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Re: [gpsd-dev] Please review Miroslav's attempted fix.

From: Miroslav Lichvar
Subject: Re: [gpsd-dev] Please review Miroslav's attempted fix.
Date: Fri, 22 Aug 2014 14:26:36 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

On Fri, Aug 22, 2014 at 01:25:10PM +0200, Miroslav Lichvar wrote:
> On Fri, Aug 22, 2014 at 06:14:40AM -0400, Eric S. Raymond wrote:
> > Miroslav Lichvar <address@hidden>:
> > > With the patch, do you see any "PPS: no current GPS seconds:"
> > > messages? It would be useful to see the full debug output.
> > 
> > I don't know whether that message comes up from gpsd, because I noticed the
> > bug and verified the fix with gpsmon. With your patch in place there were
> > no PPS-event bars in the gpsmon display; when I reverted it, they were
> > restored.

> I have a Garmin 18x and it works for me. It sends the NMEA messages
> about 0.5 seconds after the pulse. I suspect your GPS may be sending
> them too close to the pulse and the pulses are rejected as too old
> or from the future.

>From ppsthread.c:

 * FIXME! The GR-601W at 38,400 or faster can send the
 * serial fix before PPS by about 10 mSec!

This probably explains why it doesn't work for you. Adding a
time_offset function to the ubx driver might fix this.

Miroslav Lichvar

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