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Re: [gpsd-dev] Initialization & probing questions

From: Gary E. Miller
Subject: Re: [gpsd-dev] Initialization & probing questions
Date: Mon, 26 Mar 2018 15:16:42 -0700

Yo Hal!

On Mon, 26 Mar 2018 15:09:39 -0700
Hal Murray <address@hidden> wrote:

> address@hidden said:
> > Which is why we always recommend to set the GPS to the right serial
> > port speed before starting gpsd.  
> >> Is there a simple way (at least during development) to cut this
> >> down to something more reasonable?  
> > stty -F /dev/ttyS0 115200   
> My reading is that the GPS is already at the "right" speed.  It's the
> serial port that needs fixing.  That seems to be confirmed by your
> stty example.

"right" is whatever you want.  But the serial port speed and the GPS
speed must match for anything to happen.

> Does gpsd try with the current/initial serial port speed before it
> starts scanning other speeds?


Just be careful with higher speeds.  Some GPS work fnr for me at 460800
other have issues at 115200.

> > You could, but then that makes other things hard.  I prefer to just
> > leave the GPS as is on exit.  Makes debugging easier.  Opinions
> > vary.   
> I like the "leave it alone" approach.  I use gpsmon to switch between
> binary and text/NMEA so other hacks don't have to mess with that
> stuff.  No big deal.

Like a lot of stuff, try it.  Be prepared to change your mind when the
unexpected/unwanted happens.

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

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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