uhd

//

// Copyright 2010 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/safe_main.hpp>

#include <uhd/usrp/simple_usrp.hpp>

#include <boost/program_options.hpp>

#include <boost/format.hpp>

#include <iostream>

#include <complex>

namespace po = boost::program_options;

int UHD_SAFE_MAIN(int argc, char *argv[]){

    //variables to be set by po

    std::string transport_args;

    int seconds_in_future;

    size_t total_num_samps;

    //setup the program options

    po::options_description desc("Allowed options");

    desc.add_options()

        ("help", "help message")

        ("args", po::value<std::string>(&transport_args)->default_value(""), "simple uhd transport args")

        ("secs", po::value<int>(&seconds_in_future)->default_value(3), "number of seconds in the future to receive")

        ("nsamps", po::value<size_t>(&total_num_samps)->default_value(1000), "total number of samples to receive")

    ;

    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 Timed Samples %s") % desc << std::endl;

        return ~0;

    }

    //create a usrp device

    std::cout << std::endl;

    std::cout << boost::format("Creating the usrp device with: %s...")

        % transport_args << std::endl;

    uhd::usrp::simple_usrp::sptr sdev = uhd::usrp::simple_usrp::make(transport_args);

    uhd::device::sptr dev = sdev->get_device();

    std::cout << boost::format("Using Device: %s") % sdev->get_name() << std::endl;

    //set properties on the device

    double rx_rate = sdev->get_rx_rates()[4]; //pick some rate

    std::cout << boost::format("Setting RX Rate: %f Msps...") % (rx_rate/1e6) << std::endl;

    sdev->set_rx_rate(rx_rate);

    std::cout << boost::format("Setting device timestamp to 0...") << std::endl;

    sdev->set_time_now(uhd::time_spec_t(0));

    //setup streaming

    std::cout << std::endl;

    std::cout << boost::format("Begin streaming %u samples, %d 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);

    sdev->issue_stream_cmd(stream_cmd);

    //loop until total number of samples reached

    size_t num_acc_samps = 0; //number of accumulated samples

    while(num_acc_samps < total_num_samps){

        uhd::rx_metadata_t md;

        std::complex<float> buff[1000];

        size_t num_rx_samps = dev->recv(

            boost::asio::buffer(buff, sizeof(buff)),

            md, uhd::io_type_t::COMPLEX_FLOAT32

        );

        if (num_rx_samps == 0) continue; //wait for packets with contents

        std::cout << boost::format("Got packet: %u samples, %u secs, %u ticks")

            % num_rx_samps % md.time_spec.secs % md.time_spec.ticks << std::endl;

        num_acc_samps += num_rx_samps;

    }

    //finished

    std::cout << std::endl << "Done!" << std::endl << std::endl;

    return 0;

}