diff options
Diffstat (limited to 'host/examples')
| -rw-r--r-- | host/examples/tx_waveforms.cpp | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/host/examples/tx_waveforms.cpp b/host/examples/tx_waveforms.cpp index 9254c3b24..942b5df7b 100644 --- a/host/examples/tx_waveforms.cpp +++ b/host/examples/tx_waveforms.cpp @@ -178,15 +178,17 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ std::vector<std::complex<float> > buff(spb); std::vector<std::complex<float> *> buffs(channel_nums.size(), &buff.front()); - //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); - std::cout << boost::format("Setting device timestamp to 0...") << std::endl; - usrp->set_time_now(uhd::time_spec_t(0.0)); + if (channel_nums.size() > 1) { + // This is the worst-case setup scenario, because this example has to + // work for all configurations. set_time_now() and set_time_next_pps() + // might also work, depending on what USRPs are being used, and can + // accelerate the setup. To keep this example generic, we use + // set_time_unknown_pps() to guarantee synchronization. + usrp->set_time_unknown_pps(uhd::time_spec_t(0.0)); + } else { + usrp->set_time_now(uhd::time_spec_t(0.0)); + } //Check Ref and LO Lock detect std::vector<std::string> sensor_names; @@ -211,6 +213,14 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ std::signal(SIGINT, &sig_int_handler); std::cout << "Press Ctrl + C to stop streaming..." << std::endl; + // Set up metadata. We start streaming a bit in the future + // to allow MIMO operation: + uhd::tx_metadata_t md; + md.start_of_burst = true; + md.end_of_burst = false; + md.has_time_spec = true; + md.time_spec = usrp->get_time_now() + uhd::time_spec_t(0.1); + //send data until the signal handler gets called while(not stop_signal_called){ //fill the buffer with the waveform |