Created example for simultaneous transmit and receive to file

    Updates to allow rx to wait until tx settles

1 files changed, 447 insertions, 0 deletions

diff --git a/host/examples/txrx_loopback_to_file.cpp b/host/examples/txrx_loopback_to_file.cpp
new file mode 100644
index 000000000..495c9f7e4
--- /dev/null
+++ b/host/examples/txrx_loopback_to_file.cpp
@@ -0,0 +1,447 @@
+//
+// Copyright 2010-2012 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/utils/static.hpp>
+#include <uhd/usrp/multi_usrp.hpp>
+#include <uhd/exception.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/program_options.hpp>
+#include <boost/math/special_functions/round.hpp>
+#include <boost/foreach.hpp>
+#include <boost/format.hpp>
+#include <iostream>
+#include <fstream>
+#include <complex>
+#include <csignal>
+#include <cmath>
+
+namespace po = boost::program_options;
+
+/***********************************************************************
+ * Signal handlers
+ **********************************************************************/
+static bool stop_signal_called = false;
+void sig_int_handler(int){stop_signal_called = true;}
+
+/***********************************************************************
+ * Waveform generators
+ **********************************************************************/
+static const size_t wave_table_len = 8192;
+
+class wave_table_class{
+public:
+    wave_table_class(const std::string &wave_type, const float ampl):
+        _wave_table(wave_table_len)
+    {
+        //compute real wave table with 1.0 amplitude
+        std::vector<double> real_wave_table(wave_table_len);
+        if (wave_type == "CONST"){
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = 1.0;
+        }
+        else if (wave_type == "SQUARE"){
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = (i < wave_table_len/2)? 0.0 : 1.0;
+        }
+        else if (wave_type == "RAMP"){
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = 2.0*i/(wave_table_len-1) - 1.0;
+        }
+        else if (wave_type == "SINE"){
+            static const double tau = 2*std::acos(-1.0);
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = std::sin((tau*i)/wave_table_len);
+        }
+        else throw std::runtime_error("unknown waveform type: " + wave_type);
+
+        //compute i and q pairs with 90% offset and scale to amplitude
+        for (size_t i = 0; i < wave_table_len; i++){
+            const size_t q = (i+(3*wave_table_len)/4)%wave_table_len;
+            _wave_table[i] = std::complex<float>(ampl*real_wave_table[i], ampl*real_wave_table[q]);
+        }
+    }
+
+    inline std::complex<float> operator()(const size_t index) const{
+        return _wave_table[index % wave_table_len];
+    }
+
+private:
+    std::vector<std::complex<float> > _wave_table;
+};
+
+/***********************************************************************
+ * transmit_worker function
+ * A function to be used as a boost::thread_group thread for transmitting
+ **********************************************************************/
+void transmit_worker(
+    std::vector<std::complex<float> > buff,
+    wave_table_class wave_table,
+    uhd::tx_streamer::sptr tx_streamer,
+    uhd::tx_metadata_t metadata,
+    size_t step,
+    size_t index,
+    int num_channels
+){
+    std::vector<std::complex<float> *> buffs(num_channels, &buff.front());
+
+    //send data until the signal handler gets called
+    while(not stop_signal_called){
+        //fill the buffer with the waveform
+        for (size_t n = 0; n < buff.size(); n++){
+            buff[n] = wave_table(index += step);
+        }
+
+        //send the entire contents of the buffer
+        tx_streamer->send(buffs, buff.size(), metadata);
+
+        metadata.start_of_burst = false;
+        metadata.has_time_spec = false;
+    }
+
+    //send a mini EOB packet
+    metadata.end_of_burst = true;
+    tx_streamer->send("", 0, metadata);
+}
+
+
+/***********************************************************************
+ * recv_to_file function
+ **********************************************************************/
+template<typename samp_type> void recv_to_file(
+    uhd::usrp::multi_usrp::sptr usrp,
+    const std::string &cpu_format,
+    const std::string &wire_format,
+    const std::string &file,
+    size_t samps_per_buff,
+    int num_requested_samples,
+    float settling_time
+){
+    int num_total_samps = 0;
+    //create a receive streamer
+    uhd::stream_args_t stream_args(cpu_format,wire_format);
+    uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args);
+
+    uhd::rx_metadata_t md;
+    std::vector<samp_type> buff(samps_per_buff);
+    std::ofstream outfile(file.c_str(), std::ofstream::binary);
+    bool overflow_message = true;
+    float timeout = settling_time + 0.1; //expected settling time + padding for first recv
+
+    //setup streaming
+    uhd::stream_cmd_t stream_cmd((num_requested_samples == 0)?
+        uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS:
+        uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE
+    );
+    stream_cmd.num_samps = num_requested_samples;
+    stream_cmd.stream_now = false;
+    stream_cmd.time_spec = uhd::time_spec_t(settling_time);
+    usrp->issue_stream_cmd(stream_cmd);
+
+    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.front(), buff.size(), md, timeout);
+        timeout = 0.1; //small timeout for subsequent recv
+
+        if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_TIMEOUT) {
+            std::cout << boost::format("Timeout while streaming") << std::endl;
+            break;
+        }
+        if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_OVERFLOW){
+            if (overflow_message){
+                overflow_message = false;
+                std::cerr << boost::format(
+                    "Got an overflow indication. Please consider the following:\n"
+                    "  Your write medium must sustain a rate of %fMB/s.\n"
+                    "  Dropped samples will not be written to the file.\n"
+                    "  Please modify this example for your purposes.\n"
+                    "  This message will not appear again.\n"
+                ) % (usrp->get_rx_rate()*sizeof(samp_type)/1e6);
+            }
+            continue;
+        }
+        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));
+        }
+
+        num_total_samps += num_rx_samps;
+
+        outfile.write((const char*)&buff.front(), num_rx_samps*sizeof(samp_type));
+    }
+
+    outfile.close();
+}
+
+
+/***********************************************************************
+ * Main function
+ **********************************************************************/
+int UHD_SAFE_MAIN(int argc, char *argv[]){
+    uhd::set_thread_priority_safe();
+
+    //transmit variables to be set by po
+    std::string tx_args, wave_type, tx_ant, tx_subdev, ref, otw;
+    double tx_rate, tx_freq, tx_gain, wave_freq, tx_bw;
+    float ampl;
+
+    //receive variables to be set by po
+    std::string rx_args, file, type, rx_ant, rx_subdev;
+    size_t total_num_samps, spb;
+    double rx_rate, rx_freq, rx_gain, rx_bw;
+    float settling;
+
+    //setup the program options
+    po::options_description desc("Allowed options");
+    desc.add_options()
+        ("help", "help message")
+        ("tx-args", po::value<std::string>(&tx_args)->default_value(""), "uhd transmit device address args")
+        ("rx-args", po::value<std::string>(&rx_args)->default_value(""), "uhd receive device address args")
+        ("file", po::value<std::string>(&file)->default_value("usrp_samples.dat"), "name of the file to write binary samples to")
+        ("type", po::value<std::string>(&type)->default_value("short"), "sample type in file: double, float, or short")
+        ("nsamps", po::value<size_t>(&total_num_samps)->default_value(0), "total number of samples to receive")
+        ("settling", po::value<float>(&settling)->default_value(float(0.2)), "settling time (seconds) before receiving")
+        ("spb", po::value<size_t>(&spb)->default_value(0), "samples per buffer, 0 for default")
+        ("tx-rate", po::value<double>(&tx_rate), "rate of transmit outgoing samples")
+        ("rx-rate", po::value<double>(&rx_rate), "rate of receive incoming samples")
+        ("tx-freq", po::value<double>(&tx_freq), "transmit RF center frequency in Hz")
+        ("rx-freq", po::value<double>(&rx_freq), "receive RF center frequency in Hz")
+        ("ampl", po::value<float>(&ampl)->default_value(float(0.3)), "amplitude of the waveform [0 to 0.7]")
+        ("tx-gain", po::value<double>(&tx_gain), "gain for the transmit RF chain")
+        ("rx-gain", po::value<double>(&rx_gain), "gain for the receive RF chain")
+        ("tx-ant", po::value<std::string>(&tx_ant), "daughterboard transmit antenna selection")
+        ("rx-ant", po::value<std::string>(&rx_ant), "daughterboard receive antenna selection")
+        ("tx-subdev", po::value<std::string>(&tx_subdev), "daughterboard transmit subdevice specification")
+        ("rx-subdev", po::value<std::string>(&rx_subdev), "daughterboard receive subdevice specification")
+        ("tx-bw", po::value<double>(&tx_bw), "daughterboard transmit IF filter bandwidth in Hz")
+        ("rx-bw", po::value<double>(&rx_bw), "daughterboard receive IF filter bandwidth in Hz")
+        ("wave-type", po::value<std::string>(&wave_type)->default_value("CONST"), "waveform type (CONST, SQUARE, RAMP, SINE)")
+        ("wave-freq", po::value<double>(&wave_freq)->default_value(0), "waveform frequency in Hz")
+        ("ref", po::value<std::string>(&ref)->default_value("internal"), "clock reference (internal, external, mimo)")
+        ("otw", po::value<std::string>(&otw)->default_value("sc16"), "specify the over-the-wire sample mode")
+    ;
+    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 TXRX Loopback to File %s") % desc << std::endl;
+        return ~0;
+    }
+
+    //create a usrp device
+    std::cout << std::endl;
+    std::cout << boost::format("Creating the transmit usrp device with: %s...") % tx_args << std::endl;
+    uhd::usrp::multi_usrp::sptr tx_usrp = uhd::usrp::multi_usrp::make(tx_args);
+    std::cout << std::endl;
+    std::cout << boost::format("Creating the receive usrp device with: %s...") % rx_args << std::endl;
+    uhd::usrp::multi_usrp::sptr rx_usrp = uhd::usrp::multi_usrp::make(rx_args);
+
+    //Lock mboard clocks
+    tx_usrp->set_clock_source(ref);
+    rx_usrp->set_clock_source(ref);
+
+    //always select the subdevice first, the channel mapping affects the other settings
+    if (vm.count("tx-subdev")) tx_usrp->set_tx_subdev_spec(tx_subdev);
+    if (vm.count("rx-subdev")) rx_usrp->set_rx_subdev_spec(rx_subdev);
+
+    std::cout << boost::format("Using Device: %s") % tx_usrp->get_pp_string() << std::endl;
+    std::cout << boost::format("Using Device: %s") % rx_usrp->get_pp_string() << std::endl;
+
+    //set the transmit sample rate
+    if (not vm.count("tx-rate")){
+        std::cerr << "Please specify the transmit sample rate with --tx-rate" << std::endl;
+        return ~0;
+    }
+    std::cout << boost::format("Setting TX Rate: %f Msps...") % (tx_rate/1e6) << std::endl;
+    tx_usrp->set_tx_rate(tx_rate);
+    std::cout << boost::format("Actual TX Rate: %f Msps...") % (tx_usrp->get_tx_rate()/1e6) << std::endl << std::endl;
+
+    //set the receive sample rate
+    if (not vm.count("rx-rate")){
+        std::cerr << "Please specify the sample rate with --rx-rate" << std::endl;
+        return ~0;
+    }
+    std::cout << boost::format("Setting RX Rate: %f Msps...") % (rx_rate/1e6) << std::endl;
+    rx_usrp->set_rx_rate(rx_rate);
+    std::cout << boost::format("Actual RX Rate: %f Msps...") % (rx_usrp->get_rx_rate()/1e6) << std::endl << std::endl;
+
+    //set the transmit center frequency
+    if (not vm.count("tx-freq")){
+        std::cerr << "Please specify the transmit center frequency with --tx-freq" << std::endl;
+        return ~0;
+    }
+
+    for(size_t chan = 0; chan < tx_usrp->get_tx_num_channels(); chan++) {
+        std::cout << boost::format("Setting TX Freq: %f MHz...") % (tx_freq/1e6) << std::endl;
+        tx_usrp->set_tx_freq(tx_freq, chan);
+        std::cout << boost::format("Actual TX Freq: %f MHz...") % (tx_usrp->get_tx_freq(chan)/1e6) << std::endl << std::endl;
+
+        //set the rf gain
+        if (vm.count("tx-gain")){
+            std::cout << boost::format("Setting TX Gain: %f dB...") % tx_gain << std::endl;
+            tx_usrp->set_tx_gain(tx_gain, chan);
+            std::cout << boost::format("Actual TX Gain: %f dB...") % tx_usrp->get_tx_gain(chan) << std::endl << std::endl;
+        }
+
+        //set the IF filter bandwidth
+        if (vm.count("tx-bw")){
+            std::cout << boost::format("Setting TX Bandwidth: %f MHz...") % tx_bw << std::endl;
+            tx_usrp->set_tx_bandwidth(tx_bw, chan);
+            std::cout << boost::format("Actual TX Bandwidth: %f MHz...") % tx_usrp->get_tx_bandwidth(chan) << std::endl << std::endl;
+        }
+
+        //set the antenna
+        if (vm.count("tx-ant")) tx_usrp->set_tx_antenna(tx_ant, chan);
+    }
+
+    //set the receive center frequency
+    if (not vm.count("rx-freq")){
+        std::cerr << "Please specify the center frequency with --rx-freq" << std::endl;
+        return ~0;
+    }
+    std::cout << boost::format("Setting RX Freq: %f MHz...") % (rx_freq/1e6) << std::endl;
+    rx_usrp->set_rx_freq(rx_freq);
+    std::cout << boost::format("Actual RX Freq: %f MHz...") % (rx_usrp->get_rx_freq()/1e6) << std::endl << std::endl;
+
+    //set the receive rf gain
+    if (vm.count("rx_gain")){
+        std::cout << boost::format("Setting RX Gain: %f dB...") % rx_gain << std::endl;
+        rx_usrp->set_rx_gain(rx_gain);
+        std::cout << boost::format("Actual RX Gain: %f dB...") % rx_usrp->get_rx_gain() << std::endl << std::endl;
+    }
+
+    //set the receive IF filter bandwidth
+    if (vm.count("rx_bw")){
+        std::cout << boost::format("Setting RX Bandwidth: %f MHz...") % rx_bw << std::endl;
+        rx_usrp->set_rx_bandwidth(rx_bw);
+        std::cout << boost::format("Actual RX Bandwidth: %f MHz...") % rx_usrp->get_rx_bandwidth() << std::endl << std::endl;
+    }
+
+    //set the receive antenna
+    if (vm.count("ant")) rx_usrp->set_rx_antenna(rx_ant);
+
+    //for the const wave, set the wave freq for small samples per period
+    if (wave_freq == 0 and wave_type == "CONST"){
+        wave_freq = tx_usrp->get_tx_rate()/2;
+    }
+
+    //error when the waveform is not possible to generate
+    if (std::abs(wave_freq) > tx_usrp->get_tx_rate()/2){
+        throw std::runtime_error("wave freq out of Nyquist zone");
+    }
+    if (tx_usrp->get_tx_rate()/std::abs(wave_freq) > wave_table_len/2){
+        throw std::runtime_error("wave freq too small for table");
+    }
+
+    //pre-compute the waveform values
+    const wave_table_class wave_table(wave_type, ampl);
+    const size_t step = boost::math::iround(wave_freq/tx_usrp->get_tx_rate() * wave_table_len);
+    size_t index = 0;
+
+    //create a transmit streamer
+    //linearly map channels (index0 = channel0, index1 = channel1, ...)
+    uhd::stream_args_t stream_args("fc32", otw);
+    for (size_t chan = 0; chan < tx_usrp->get_tx_num_channels(); chan++)
+        stream_args.channels.push_back(chan); //linear mapping
+    uhd::tx_streamer::sptr tx_stream = tx_usrp->get_tx_stream(stream_args);
+
+    //allocate a buffer which we re-use for each channel
+    if (spb == 0) spb = tx_stream->get_max_num_samps()*10;
+    std::vector<std::complex<float> > buff(spb);
+    int num_channels = tx_usrp->get_tx_num_channels();
+
+    //setup the metadata flags
+    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(0.1); //give us 0.1 seconds to fill the tx buffers
+
+    //Check Ref and LO Lock detect
+    std::vector<std::string> tx_sensor_names, rx_sensor_names;
+    tx_sensor_names = tx_usrp->get_tx_sensor_names(0);
+    if (std::find(tx_sensor_names.begin(), tx_sensor_names.end(), "lo_locked") != tx_sensor_names.end()) {
+        uhd::sensor_value_t lo_locked = tx_usrp->get_tx_sensor("lo_locked",0);
+        std::cout << boost::format("Checking TX: %s ...") % lo_locked.to_pp_string() << std::endl;
+        UHD_ASSERT_THROW(lo_locked.to_bool());
+    }
+    rx_sensor_names = rx_usrp->get_rx_sensor_names(0);
+    if (std::find(rx_sensor_names.begin(), rx_sensor_names.end(), "lo_locked") != rx_sensor_names.end()) {
+        uhd::sensor_value_t lo_locked = rx_usrp->get_rx_sensor("lo_locked",0);
+        std::cout << boost::format("Checking RX: %s ...") % lo_locked.to_pp_string() << std::endl;
+        UHD_ASSERT_THROW(lo_locked.to_bool());
+    }
+
+    tx_sensor_names = tx_usrp->get_mboard_sensor_names(0);
+    if ((ref == "mimo") and (std::find(tx_sensor_names.begin(), tx_sensor_names.end(), "mimo_locked") != tx_sensor_names.end())) {
+        uhd::sensor_value_t mimo_locked = tx_usrp->get_mboard_sensor("mimo_locked",0);
+        std::cout << boost::format("Checking TX: %s ...") % mimo_locked.to_pp_string() << std::endl;
+        UHD_ASSERT_THROW(mimo_locked.to_bool());
+    }
+    if ((ref == "external") and (std::find(tx_sensor_names.begin(), tx_sensor_names.end(), "ref_locked") != tx_sensor_names.end())) {
+        uhd::sensor_value_t ref_locked = tx_usrp->get_mboard_sensor("ref_locked",0);
+        std::cout << boost::format("Checking TX: %s ...") % ref_locked.to_pp_string() << std::endl;
+        UHD_ASSERT_THROW(ref_locked.to_bool());
+    }
+
+    rx_sensor_names = rx_usrp->get_mboard_sensor_names(0);
+    if ((ref == "mimo") and (std::find(rx_sensor_names.begin(), rx_sensor_names.end(), "mimo_locked") != rx_sensor_names.end())) {
+        uhd::sensor_value_t mimo_locked = rx_usrp->get_mboard_sensor("mimo_locked",0);
+        std::cout << boost::format("Checking RX: %s ...") % mimo_locked.to_pp_string() << std::endl;
+        UHD_ASSERT_THROW(mimo_locked.to_bool());
+    }
+    if ((ref == "external") and (std::find(rx_sensor_names.begin(), rx_sensor_names.end(), "ref_locked") != rx_sensor_names.end())) {
+        uhd::sensor_value_t ref_locked = rx_usrp->get_mboard_sensor("ref_locked",0);
+        std::cout << boost::format("Checking RX: %s ...") % ref_locked.to_pp_string() << std::endl;
+        UHD_ASSERT_THROW(ref_locked.to_bool());
+    }
+
+    if (total_num_samps == 0){
+        std::signal(SIGINT, &sig_int_handler);
+        std::cout << "Press Ctrl + C to stop streaming..." << std::endl;
+    }
+
+    //reset usrp time to prepare for transmit/receive
+    std::cout << boost::format("Setting device timestamp to 0...") << std::endl;
+    tx_usrp->set_time_now(uhd::time_spec_t(0.0));
+
+    //start transmit worker thread
+    boost::thread_group transmit_thread;
+    transmit_thread.create_thread(boost::bind(&transmit_worker, buff, wave_table, tx_stream, md, step, index, num_channels));
+
+    //recv to file
+    if (type == "double") recv_to_file<std::complex<double> >(rx_usrp, "fc64", otw, file, spb, total_num_samps, settling);
+    else if (type == "float") recv_to_file<std::complex<float> >(rx_usrp, "fc32", otw, file, spb, total_num_samps, settling);
+    else if (type == "short") recv_to_file<std::complex<short> >(rx_usrp, "sc16", otw, file, spb, total_num_samps, settling);
+    else {
+        //clean up transmit worker
+        stop_signal_called = true;
+        transmit_thread.join_all();
+        throw std::runtime_error("Unknown type " + type);
+    }
+
+    //clean up transmit worker
+    stop_signal_called = true;
+    transmit_thread.join_all();
+
+    //finished
+    std::cout << std::endl << "Done!" << std::endl << std::endl;
+    return 0;
+}