diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/output/USRPTime.cpp | 80 |
1 files changed, 37 insertions, 43 deletions
diff --git a/src/output/USRPTime.cpp b/src/output/USRPTime.cpp index 9ed398e..59fa6b5 100644 --- a/src/output/USRPTime.cpp +++ b/src/output/USRPTime.cpp @@ -217,64 +217,58 @@ bool USRPTime::gpsdo_is_ettus() const return (m_conf.refclk_src == "gpsdo-ettus"); } +/* Return a uhd:time_spec representing current system time + * with 1ms granularity. */ +static uhd::time_spec_t uhd_timespec_now(void) +{ + using namespace std::chrono; + auto n = system_clock::now(); + const long long ticks = duration_cast<milliseconds>(n.time_since_epoch()).count(); + return uhd::time_spec_t::from_ticks(ticks, 1000); +} + void USRPTime::set_usrp_time_from_localtime() { etiLog.level(warn) << "OutputUHD: WARNING:" " you are using synchronous transmission without PPS input!"; - struct timespec now; - if (clock_gettime(CLOCK_REALTIME, &now)) { - etiLog.level(error) << "OutputUHD: could not get time :" << - strerror(errno); - } - else { - const uhd::time_spec_t t(now.tv_sec, (double)now.tv_nsec / 1e9); - m_usrp->set_time_now(t); - etiLog.level(info) << "OutputUHD: Setting USRP time to " << - std::fixed << t.get_real_secs(); - } + const auto t = uhd_timespec_now(); + m_usrp->set_time_now(t); + + etiLog.level(info) << "OutputUHD: Setting USRP time to " << + std::fixed << t.get_real_secs(); } void USRPTime::set_usrp_time_from_pps() { + using namespace std::chrono; + /* handling time for synchronisation: wait until the next full * second, and set the USRP time at next PPS */ - struct timespec now; - time_t seconds; - if (clock_gettime(CLOCK_REALTIME, &now)) { - etiLog.level(error) << "OutputUHD: could not get time :" << - strerror(errno); - throw std::runtime_error("OutputUHD: could not get time."); - } - else { - seconds = now.tv_sec; - - MDEBUG("OutputUHD:sec+1: %ld ; now: %ld ...\n", seconds+1, now.tv_sec); - while (seconds + 1 > now.tv_sec) { - usleep(1); - if (clock_gettime(CLOCK_REALTIME, &now)) { - etiLog.level(error) << "OutputUHD: could not get time :" << - strerror(errno); - throw std::runtime_error("OutputUHD: could not get time."); - } - } - MDEBUG("OutputUHD:sec+1: %ld ; now: %ld ...\n", seconds+1, now.tv_sec); - /* We are now shortly after the second change. */ - - usleep(200000); // 200ms, we want the PPS to be later - m_usrp->set_time_unknown_pps(uhd::time_spec_t(seconds + 2)); - etiLog.level(info) << "OutputUHD: Setting USRP time next pps to " << - std::fixed << - uhd::time_spec_t(seconds + 2).get_real_secs(); - } + auto now = uhd_timespec_now(); + const time_t secs_since_epoch = now.get_full_secs(); - usleep(1e6); - etiLog.log(info, "OutputUHD: USRP time %f\n", - m_usrp->get_time_now().get_real_secs()); + while (secs_since_epoch + 1 > now.get_full_secs()) { + this_thread::sleep_for(milliseconds(1)); + now = uhd_timespec_now(); + } + /* We are now shortly after the second change. + * Wait 200ms to ensure the PPS comes later. */ + this_thread::sleep_for(milliseconds(200)); + + const auto time_set = uhd::time_spec_t(secs_since_epoch + 2); + etiLog.level(info) << "OutputUHD: Setting USRP time next pps to " << + std::fixed << time_set.get_real_secs(); + m_usrp->set_time_next_pps(time_set); + + // The UHD doc says we need to give the USRP one second to update + // all the internal registers. + this_thread::sleep_for(seconds(1)); + etiLog.level(info) << "OutputUHD: USRP time " << + std::fixed << m_usrp->get_time_now().get_real_secs(); } - } // namespace Output #endif // HAVE_OUTPUT_UHD |