Got it! The problem I sent before is now solved by exeplicity defining gain,
frequncy and rate for the three cheannles as follows:
usrp->set_rx_gain(gain,std::string(),0);
usrp->set_rx_gain(gain,std::string(),1);
usrp->set_rx_gain(gain,std::string(),2);
and similar lines for freq and rate.
However, the obtained data is not time-alligned although I sync with the
unknown pps as in my prevoius code.
From: xtmpcvs...@hotmail.com
To: discuss-gnuradio@gnu.org
Subject: RE: Example: rx_samples_to_file.py
Date: Mon, 6 May 2013 09:15:41 +0000
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
Date: Mon, 15 Apr 2013 15:37:21 -0700
From: ml-node+s4n40806...@n7.nabble.com
To: xtmpcvs...@hotmail.com
Subject: Re: Example: rx_samples_to_file.py
Dear All,
My aim at the timebeing is to synchronously record some data
from 3 USRP-N200 for offline processing I wonder if the provided
example "rx_samples_to_file.py" works for multiple USRPs with
external Ref/PPS.
Does anybody have an expereince with this example and wants to
share it? I cann't find any mentioning for the PPS signal in the
source file.
Best regards,
Zo
Not all examples exercise every possible API interface.
You can reproduce most of rx_samples_to_file in a .grc script within
a few minutes that enables using of PPS inputs, etc.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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