On 03/16/2018 11:49 AM, Reinhold Frederick William Hollender via USRP-users wrote: > I just wanted to share my experience getting two Rx streams at different > rates working with the B210 in case someone else tries to do the same > thing in the future. > > The only other resource I found on this > (http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2015-April/041655.html) > seemed to have conflicting information, and no real resolution. > > I also didn't see anything like this described in the knowledge base, > although perhaps I was looking in the wrong place :) > > Following some breadcrumbs in the UHD source, I was able to get the > attached sample to work reliably. > > The important points: > -> There's no need to have multiple 'multi_usrp' objects because > device.make() will return the same object if it's already setup anyway > -> Both streams need to be read in the same thread (there were comments > that hinted at this in recv_packet_demuxer_3000) > -> The streams need to be kept in sync by keeping the number of sample > read by each stream the same ratio as the sample rates (otherwise one > stream will get behind and the other will overflow).
William, thanks for pointing this out! You might want to add that the rates need to be integer multiples of each other, or the FPGA can't handle the resampling. -- M _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
