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//
// Copyright 2011 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/utils/thread_priority.hpp>
#include <uhd/utils/safe_main.hpp>
#include <uhd/usrp/multi_usrp.hpp>
#include <boost/program_options.hpp>
#include <boost/format.hpp>
#include <boost/thread.hpp>
#include <iostream>
#include <complex>
namespace po = boost::program_options;
int UHD_SAFE_MAIN(int argc, char *argv[]){
uhd::set_thread_priority_safe();
//variables to be set by po
std::string args, sync, subdev;
double seconds_in_future;
size_t total_num_samps;
double rate;
//setup the program options
po::options_description desc("Allowed options");
desc.add_options()
("help", "help message")
("args", po::value<std::string>(&args)->default_value(""), "single uhd device address args")
("secs", po::value<double>(&seconds_in_future)->default_value(1.5), "number of seconds in the future to receive")
("nsamps", po::value<size_t>(&total_num_samps)->default_value(10000), "total number of samples to receive")
("rate", po::value<double>(&rate)->default_value(100e6/16), "rate of incoming samples")
("sync", po::value<std::string>(&sync)->default_value("now"), "synchronization method: now, pps, mimo")
("subdev", po::value<std::string>(&subdev), "subdev spec (homogeneous across motherboards)")
("dilv", "specify to disable inner-loop verbose")
;
po::variables_map vm;
po::store(po::parse_command_line(argc, argv, desc), vm);
po::notify(vm);
//print the help message
if (vm.count("help")){
std::cout << boost::format("UHD RX Multi Samples %s") % desc << std::endl;
std::cout <<
" This is a demonstration of how to receive aligned data from multiple channels.\n"
" This example can receive from multiple DSPs, multiple motherboards, or both.\n"
" The MIMO cable or PPS can be used to synchronize the configuration. See --sync\n"
"\n"
" Specify --subdev to select multiple channels per motherboard.\n"
" Ex: --subdev=\"0:A 0:B\" to get 2 channels on a Basic RX.\n"
"\n"
" Specify --args to select multiple motherboards in a configuration.\n"
" Ex: --args=\"addr0=192.168.10.2, addr1=192.168.10.3\"\n"
<< std::endl;
return ~0;
}
bool verbose = vm.count("dilv") == 0;
//create a usrp device
std::cout << std::endl;
std::cout << boost::format("Creating the usrp device with: %s...") % args << std::endl;
uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);
//always select the subdevice first, the channel mapping affects the other settings
if (vm.count("subdev")) usrp->set_rx_subdev_spec(subdev); //sets across all mboards
std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl;
//set the rx sample rate (sets across all channels)
std::cout << boost::format("Setting RX Rate: %f Msps...") % (rate/1e6) << std::endl;
usrp->set_rx_rate(rate);
std::cout << boost::format("Actual RX Rate: %f Msps...") % (usrp->get_rx_rate()/1e6) << std::endl << std::endl;
std::cout << boost::format("Setting device timestamp to 0...") << std::endl;
if (sync == "now"){
//This is not a true time lock, the devices will be off by a few RTT.
//Rather, this is just to allow for demonstration of the code below.
usrp->set_time_now(uhd::time_spec_t(0.0));
}
else if (sync == "pps"){
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)); //wait for pps sync pulse
}
else if (sync == "mimo"){
UHD_ASSERT_THROW(usrp->get_num_mboards() == 2);
//make mboard 1 a slave over the MIMO Cable
usrp->set_clock_source("mimo", 1);
usrp->set_time_source("mimo", 1);
//set time on the master (mboard 0)
usrp->set_time_now(uhd::time_spec_t(0.0), 0);
//sleep a bit while the slave locks its time to the master
boost::this_thread::sleep(boost::posix_time::milliseconds(100));
}
//create a receive streamer
//linearly map channels (index0 = channel0, index1 = channel1, ...)
uhd::stream_args_t stream_args("fc32"); //complex floats
for (size_t chan = 0; chan < usrp->get_rx_num_channels(); chan++)
stream_args.channels.push_back(chan); //linear mapping
uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args);
//setup streaming
std::cout << std::endl;
std::cout << boost::format(
"Begin streaming %u samples, %f seconds in the future..."
) % total_num_samps % seconds_in_future << std::endl;
uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
stream_cmd.num_samps = total_num_samps;
stream_cmd.stream_now = false;
stream_cmd.time_spec = uhd::time_spec_t(seconds_in_future);
usrp->issue_stream_cmd(stream_cmd); //tells all channels to stream
//meta-data will be filled in by recv()
uhd::rx_metadata_t md;
//allocate buffers to receive with samples (one buffer per channel)
const size_t samps_per_buff = rx_stream->get_max_num_samps();
std::vector<std::vector<std::complex<float> > > buffs(
usrp->get_rx_num_channels(), std::vector<std::complex<float> >(samps_per_buff)
);
//create a vector of pointers to point to each of the channel buffers
std::vector<std::complex<float> *> buff_ptrs;
for (size_t i = 0; i < buffs.size(); i++) buff_ptrs.push_back(&buffs[i].front());
//the first call to recv() will block this many seconds before receiving
double timeout = seconds_in_future + 0.1; //timeout (delay before receive + padding)
size_t num_acc_samps = 0; //number of accumulated samples
while(num_acc_samps < total_num_samps){
//receive a single packet
size_t num_rx_samps = rx_stream->recv(
buff_ptrs, samps_per_buff, md, timeout
);
//use a small timeout for subsequent packets
timeout = 0.1;
//handle the error code
if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_TIMEOUT) break;
if (md.error_code != uhd::rx_metadata_t::ERROR_CODE_NONE){
throw std::runtime_error(str(boost::format(
"Unexpected error code 0x%x"
) % md.error_code));
}
if(verbose) std::cout << boost::format(
"Received packet: %u samples, %u full secs, %f frac secs"
) % num_rx_samps % md.time_spec.get_full_secs() % md.time_spec.get_frac_secs() << std::endl;
num_acc_samps += num_rx_samps;
}
if (num_acc_samps < total_num_samps) std::cerr << "Receive timeout before all samples received..." << std::endl;
//finished
std::cout << std::endl << "Done!" << std::endl << std::endl;
return 0;
}
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