Re: [gpsd-dev] gpsmon vs PPS via USB

[Hal Murray]

> # gpsd -nND9 /dev/ttyS0 | egrep 'PPS|NTP'

Thanks.

Does this make sense?

gpsd:RAW: PPS pps-detect on /dev/ttyUSB0 invisible pulse
gpsd:PROG: PPS edge: 1, cycle:  999930 uSec, duration:       0 uSec @ 
1387072597.001219030
gpsd:RAW: PPS edge accepted invisible pulse
gpsd:INFO: PPS hooks called with accepted 1387072597.001219030 offset 
-0.001219030
gpsd:PROG: PPS edge accepted 1387072597.001219030 offset -0.001219030
gpsd:RAW: PPS pps-detect on /dev/ttyUSB0 invisible pulse
gpsd:PROG: PPS edge: 0, cycle:  999903 uSec, duration:       0 uSec @ 
1387072597.521167300
gpsd:RAW: PPS edge rejected this second already handled

I assume "invisible pulse" means one that is narrow enough so that it has 
switched back to the initial state by the time gpsd gets a chance to look at 
things, perhaps because it's spending a lot of time printing stuff out.

I expect this PPS to be 1/2 second wide.  I've seen it use the wrong edge.  
Right now, gpsmon is missing most of the pulses.


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