Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3

[Gary E. Miller]

Yo Hal!

On Mon, 25 Apr 2016 10:54:15 -0700
Hal Murray <address@hidden> wrote:

> >> address@hidden said:  
> >>> Nothing confusing to gpsd at all.  gpsd is just reporting there
> >>> is no PPS   
> or
> >>> PPS available on that serial line.  Which is exactly true.  Maybe
> >>> the message could be clearer.   
> 
> address@hidden said:
> >> There are two cases of "no PPS".  One is that nothing is wired to
> >> that pin.  
> > Right.  We know this isn't the problem as ppstest can see RFC2783
> > events through .dev/pps0   
> 
> The real problem is that gpsd doesn't have the idea of stand-alone
> PPS files (/dev/pps0 and such).  It assumes everything on the command
> line is a TTY and that it can get the PPS stuff from there.

Uh, no.  gpsd very much detects standalone PPS and handles it differently.

Check out the source_pps flag.  I'm not saying it is perfect, but gpsd
does try to do the right thing.

> I was pointing out that things get messy if you try to make decisions
> based on the presence of PPS data when you open the TTY file and then
> setup the RFC2783 stuff from there.

Good, cause gpsd does not do it that way.
 
> I think the fix will require something like a flag on the command
> line that says the next parameter is the PPS for the previous TTY.
> Maybe: gpsd /dev/ttyX0 --pps /dev/pps0

No need, it is auto detected.  Bug reports welcome.

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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