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//
// Copyright 2010-2011,2014 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/thread/thread.hpp>
#include <boost/format.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/algorithm/string.hpp>
#include <csignal>
#include <iostream>
#include <complex>
namespace po = boost::program_options;
static bool stop_signal_called = false;
void sig_int_handler(int){stop_signal_called = true;}
int UHD_SAFE_MAIN(int argc, char *argv[]){
uhd::set_thread_priority_safe();
//variables to be set by po
std::string args, channel_list;
double seconds_in_future;
size_t total_num_samps;
double rate;
float ampl;
double freq;
double rep_rate;
double gain;
//setup the program options
po::options_description desc("Allowed options");
desc.add_options()
("help", "help message")
("args", po::value<std::string>(&args)->default_value(""), "multi uhd device address args")
("secs", po::value<double>(&seconds_in_future)->default_value(1.5), "delay before first burst")
("repeat", "repeat burst")
("rep-delay", po::value<double>(&rep_rate)->default_value(0.5), "delay between bursts")
("nsamps", po::value<size_t>(&total_num_samps)->default_value(10000), "total number of samples to transmit")
("rate", po::value<double>(&rate)->default_value(100e6/16), "rate of outgoing samples")
("ampl", po::value<float>(&l)->default_value(float(0.3)), "amplitude of each sample")
("freq", po::value<double>(&freq)->default_value(0), "center frequency")
("gain", po::value<double>(&gain)->default_value(0), "gain")
("dilv", "specify to disable inner-loop verbose")
("channels", po::value<std::string>(&channel_list)->default_value("0"), "which channel(s) to use (specify \"0\", \"1\", \"0,1\", etc")
("int-n", "tune USRP with integer-n tuning")
;
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 TX Timed Samples %s") % desc << std::endl;
return ~0;
}
bool verbose = vm.count("dilv") == 0;
bool repeat = vm.count("repeat") != 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);
std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl;
//detect which channels to use
std::vector<std::string> channel_strings;
std::vector<size_t> channel_nums;
boost::split(channel_strings, channel_list, boost::is_any_of("\"',"));
for(size_t ch = 0; ch < channel_strings.size(); ch++){
size_t chan = boost::lexical_cast<int>(channel_strings[ch]);
if(chan >= usrp->get_tx_num_channels()){
throw std::runtime_error("Invalid channel(s) specified.");
}
else channel_nums.push_back(boost::lexical_cast<int>(channel_strings[ch]));
}
//set the tx sample rate
std::cout << boost::format("Setting TX Rate: %f Msps...") % (rate/1e6) << std::endl;
usrp->set_tx_rate(rate);
std::cout << boost::format("Actual TX Rate: %f Msps...") % (usrp->get_tx_rate()/1e6) << std::endl << std::endl;
std::cout << boost::format("Setting TX Freq: %f MHz...") % (freq/1e6) << std::endl;
for(size_t i=0; i < channel_nums.size(); i++){
uhd::tune_request_t tune_request(freq);
if(vm.count("int-n")) tune_request.args = uhd::device_addr_t("mode_n=int-n");
usrp->set_tx_freq(tune_request, channel_nums[i]);
}
std::cout << boost::format("Actual TX Freq: %f MHz...") % (usrp->get_tx_freq()/1e6) << std::endl << std::endl;
std::cout << boost::format("Setting TX Gain: %f...") % (gain) << std::endl;
for(size_t i=0; i < channel_nums.size(); i++) usrp->set_tx_gain(gain, channel_nums[i]);
std::cout << boost::format("Actual TX Gain: %f...") % (usrp->get_tx_gain()) << std::endl << std::endl;
std::cout << boost::format("Setting device timestamp to 0...") << std::endl;
usrp->set_time_now(uhd::time_spec_t(0.0));
//create a transmit streamer
uhd::stream_args_t stream_args("fc32"); //complex floats
stream_args.channels = channel_nums;
uhd::tx_streamer::sptr tx_stream = usrp->get_tx_stream(stream_args);
//allocate buffer with data to send
const size_t spb = tx_stream->get_max_num_samps();
std::vector<std::complex<float> > buff(spb, std::complex<float>(ampl, ampl));
std::vector<std::complex<float> *> buffs(channel_nums.size(), &buff.front());
std::signal(SIGINT, &sig_int_handler);
if(repeat) std::cout << "Press Ctrl + C to quit..." << std::endl;
double time_to_send = seconds_in_future;
do {
//setup metadata for the first packet
uhd::tx_metadata_t md;
md.start_of_burst = true;
md.end_of_burst = false;
md.has_time_spec = true;
md.time_spec = uhd::time_spec_t(time_to_send);
//the first call to send() will block this many seconds before sending:
double timeout = std::max(rep_rate, seconds_in_future) + 0.1; //timeout (delay before transmit + padding)
size_t num_acc_samps = 0; //number of accumulated samples
while(num_acc_samps < total_num_samps){
size_t samps_to_send = std::min(total_num_samps - num_acc_samps, spb);
//send a single packet
size_t num_tx_samps = tx_stream->send(
buffs, samps_to_send, md, timeout
);
//do not use time spec for subsequent packets
md.has_time_spec = false;
md.start_of_burst = false;
if (num_tx_samps < samps_to_send) std::cerr << "Send timeout..." << std::endl;
if(verbose) std::cout << boost::format("Sent packet: %u samples") % num_tx_samps << std::endl;
num_acc_samps += num_tx_samps;
}
md.end_of_burst = true;
tx_stream->send(buffs, 0, md, timeout);
time_to_send += rep_rate;
std::cout << std::endl << "Waiting for async burst ACK... " << std::flush;
uhd::async_metadata_t async_md;
bool got_async_burst_ack = false;
//loop through all messages for the ACK packet (may have underflow messages in queue)
while (not got_async_burst_ack and tx_stream->recv_async_msg(async_md, seconds_in_future)){
got_async_burst_ack = (async_md.event_code == uhd::async_metadata_t::EVENT_CODE_BURST_ACK);
}
std::cout << (got_async_burst_ack? "success" : "fail") << std::endl;
} while (not stop_signal_called and repeat);
//finished
std::cout << std::endl << "Done!" << std::endl << std::endl;
return EXIT_SUCCESS;
}
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