diff options
Diffstat (limited to 'host/examples')
| -rw-r--r-- | host/examples/latency_test.cpp | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/host/examples/latency_test.cpp b/host/examples/latency_test.cpp index 798279310..69d34dbff 100644 --- a/host/examples/latency_test.cpp +++ b/host/examples/latency_test.cpp @@ -36,6 +36,7 @@ int UHD_SAFE_MAIN(int argc, char* argv[]) ("nruns", po::value<size_t>(&nruns)->default_value(1000), "number of tests to perform") ("rtt", po::value<double>(&rtt)->default_value(0.001), "delay between receive and transmit (seconds)") ("rate", po::value<double>(&rate)->default_value(100e6/4), "sample rate for receive and transmit (sps)") + ("from-eob", "specify to define rtt to not include the time to clock out the RX samples (removes dependence on nsamps and rate)") ("verbose", "specify to enable inner-loop verbose") ; // clang-format on @@ -61,7 +62,8 @@ int UHD_SAFE_MAIN(int argc, char* argv[]) return EXIT_SUCCESS; } - bool verbose = vm.count("verbose") != 0; + bool verbose = vm.count("verbose") != 0; + bool from_eob = vm.count("from-eob") != 0; // create a usrp device std::cout << std::endl; @@ -80,9 +82,17 @@ int UHD_SAFE_MAIN(int argc, char* argv[]) // set the rx sample rate usrp->set_rx_rate(rate); - std::cout << boost::format("Actual RX Rate: %f Msps...") % (usrp->get_rx_rate() / 1e6) + double actual_rx_rate = usrp->get_rx_rate(); + std::cout << boost::format("Actual RX Rate: %f Msps...") % (actual_rx_rate / 1e6) << std::endl; + double rx_time = nsamps / actual_rx_rate; + if (from_eob) { + std::cout << boost::format("Will add %f seconds to timespec for RX samples...") + % (rx_time) + << std::endl; + } + // allocate a buffer to use std::vector<std::complex<float>> buffer(nsamps); @@ -131,7 +141,10 @@ int UHD_SAFE_MAIN(int argc, char* argv[]) tx_md.end_of_burst = true; tx_md.has_time_spec = true; tx_md.time_spec = rx_md.time_spec + uhd::time_spec_t(rtt); - size_t num_tx_samps = tx_stream->send(&buffer.front(), buffer.size(), tx_md); + if (from_eob) { + tx_md.time_spec += uhd::time_spec_t(rx_time); + } + size_t num_tx_samps = tx_stream->send(&buffer.front(), buffer.size(), tx_md); if (verbose) { std::cout << boost::format("Sent %d samples") % num_tx_samps << std::endl; } |