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//
// Copyright 2010-2011 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/single_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[]){
uhd::set_thread_priority_safe();
//variables to be set by po
std::string args;
double wait_time;
size_t total_num_samps;
size_t samps_per_packet;
double rate, freq;
float ampl;
//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>(&wait_time)->default_value(0.1), "number of seconds in the future to transmit")
("nsamps", po::value<size_t>(&total_num_samps)->default_value(100), "total number of samples to transmit")
("spp", po::value<size_t>(&samps_per_packet)->default_value(1000), "number of samples per packet")
("rate", po::value<double>(&rate)->default_value(100e6/4), "rate of outgoing samples")
("freq", po::value<double>(&freq)->default_value(0), "rf center frequency in Hz")
("ampl", po::value<float>(&l)->default_value(float(0.3)), "amplitude of each sample")
("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("Latency Test %s") % desc << 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::single_usrp::sptr sdev = uhd::usrp::single_usrp::make(args);
uhd::device::sptr dev = sdev->get_device();
//std::cout << boost::format("Using Device: %s") % sdev->get_pp_string() << std::endl;
//set the tx sample rate
sdev->set_tx_rate(rate);
std::cout << boost::format("Actual TX Rate: %f Msps...") % (sdev->get_tx_rate()/1e6) << std::endl;
//set the rx sample rate
sdev->set_rx_rate(rate);
std::cout << boost::format("Actual RX Rate: %f Msps...") % (sdev->get_rx_rate()/1e6) << std::endl;
//allocate data to send
std::vector<std::complex<float> > txbuff(samps_per_packet, std::complex<float>(ampl, ampl));
//allocate receive buffer
std::vector<std::complex<float> > rxbuff(samps_per_packet, std::complex<float>(ampl, ampl));
int time_error = 0;
int ack = 0;
int underflow = 0;
int other = 0;
// **************************************************
if(verbose)
std::cout << boost::format("Setting device timestamp to 0...") << std::endl;
sdev->set_time_now(uhd::time_spec_t(0.0));
//setup streaming
std::cout << std::endl;
if(verbose)
std::cout << boost::format(
"Begin receiving %u samples, %f seconds in the future..."
) % total_num_samps % wait_time << 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;
double delta_t = 0.0001;
uhd::tx_metadata_t tx_md;
size_t num_packets = (total_num_samps+samps_per_packet-1)/samps_per_packet;
double cur_time = 0.0;
sdev->set_time_now(uhd::time_spec_t(cur_time));
for(int j=0;j<100;j++) {
cur_time += wait_time;
stream_cmd.time_spec = uhd::time_spec_t(cur_time);
sdev->issue_stream_cmd(stream_cmd);
size_t num_acc_samps = 0;
uhd::rx_metadata_t rx_md;
while(num_acc_samps < total_num_samps){
std::vector<std::complex<float> > rxbuff(dev->get_max_recv_samps_per_packet());
size_t num_rx_samps = dev->recv(
&rxbuff.front(), rxbuff.size(), rx_md,
uhd::io_type_t::COMPLEX_FLOAT32,
uhd::device::RECV_MODE_ONE_PACKET
);
switch(rx_md.error_code){
case uhd::rx_metadata_t::ERROR_CODE_NONE:
break;
case uhd::rx_metadata_t::ERROR_CODE_TIMEOUT:
if (num_acc_samps == 0) continue;
std::cout << boost::format
("Got timeout before all samples received, possible packet loss, exiting loop...") << std::endl;
goto done_loop;
default:
std::cout << boost::format("Got error code 0x%x, exiting loop...") % rx_md.error_code << std::endl;
goto done_loop;
}
if(verbose) std::cout << boost::format("Got packet: %u samples, %u full secs, %f frac secs")
% num_rx_samps % rx_md.time_spec.get_full_secs() % rx_md.time_spec.get_frac_secs() << std::endl;
num_acc_samps += num_rx_samps;
} done_loop:
if(verbose) std::cout << "Done receiving samps" << std::endl;
for (size_t i = 0; i < num_packets; i++){
//setup the metadata flags per fragment
tx_md.start_of_burst = (i == 0); //only first packet has SOB
tx_md.end_of_burst = (i == num_packets-1); //only last packet has EOB
tx_md.has_time_spec = (i == 0); //only first packet has time
size_t samps_to_send = std::min(total_num_samps - samps_per_packet*i, samps_per_packet);
//send the entire packet (driver fragments internally)
tx_md.time_spec = uhd::time_spec_t(cur_time+delta_t);
size_t num_tx_samps = dev->send
(&txbuff.front(), samps_to_send, tx_md,
uhd::io_type_t::COMPLEX_FLOAT32,
uhd::device::SEND_MODE_FULL_BUFF,
//send will backup into the host this many seconds before sending:
cur_time + delta_t + 0.1 //timeout (delay before transmit + padding)
);
if (num_tx_samps < samps_to_send) std::cout << "Send timeout..." << std::endl;
if(verbose)
std::cout << std::endl << boost::format("Sent %d samples") % num_tx_samps << std::endl;
}
uhd::async_metadata_t async_md;
if (not dev->recv_async_msg(async_md)){
std::cout << boost::format
("failed:\n Async message recv timed out.\n") << std::endl;
} else {
switch(async_md.event_code){
case uhd::async_metadata_t::EVENT_CODE_TIME_ERROR :
time_error++;
break;
case uhd::async_metadata_t::EVENT_CODE_BURST_ACK :
ack++;
break;
case uhd::async_metadata_t::EVENT_CODE_UNDERFLOW :
underflow++;
break;
default:
std::cout << boost::format
("failed:\n Got unexpected event code 0x%x.\n")
% async_md.event_code << std::endl;
other++;
break;
}
}
}
std::cout << boost::format("ACK %d, UNDERFLOW %d, TIME_ERR %d, other %d") % ack
% underflow % time_error % other << std::endl;
}
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