent to the radio, confirmed > using a packet sniffer (wireshark). > > I am trying to understand where the error in this setup is. Am I not using > the correct syntax to set the start time, or are there some features that > are not yet fully supported with RFNoC in GNU Radio? For reference, I am > using version 3.7.12, which was installed with the rfnoc recipe in pybombs. > > Thanks, > > ~Reggie > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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