On 10/02/2019 09:04 AM, Baroch Oren via USRP-users wrote:
3. If I use usrp->set_time_source("external") I get an error "At least
one PLL did not lock!" or "Failed to capture PPS within 1.1 seconds.
TDC_STATUS: 0x0"
and if I use "gpsdo", I cannot get any feedback that gps is pps locked
and used. only the message "1) catch time transition at pps edge 2)
set times next pps (synchronously)" - does it mean that gps is locked?
The GPSDO will still produce 1PPS pulses even when it isn't locked to
the GPS constellation. You'll need to query the "gps_locked" sensor.
4. how can I get NMEA string from the internal GPSDO of the N310?
The "sensor" interface relating to the GPSDO can be queried with the
"sensors" API. An example of the usage of that API is in the utility
program:
query_gpsdo_sensors
If you have the UHD source code at hand, it'll be under uhd/host/examples
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