Yes I am using the command: uhd::usrp::multi_usrp::make(args) passing the IP
addresses of the three N200 boards. Moreover I check the boards synch using
usrp->get_time_synchronized () which returns true but still the sinusoids are
not temporally alligned. A colleague raised an arguement the even though the
boards' clcok are synch the daughter boards may introduce phase shift. Is this
arguement valid? I am using DB DBSRX2.
Many thanks,
Zo
PS. Thanks for recommending GRC but I am more confortable to work under windows
with MSVC.
Date: Mon, 6 May 2013 04:59:09 -0700
From: ml-node+s4n41189...@n7.nabble.com
To: xtmpcvs...@hotmail.com
Subject: Re: Example: rx_samples_to_file.py
Dear Marcus,
I a working under windows now. I have modified the the example
"rx_samples_to_file.cpp" by including the following lines
usrp->set_time_source("external");
usrp->set_time_unknown_pps(uhd::time_spec_t(0.0));
boost::this_thread::sleep(boost::posix_time::seconds(1));
for (size_t chan = 0; chan < usrp->get_rx_num_channels();
chan++)
stream_args.channels.push_back(chan);
uhd::rx_streamer::sptr rx_stream =
usrp->get_rx_stream(stream_args);
std::vector<std::vector<std::complex<float> >
> buffs( usrp->get_rx_num_channels(),
std::vector<std::complex<float> >(samps_per_buff)
);
std::vector<std::complex<float> *> buff_ptrs;
for (size_t i = 0; i < buffs.size(); i++)
buff_ptrs.push_back(&buffs[i].front());
while(not stop_signal_called and (num_requested_samples !=
num_total_samps or num_requested_samples == 0)){
size_t num_rx_samps = rx_stream->recv(buff_ptrs,
samps_per_buff, md, 2.0);
outfile1.write((const char*)buff_ptrs[0],
num_rx_samps*sizeof(float));
outfile2.write((const char*)buff_ptrs[1],
num_rx_samps*sizeof(float));
outfile3.write((const char*)buff_ptrs[2],
num_rx_samps*sizeof(float));
}
outfile1.close();
outfile2.close();
outfile3.close();
I am feeding a split sinusoid to these boards so I expected to
see similar values in these three files. However, i only see a
sinusoid in the first file and some random noise in the 2nd and
3rd files. I am not sure how the metadata saves from the three
boards. Would you check the lines above and reply if you have
any insights, please?
I wasn't able to verify sync.
Best regards,
Zo
Where are you actually doing the setup on the 3 N210s? Via a
mult-usrp object?
Seriously, you can do this in GRC in about five minutes.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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