[gpsd-dev] refclock 28 gone wacky on me

Gary E. Miller gem at rellim.com
Fri Jun 10 00:08:08 UTC 2016

Yo Hal!

On Thu, 09 Jun 2016 17:04:08 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:

> > GPS module is a ST22, SkyTraq Venus 6 chipset.  
> [ntpq -p shows PPS link off by a second.]
> It's a gpsd bug/quirk.  I've seen the same thing on a PC with a Venus
> chip connected via USB.
> I mentioned it a month or two ago but it fell through the cracks.

Can you send me the output of this when it fails:

# gpsd -nND 9 /dev/ttyXXX |& fgrep PPS > gpsd.log

That tells me which path I need to check for errors.

> gem at rellim.com said:
> > I suggest 38400 or higher.  9600 or less would cause this exact
> > symptom.   
> I thought gpsd was supposed to do the right thing.

gpsd does not know how backedup the OS serial buffer is.  Just like
another buffer bloat problem.

> gem at rellim.com said:
> > Got a scope?   
> I have one.  I'm seeing a 10 microsecond pulse.  One per second.

Well, then not the case at hand.  the current problem is two edges
per second, 500 milliSec apart.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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