Re: garmin serial probe or force garmin serial mode.

[Gary E. Miller]

Yo Philip!

On Tue, 31 Mar 2020 16:39:35 +1300
Philip Lamb <address@hidden> wrote:

> On 31/03/2020, at 1:01 PM, Gary E. Miller <address@hidden> wrote:
> > According the their manual, The Geko is NMEA only.  It does not
> > support Garmin Binary.  See Appendix A, and Appendix C.
> > 
> > http://static.garmin.com/pumac/Geko201_OwnersManual.pdf
> > 
> > When the config offers "Garmin", that is just enabling some
> > proprietary NMEA sentences: $PGRME, $PGRMM, $PGRMZ, and $PSLIB.  
> 
> Actually, that's not correct. The Geko 201 and 301 do output NMEA
> (and it outputs the proprietary sentences even when NMEA mode is
> selected) but also support Garmin binary,

Got any dopcumentation on that?  Like what version of Garmin binary
it supports?

Any way I can get a raw dump of your garmin binary stream?

    $ gpspipe -R -n 300 > raw.log

> 
> So, this motivated me to go and look at why the stream is not
> starting, and with a small change in driver_garmin.c I have found a
> fix and it works now:
> 
> What was required was to replace the NULL value for the field
> '.event_hook' in the structure driver_garmin_ser_binary, with
> 'garmin_event_hook' (i.e. so that it matches the one used in
> driver_garmin_usb_binary).

Can you please send that as a proper diff?  A simple "git diff"
should do.

> I'm happy to submit this one-line change as a patch, although I don't
> know enough about the rest of the gpsd serial system to know whether
> this would have side-effects elsewhere. Any thoughts?

I have some garmins layong around, and other receivers, so easy to test.

I wrote that over a decade ago.  I think all that does is probe the
GPS to wake is up.  The USB ones needed it, but not the serial ones,
until now.  Certainly worth some testing.

RGDS
GARY
---------------------------------------------------------------------------
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

pgp2R8gsC83_b.pgp
Description: OpenPGP digital signature