Re: [Discuss-gnuradio] GNU Radio 3.7.12 RFNoC set_start_time()

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 <rwilcox@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

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