Hi all - I have an Octoclock-G. I'm trying to get confirmation on what
get_sensor("gps_time") actually returns.
I guess it's not number of seconds since the GPS epoch (Jan 6 1980), as I
had assumed from the tag "gps_time".
It looks more like Unix seconds. So, seconds since the Jan 1 1970 epoch
(UTC epoch).
Is that right, and if so, how are leap seconds handled? If it uses the Unix
epoch then I would guess it is also subtracting leap seconds, but that's
just a guess..
If indeed it is returning Unix time, then I believe this would be correct
(for now, until the next leap sec):
gpsSeconds = get_sensor("gps_time") - 315964782;
Our code looks something like:
uhd::device_addr_t dev_addr_octoclock;
dev_addr_octoclock["addr0"] = "192.168.13.1";
uhd::usrp_clock::multi_usrp_clock::sptr octoclock =
uhd::usrp_clock::multi_usrp_clock::make(dev_addr_octoclock);
signed gps_time = octoclock->get_sensor("gps_time",0).to_int();
Thanks much,
Eric
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