Hi Derek, I have two questions about the rx timed samples example, 1. is there python version for timed command? 2. Is the time stamp from the clock on USRP or on the host?
Thanks Zhongyuan Zhao PhD Candidate, Department of Computer Science & Engineering, University of Nebraska-Lincoln Office Hour: WF 9:30-10:00am, Avery Hall 12, Suite 117, Schorr Center, Lincoln, Nebraska 68588-0115 On Thu, Mar 8, 2018 at 3:27 PM, Derek Kozel via USRP-users < usrp-users@lists.ettus.com> wrote: > The stream command object has a field for a time spec of when to start > streaming and a boolean flag for whether to make use of that time spec. > http://files.ettus.com/manual/structuhd_1_1stream__cmd__t.html > > Here we can see it used in an rx example. > https://github.com/EttusResearch/uhd/blob/maint/host/examples/rx_timed_ > samples.cpp#L92-L93 > > Usually it is most practical to make a call to get_time_now() and then add > an offset from that time which is returned. The minimum offset would be the > roundtrip command time, usually a few milliseconds. > > Regards, > Derek > > On Thu, Mar 8, 2018 at 9:03 PM, Andrew Thommesen <andrewjoh...@outlook.com > > wrote: > >> No, how do you do that? >> >> >> Sent from Outlook <http://aka.ms/weboutlook> >> ------------------------------ >> *From:* Derek Kozel <derek.ko...@ettus.com> >> *Sent:* 08 March 2018 20:58:38 >> *To:* Andrew Thommesen >> *Cc:* usrp-users >> *Subject:* Re: [USRP-users] TwinRx Channel Alignment >> >> Hello Andrew, >> >> Are you starting the streaming with timed commands? >> >> Regards, >> Derek >> >> On Mar 8, 2018 7:32 PM, "Andrew Thommesen via USRP-users" < >> usrp-users@lists.ettus.com> wrote: >> >> Hi all, >> >> >> I have an x310 with a twinRx and would like to process coherent, >> time aligned data within the FPGA. However, the data is not currently time >> aligned and there is an offset of ~400 samples between the two channels. >> >> >> The RFNoC radio block is configured to receive data on both channels, >> with the LO of channel 1 set to companion. The output of the radio block >> then passes through the RFNoC DDC block that decimates from 100MSPS to >> 50MSPS. The decimated data then passes to a custom RFNoC block that strips >> out the timestamps (for loopback). It is within this custom block that the >> the offset is detected at the output of the AXI wrapper before any >> processing has taken place. >> >> >> Any ideas? >> >> >> Andy >> >> >> >> >> Sent from Outlook <http://aka.ms/weboutlook> >> >> _______________________________________________ >> 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 > >
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