[Top][All Lists]

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

Re: [gpsd-users] GPSD SOCK output without PPS

From: Gary E. Miller
Subject: Re: [gpsd-users] GPSD SOCK output without PPS
Date: Wed, 12 Sep 2018 15:39:33 -0700

Yo Zach!

On Wed, 12 Sep 2018 17:18:45 -0400
Zach LaCelle <address@hidden> wrote:

> Command line args:
> /usr/sbin/gpsd -N -n /dev/ublox


Why the -N?  That is mostly for debug.  gpsd is usually daemonized.

Why /dev/ublox?  I assume that is just a link to /dev/ttyUSB0?

If you are doing hotplugging often better to use the -F option.  That
lets udevd handle the hot plug events.  Hot plugging hhard coded pors
is not really supported by gpsd.

> Not using systemd, launching through System V using /etc/init.d/gpsd
> script.

That works.

> I do have a /dev/pps0 device which is added when I attach the
> receiver. ppstest returns the following (and you mentioned it's
> disconnected, so no surprise):

Yeah, as expected.  The USB driver brings out PPS, but the EVK-7 does
not bring out PPS.

> As I understand it, the SOCK connection includes PPS information,
> correct?

Yes, if available, very similar to the SHM connection.  

PPS over USB only good to around 1 micro second.

> My thought was I just set up SOCK, then once I get PPS
> integrated (either by wiring up the 7 or by getting an EVK-8) I won't
> have any config changes.

I think you'll still need ito add a PPS wire on the EVK-8 to get it to the
USB.  Other 8 boards have it wired up already, for a lot less cash.

Once again, SOCK or SHM, pretty much the same results.  If one works for
you no reason to change.

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

Attachment: pgpb6iuLuFXm1.pgp
Description: OpenPGP digital signature

reply via email to

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