diff options
Diffstat (limited to 'host/examples')
| -rw-r--r-- | host/examples/latency_test.cpp | 79 |
1 files changed, 71 insertions, 8 deletions
diff --git a/host/examples/latency_test.cpp b/host/examples/latency_test.cpp index 7282e70f5..eac5c1071 100644 --- a/host/examples/latency_test.cpp +++ b/host/examples/latency_test.cpp @@ -58,8 +58,14 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ " 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" + " This can be used to test latency between UHD and the device.\n" + " If the value rtt is chosen too small, the transmit packet will.\n" + " arrive too late at the device indicate an error.\n" + " The smallest value of rtt that does not indicate an error is an\n" + " approximation for the time it takes for a sample packet to\n" + " go to UHD and back to the device." << std::endl; - return ~0; + return EXIT_SUCCESS; } bool verbose = vm.count("verbose") != 0; @@ -74,11 +80,17 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ //set the tx sample rate usrp->set_tx_rate(rate); - std::cout << boost::format("Actual TX Rate: %f Msps...") % (usrp->get_tx_rate()/1e6) << std::endl; + std::cout + << boost::format("Actual TX Rate: %f Msps...") + % (usrp->get_tx_rate()/1e6) + << std::endl; //set the rx sample rate usrp->set_rx_rate(rate); - std::cout << boost::format("Actual RX Rate: %f Msps...") % (usrp->get_rx_rate()/1e6) << std::endl; + 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); @@ -113,8 +125,18 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ &buffer.front(), buffer.size(), rx_md ); - 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; + if (verbose) { + std::cout << boost::format( + "Run %d: Got packet: %u samples, %u full secs, %f frac secs" + ) + % nrun + % num_rx_samps + % rx_md.time_spec.get_full_secs() + % rx_md.time_spec.get_frac_secs() + << std::endl; + } else { + std::cout << "." << std::flush; + } /*************************************************************** * Transmit a packet with delta time after received packet @@ -127,7 +149,11 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ 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; + if (verbose) { + std::cout + << boost::format("Sent %d samples") % num_tx_samps + << std::endl; + } /*************************************************************** * Check the async messages for result @@ -159,10 +185,47 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ } } + while (true) { + uhd::async_metadata_t async_md; + if (not tx_stream->recv_async_msg(async_md)) { + break; + } + 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::cerr << boost::format( + "failed:\n Got unexpected event code 0x%x.\n" + ) % async_md.event_code << std::endl; + other++; + break; + } + } + if (!verbose) { + std::cout << 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; + std::cout << "Summary\n" + << "================\n" + << "Number of runs: " << nruns << std::endl + << "RTT value tested: " << (rtt*1e3) << " ms" << std::endl + << "ACKs received: " << ack << "/" << nruns << std::endl + << "Underruns: " << underflow << std::endl + << "Late packets: " << time_error << std::endl + << "Other errors: " << other << std::endl + << std::endl; return EXIT_SUCCESS; } |