[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [gpsd-dev] [PATCH] HOWTO: calculate the average GPS offset

From: Gary E. Miller
Subject: Re: [gpsd-dev] [PATCH] HOWTO: calculate the average GPS offset
Date: Mon, 21 Oct 2013 18:40:28 -0700

Yo Andy!

On Mon, 21 Oct 2013 21:31:20 -0400
Andy Walls <address@hidden> wrote:

> On Mon, 2013-10-21 at 21:14 -0400, Andy Walls wrote:
> > Hi Gary:
> > 
> > On Mon, 2013-10-21 at 16:52 -0700, Gary E. Miller wrote:
> > > Yo Andy!
> > > 
> > > On Mon, 21 Oct 2013 19:43:10 -0400
> > > Andy Walls <address@hidden> wrote:
> > gpsd-3.7 ntpshm.c:init_kernel_pps()'s algorithm will never
> > associate my GPIO /dev/pps0 with the serial port of the GPS,
> > AFAICT, so it will never use it.

Maybe we shuold fix that.
> Which, by the way boggles, my mind.  The number of systems with a GPS
> and multiple /dev/ppsN devices nodes has to be vanishingly small, no?

Not amound time nuts!  When in doubt a lot of people use multiple GPS
so they can be compared against each other.

Also, Intel is adding PPS to their ether controllers.  Soon every one
of your ethernet cards may have a /dev/pps0.

> If there is only one /dev/ppsN device node, why can't GPSD just assume
> that it is acceptable to use it with the GPS?

I hate making assumptions that can fail in common configurations.  I can
see having an explicit way to force an association.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

Attachment: signature.asc
Description: PGP signature

reply via email to

[Prev in Thread] Current Thread [Next in Thread]