Re: [gpsd-dev] refclock 28 gone wacky on me

[Gary E. Miller]

Yo Hal!

On Thu, 09 Jun 2016 17:04:08 -0700
Hal Murray <address@hidden> 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.

> address@hidden 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.

> address@hidden 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.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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