stratum one on pi 4?

Gary E. Miller gem at
Sat Sep 21 03:21:03 UTC 2019

Yo Paul!

On Fri, 20 Sep 2019 20:12:04 -0700
Paul Theodoropoulos via users <users at> wrote:

> On 9/20/2019 17:59 PM, Gary E. Miller via users wrote:
> > Oh, not good.  You forgot "-n /dev/pps0".  
> I just had a look at the INSTALL docs on the release version, it says
> "If you are on the RasPi with gpsd version 3.17, or above, /dev/pps0
> can be autodetected. and used for PPS if available."

Only if you configured with the MAGIC_HAT option.

> So that would
> explain why gpsd works fine on my other two raspi's, without
> /dev/pps0 declared...
> > 3.19 has been released.  3.19.1~dev is the current git.  

Sort of.  There is more to MAGIC_HAT that just /dev/pps0.

> The INSTALL file needs an update - it still talks about Debian
> Wheezy, and refers to Debian Jessie as the current release. I'll see
> about sending in updates.

A lot of people still have Wheezy.  Looking forward to updates.

> I'm going to rebuild gpsd from release, maybe it actually is
> something there...

Latest release is always best.  From git head second best.

> ...and rather than draw out the discussion, I downloaded the release 
> version, built it with identical scons options, and poof - instant
> SHM(0) PPS output.

Version 3.19?  That's good.  What about git head?

Any ideas what was wrong with your earlier copy?  Or too old to care?

> Oh well, go figure. I'd be surprised if this was a bug in that
> particular git release - I'm suspecting that I may have had the UART
> settings gummed up before building gpsd, and for some reason the
> built code couldn't grok PPS - even though the gpsd -h output said it
> was enabled. Maybe.

All scons cares about is if it found the pps headers, timeservce, and
magichat.  Let us know if you figure it out.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at  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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