On 11/23/19 1:53 AM, Richard Laager via devel wrote: > > On ntp2 (again, this is the u-blox 6 eval kit), I'm getting duplicated > sequence numbers, which doesn't seem quite right: > > rlaager@ntp2:~$ sudo ppstest /dev/pps0 > trying PPS source "/dev/pps0" > found PPS source "/dev/pps0" > ok, found 1 source(s), now start fetching data... > source 0 - assert 1574493759.100134288, sequence: 93299 - clear > 1574493760.000155012, sequence: 93299 > source 0 - assert 1574493760.100134349, sequence: 93300 - clear > 1574493760.000155012, sequence: 93299 > source 0 - assert 1574493760.100134349, sequence: 93300 - clear > 1574493761.000138190, sequence: 93300
Okay, so upon further reflection, the timestamps seem to indicate that I need to use the clear/falling edge. This also explains the duplication, I think. This is despite the GPS being configured for rising edge. So as Hal (I think) said, something is inverting the signal. I thought I had tested with a "flag2 1" on the PPS driver, but I'll retest that. I also want to test changing the GPS to falling edge, such that the server should see it as rising edge. -- Richard
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