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Re: [gpsd-dev] Heads up, GPSD release 3.12 is imminent
From: |
Eric S. Raymond |
Subject: |
Re: [gpsd-dev] Heads up, GPSD release 3.12 is imminent |
Date: |
Sun, 25 Jan 2015 20:38:55 -0500 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Hal Murray <address@hidden>:
> I've lost my touch or something. I haven't been able to make it fail today.
> It's been running fine for several hours.
That is weird. And not good.
> Poking around with gpsmon...
> I've seen a PPS-offset of -1422231249.00004
> (The 4 is overriding the | at the right boundary of box.)
> It flips back and forth between normal and crazy like above. I haven't seen
> a pattern of good/bad. Just wait a few seconds and I get a bad one. The
> above is a typical bad one. I think all the bad ones have started with
> -14xxx and had the decimal point in the same place.
>
> The GPS hardware is a MR-350P going through a TAPR FAT-PPS pulse stretcher
> and then through a splitter. The FAT-PPS makes a 100 ms pulse. (The raw PPS
> signal on the MR-350P is only 1 microsecond wide.)
>
> The serial string is offset by roughly 1/2 second. I wouldn't be surprised
> to see it fall on either side of the middle of the second. That may be the
> thing that has changed: the timing on the serial strings sweeps over a 100 ms
> range with a time scale of many hours.
>
> It would be nice if the PPS line in the log file included the offset or a
> time stamp.
Hey, Gary! Can you do that?
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
Re: [gpsd-dev] Heads up, GPSD release 3.12 is imminent, Greg Troxel, 2015/01/25