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-rw-r--r--host/examples/latency_test.cpp245
1 files changed, 102 insertions, 143 deletions
diff --git a/host/examples/latency_test.cpp b/host/examples/latency_test.cpp
index 340e87fb7..be44aad70 100644
--- a/host/examples/latency_test.cpp
+++ b/host/examples/latency_test.cpp
@@ -1,5 +1,5 @@
//
-// Copyright 2010-2011 Ettus Research LLC
+// Copyright 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
@@ -17,7 +17,7 @@
#include <uhd/utils/thread_priority.hpp>
#include <uhd/utils/safe_main.hpp>
-#include <uhd/usrp/single_usrp.hpp>
+#include <uhd/usrp/multi_usrp.hpp>
#include <boost/program_options.hpp>
#include <boost/format.hpp>
#include <iostream>
@@ -30,28 +30,21 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
//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;
- double delta_t;
- size_t pkts;
+ size_t nsamps;
+ double rate;
+ double rtt;
+ size_t nruns;
//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")
- ("wait", po::value<double>(&wait_time)->default_value(0.1), "wait time between test cycles")
- ("rtt", po::value<double>(&delta_t)->default_value(0.001), "Round-Trip time to test")
- ("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")
- ("pkts", po::value<size_t>(&pkts)->default_value(1000), "number of packets")
- ("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>(&ampl)->default_value(float(0.3)), "amplitude of each sample")
- ("dilv", "specify to disable inner-loop verbose")
+ ("args", po::value<std::string>(&args)->default_value(""), "single uhd device address args")
+ ("nsamps", po::value<size_t>(&nsamps)->default_value(100), "number of samples per run")
+ ("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)")
+ ("verbose", "specify to enable inner-loop verbose")
;
po::variables_map vm;
po::store(po::parse_command_line(argc, argv, desc), vm);
@@ -59,150 +52,116 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
//print the help message
if (vm.count("help")){
- std::cout << boost::format("Latency Test %s") % desc << std::endl;
+ std::cout << boost::format("UHD - Latency Test %s") % desc << std::endl;
+ std::cout <<
+ " Latency test receives a packet at time t,\n"
+ " and tries to send a packet at time t + rtt,\n"
+ " where rtt is the round trip time sample time\n"
+ " from device to host and back to the device.\n"
+ << std::endl;
return ~0;
}
- bool verbose = vm.count("dilv") == 0;
+ bool verbose = vm.count("verbose") != 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;
+ 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;
+
+ usrp->set_time_now(uhd::time_spec_t(0.0));
//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;
+ usrp->set_tx_rate(rate);
+ std::cout << boost::format("Actual TX Rate: %f Msps...") % (usrp->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));
+ usrp->set_rx_rate(rate);
+ std::cout << boost::format("Actual RX Rate: %f Msps...") % (usrp->get_rx_rate()/1e6) << std::endl;
+ //allocate a buffer to use
+ std::vector<std::complex<float> > buffer(nsamps);
+ //initialize result counts
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;
-
- uhd::tx_metadata_t tx_md;
-
- size_t num_packets = (total_num_samps+samps_per_packet-1)/samps_per_packet;
-
-
- uhd::time_spec_t cur_time;
- sdev->set_time_now(uhd::time_spec_t(cur_time));
-
- for(int j=0;j<pkts;j++) {
- int err = 0;
- //sleep(0.3);
- cur_time = sdev->get_time_now() + uhd::time_spec_t(0.01);
- 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;
- err = 1;
- goto done_loop;
+ for(size_t nrun = 0; nrun < nruns; nrun++){
+
+ /***************************************************************
+ * Issue a stream command some time in the near future
+ **************************************************************/
+ uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
+ stream_cmd.num_samps = buffer.size();
+ stream_cmd.stream_now = false;
+ stream_cmd.time_spec = usrp->get_time_now() + uhd::time_spec_t(0.01);
+ usrp->issue_stream_cmd(stream_cmd);
+
+ /***************************************************************
+ * Receive the requested packet
+ **************************************************************/
+ uhd::rx_metadata_t rx_md;
+ size_t num_rx_samps = usrp->get_device()->recv(
+ &buffer.front(), buffer.size(), rx_md,
+ uhd::io_type_t::COMPLEX_FLOAT32,
+ uhd::device::RECV_MODE_FULL_BUFF
+ );
+
+ 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;
+
+ /***************************************************************
+ * Transmit a packet with delta time after received packet
+ **************************************************************/
+ uhd::tx_metadata_t tx_md;
+ tx_md.start_of_burst = true;
+ 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 = usrp->get_device()->send(
+ &buffer.front(), buffer.size(), tx_md,
+ uhd::io_type_t::COMPLEX_FLOAT32,
+ uhd::device::SEND_MODE_FULL_BUFF
+ );
+ if(verbose) std::cout << boost::format("Sent %d samples") % num_tx_samps << std::endl;
+
+ /***************************************************************
+ * Check the async messages for result
+ **************************************************************/
+ uhd::async_metadata_t async_md;
+ if (not usrp->get_device()->recv_async_msg(async_md)){
+ std::cout << boost::format("failed:\n Async message recv timed out.\n") << std::endl;
+ continue;
+ }
+ 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("Got error code 0x%x, exiting loop...") % rx_md.error_code << std::endl;
- err = 1;
- goto done_loop;
+ std::cout << boost::format
+ ("failed:\n Got unexpected event code 0x%x.\n")
+ % async_md.event_code << std::endl;
+ other++;
+ break;
}
-
- 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;
- if(err)
- continue;
- 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 = rx_md.time_spec+uhd::time_spec_t(delta_t);
- tx_md.time_spec = cur_time + uhd::time_spec_t(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:
- 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;
+
+ /***************************************************************
+ * Print the summary
+ **************************************************************/
+ std::cout << boost::format("\nACK %d, UNDERFLOW %d, TIME_ERR %d, other %d")
+ % ack % underflow % time_error % other << std::endl;
return 0;
}
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