Example #1
0
/***********************************************************************
 * RX Hammer
 **********************************************************************/
void rx_hammer(uhd::usrp::multi_usrp::sptr usrp, const std::string &rx_cpu, uhd::rx_streamer::sptr rx_stream){
    uhd::set_thread_priority_safe();

    //print pre-test summary
    std::cout << boost::format(
        "Testing receive rate %f Msps"
    ) % (usrp->get_rx_rate()/1e6) << std::endl;

    //setup variables and allocate buffer
    uhd::rx_metadata_t md;
    const size_t max_samps_per_packet = rx_stream->get_max_num_samps();
    std::vector<char> buff(max_samps_per_packet*uhd::convert::get_bytes_per_item(rx_cpu));
    std::vector<void *> buffs;
    for (size_t ch = 0; ch < rx_stream->get_num_channels(); ch++)
        buffs.push_back(&buff.front()); //same buffer for each channel
    bool had_an_overflow = false;
    uhd::time_spec_t last_time;
    const double rate = usrp->get_rx_rate();
    double timeout = 1;

    uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
    cmd.time_spec = usrp->get_time_now() + uhd::time_spec_t(0.05);
    cmd.stream_now = (buffs.size() == 1);
    srand( time(NULL) );

    while (not boost::this_thread::interruption_requested()){
        cmd.num_samps = rand() % 100000;
        rx_stream->issue_stream_cmd(cmd);
        num_rx_samps += rx_stream->recv(buffs, max_samps_per_packet, md, timeout, true);

        //handle the error codes
        switch(md.error_code){
        case uhd::rx_metadata_t::ERROR_CODE_NONE:
            if (had_an_overflow){
                had_an_overflow = false;
                num_dropped_samps += boost::math::iround((md.time_spec - last_time).get_real_secs()*rate);
            }
            break;

        case uhd::rx_metadata_t::ERROR_CODE_OVERFLOW:
            had_an_overflow = true;
            last_time = md.time_spec;
            if (!md.out_of_sequence)
                num_overflows++;
            break;

        default:
            std::cerr << "Receiver error: " << md.strerror() << std::endl;
            std::cerr << "Unexpected error on recv, continuing..." << std::endl;
            break;
        }
    }
}
Example #2
0
/*!
 * Test the broken chain message:
 *    Issue a stream command with num samps and more.
 *    We expect to get an inline broken chain message.
 */
bool test_broken_chain_message(UHD_UNUSED(uhd::usrp::multi_usrp::sptr usrp), uhd::rx_streamer::sptr rx_stream, uhd::tx_streamer::sptr){
    std::cout << "Test broken chain message... " << std::flush;

    uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_MORE);
    stream_cmd.stream_now = true;
    stream_cmd.num_samps = rx_stream->get_max_num_samps();
    rx_stream->issue_stream_cmd(stream_cmd);

    std::vector<std::complex<float> > buff(rx_stream->get_max_num_samps());
    uhd::rx_metadata_t md;

    rx_stream->recv( //once for the requested samples
        &buff.front(), buff.size(), md
    );

    rx_stream->recv( //again for the inline message
        &buff.front(), buff.size(), md
    );

    switch(md.error_code){
    case uhd::rx_metadata_t::ERROR_CODE_BROKEN_CHAIN:
        std::cout << boost::format(
            "success:\n"
            "    Got error code broken chain message.\n"
        ) << std::endl;
        return true;

    case uhd::rx_metadata_t::ERROR_CODE_TIMEOUT:
        std::cout << boost::format(
            "failed:\n"
            "    Inline message recv timed out.\n"
        ) << std::endl;
        return false;

    default:
        std::cout << boost::format(
            "failed:\n"
            "    Got unexpected error code 0x%x.\n"
        ) % md.error_code << std::endl;
        return false;
    }
}
Example #3
0
/*!
 * Test the late command message:
 *    Issue a stream command with a time that is in the past.
 *    We expect to get an inline late command message.
 */
bool test_late_command_message(uhd::usrp::multi_usrp::sptr usrp, uhd::rx_streamer::sptr rx_stream, uhd::tx_streamer::sptr){
    std::cout << "Test late command message... " << std::flush;

    usrp->set_time_now(uhd::time_spec_t(200.0)); //set time

    uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
    stream_cmd.num_samps = rx_stream->get_max_num_samps();
    stream_cmd.stream_now = false;
    stream_cmd.time_spec = uhd::time_spec_t(100.0); //time in the past
    rx_stream->issue_stream_cmd(stream_cmd);

    std::vector<std::complex<float> > buff(rx_stream->get_max_num_samps());
    uhd::rx_metadata_t md;

    const size_t nsamps = rx_stream->recv(
        &buff.front(), buff.size(), md
    );

    switch(md.error_code){
    case uhd::rx_metadata_t::ERROR_CODE_LATE_COMMAND:
        std::cout << boost::format(
            "success:\n"
            "    Got error code late command message.\n"
        ) << std::endl;
        return true;

    case uhd::rx_metadata_t::ERROR_CODE_TIMEOUT:
        std::cout << boost::format(
            "failed:\n"
            "    Inline message recv timed out.\n"
        ) << std::endl;
        return false;

    default:
        std::cout << boost::format(
            "failed:\n"
            "    Got unexpected error code 0x%x, nsamps %u.\n"
        ) % md.error_code % nsamps << std::endl;
        return false;
    }
}
Example #4
0
void recv_to_file(uhd::rx_streamer::sptr rx_stream,
    const std::string& file,
    const size_t samps_per_buff,
    const double rx_rate,
    const unsigned long long num_requested_samples,
    double time_requested       = 0.0,
    bool bw_summary             = false,
    bool stats                  = false,
    bool enable_size_map        = false,
    bool continue_on_bad_packet = false)
{
    unsigned long long num_total_samps = 0;

    uhd::rx_metadata_t md;
    std::vector<samp_type> buff(samps_per_buff);
    std::ofstream outfile;
    if (not file.empty()) {
        outfile.open(file.c_str(), std::ofstream::binary);
    }
    bool overflow_message = true;

    // 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  = size_t(num_requested_samples);
    stream_cmd.stream_now = true;
    stream_cmd.time_spec  = uhd::time_spec_t();
    std::cout << "Issuing stream cmd" << std::endl;
    rx_stream->issue_stream_cmd(stream_cmd);

    const auto start_time = std::chrono::steady_clock::now();
    const auto stop_time =
        start_time + std::chrono::milliseconds(int64_t(1000 * time_requested));
    // Track time and samps between updating the BW summary
    auto last_update                     = start_time;
    unsigned long long last_update_samps = 0;

    typedef std::map<size_t, size_t> SizeMap;
    SizeMap mapSizes;

    // Run this loop until either time expired (if a duration was given), until
    // the requested number of samples were collected (if such a number was
    // given), or until Ctrl-C was pressed.
    while (not stop_signal_called
           and (num_requested_samples != num_total_samps or num_requested_samples == 0)
           and (time_requested == 0.0 or std::chrono::steady_clock::now() <= stop_time)) {
        const auto now = std::chrono::steady_clock::now();

        size_t num_rx_samps =
            rx_stream->recv(&buff.front(), buff.size(), md, 3.0, enable_size_map);

        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")
                           % (rx_rate * sizeof(samp_type) / 1e6);
            }
            continue;
        }
        if (md.error_code != uhd::rx_metadata_t::ERROR_CODE_NONE) {
            std::string error = str(boost::format("Receiver error: %s") % md.strerror());
            if (continue_on_bad_packet) {
                std::cerr << error << std::endl;
                continue;
            } else
                throw std::runtime_error(error);
        }

        if (enable_size_map) {
            SizeMap::iterator it = mapSizes.find(num_rx_samps);
            if (it == mapSizes.end())
                mapSizes[num_rx_samps] = 0;
            mapSizes[num_rx_samps] += 1;
        }

        num_total_samps += num_rx_samps;

        if (outfile.is_open()) {
            outfile.write((const char*)&buff.front(), num_rx_samps * sizeof(samp_type));
        }

        if (bw_summary) {
            last_update_samps += num_rx_samps;
            const auto time_since_last_update = now - last_update;
            if (time_since_last_update > std::chrono::seconds(UPDATE_INTERVAL)) {
                const double time_since_last_update_s =
                    std::chrono::duration<double>(time_since_last_update).count();
                const double rate = double(last_update_samps) / time_since_last_update_s;
                std::cout << "\t" << (rate / 1e6) << " MSps" << std::endl;
                last_update_samps = 0;
                last_update       = now;
            }
        }
    }
    const auto actual_stop_time = std::chrono::steady_clock::now();

    stream_cmd.stream_mode = uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS;
    std::cout << "Issuing stop stream cmd" << std::endl;
    rx_stream->issue_stream_cmd(stream_cmd);

    // Run recv until nothing is left
    int num_post_samps = 0;
    do {
        num_post_samps = rx_stream->recv(&buff.front(), buff.size(), md, 3.0);
    } while (num_post_samps and md.error_code == uhd::rx_metadata_t::ERROR_CODE_NONE);

    if (outfile.is_open())
        outfile.close();

    if (stats) {
        std::cout << std::endl;

        const double actual_duration_seconds =
            std::chrono::duration<float>(actual_stop_time - start_time).count();

        std::cout << boost::format("Received %d samples in %f seconds") % num_total_samps
                         % actual_duration_seconds
                  << std::endl;
        const double rate = (double)num_total_samps / actual_duration_seconds;
        std::cout << (rate / 1e6) << " MSps" << std::endl;

        if (enable_size_map) {
            std::cout << std::endl;
            std::cout << "Packet size map (bytes: count)" << std::endl;
            for (SizeMap::iterator it = mapSizes.begin(); it != mapSizes.end(); it++)
                std::cout << it->first << ":\t" << it->second << std::endl;
        }
    }
}
Example #5
0
/***********************************************************************
 * Benchmark RX Rate
 **********************************************************************/
void benchmark_rx_rate(
        uhd::usrp::multi_usrp::sptr usrp,
        const std::string &rx_cpu,
        uhd::rx_streamer::sptr rx_stream,
        bool random_nsamps,
        const boost::posix_time::ptime &start_time,
        std::atomic<bool>& burst_timer_elapsed
) {
    uhd::set_thread_priority_safe();

    //print pre-test summary
    std::cout << boost::format(
        "[%s] Testing receive rate %f Msps on %u channels"
    ) % NOW() % (usrp->get_rx_rate()/1e6) % rx_stream->get_num_channels() << std::endl;

    //setup variables and allocate buffer
    uhd::rx_metadata_t md;
    const size_t max_samps_per_packet = rx_stream->get_max_num_samps();
    std::vector<char> buff(max_samps_per_packet*uhd::convert::get_bytes_per_item(rx_cpu));
    std::vector<void *> buffs;
    for (size_t ch = 0; ch < rx_stream->get_num_channels(); ch++)
        buffs.push_back(&buff.front()); //same buffer for each channel
    bool had_an_overflow = false;
    uhd::time_spec_t last_time;
    const double rate = usrp->get_rx_rate();

    uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
    cmd.time_spec = usrp->get_time_now() + uhd::time_spec_t(INIT_DELAY);
    cmd.stream_now = (buffs.size() == 1);
    rx_stream->issue_stream_cmd(cmd);

    const float burst_pkt_time =
        std::max<float>(0.100f, (2 * max_samps_per_packet/rate));
    float recv_timeout = burst_pkt_time + INIT_DELAY;

    bool stop_called = false;
    while (true) {
        //if (burst_timer_elapsed.load(boost::memory_order_relaxed) and not stop_called) {
        if (burst_timer_elapsed and not stop_called) {
            rx_stream->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
            stop_called = true;
        }
        if (random_nsamps) {
            cmd.num_samps = rand() % max_samps_per_packet;
            rx_stream->issue_stream_cmd(cmd);
        }
        try {
            num_rx_samps += rx_stream->recv(buffs, max_samps_per_packet, md, recv_timeout)*rx_stream->get_num_channels();
            recv_timeout = burst_pkt_time;
        }
        catch (uhd::io_error &e) {
            std::cerr << "[" << NOW() << "] Caught an IO exception. " << std::endl;
            std::cerr << e.what() << std::endl;
            return;
        }

        //handle the error codes
        switch(md.error_code){
        case uhd::rx_metadata_t::ERROR_CODE_NONE:
            if (had_an_overflow) {
                had_an_overflow = false;
                const long dropped_samps =
                    (md.time_spec - last_time).to_ticks(rate);
                if (dropped_samps < 0) {
                    std::cerr
                        << "[" << NOW() << "] Timestamp after overrun recovery "
                           "ahead of error timestamp! Unable to calculate "
                           "number of dropped samples."
                           "(Delta: " << dropped_samps << " ticks)\n";
                }
                num_dropped_samps += std::max<long>(1, dropped_samps);
            }
            if ((burst_timer_elapsed or stop_called) and md.end_of_burst) {
                return;
            }
            break;

        // ERROR_CODE_OVERFLOW can indicate overflow or sequence error
        case uhd::rx_metadata_t::ERROR_CODE_OVERFLOW:
            last_time = md.time_spec;
            had_an_overflow = true;
            // check out_of_sequence flag to see if it was a sequence error or overflow
            if (!md.out_of_sequence) {
                num_overruns++;
            } else {
                num_seqrx_errors++;
                std::cerr << "[" << NOW() << "] Detected Rx sequence error." << std::endl;
            }
            break;

        case uhd::rx_metadata_t::ERROR_CODE_LATE_COMMAND:
            std::cerr << "[" << NOW() << "] Receiver error: " << md.strerror() << ", restart streaming..."<< std::endl;
            num_late_commands++;
            // Radio core will be in the idle state. Issue stream command to restart streaming.
            cmd.time_spec = usrp->get_time_now() + uhd::time_spec_t(0.05);
            cmd.stream_now = (buffs.size() == 1);
            rx_stream->issue_stream_cmd(cmd);
            break;

        case uhd::rx_metadata_t::ERROR_CODE_TIMEOUT:
            if (burst_timer_elapsed) {
                return;
            }
            std::cerr << "[" << NOW() << "] Receiver error: " << md.strerror() << ", continuing..." << std::endl;
            num_timeouts_rx++;
            break;

            // Otherwise, it's an error
        default:
            std::cerr << "[" << NOW() << "] Receiver error: " << md.strerror() << std::endl;
            std::cerr << "[" << NOW() << "] Unexpected error on recv, continuing..." << std::endl;
            break;
        }
    }
}