Re: [gpsd-users] syslog error message with new version - kernel PPS failed Connection timed out

[Gary E. Miller]

Yo hans!

On Tue, 18 Aug 2015 21:31:06 +0200
hans mayer <address@hidden> wrote:

> Yo Garry,

Just one 'r'.  Gary.

>  > Odd, the source for pps-ktimer says it is a client, not a source.
> 
> It's a client as it has no own time source. It takes the
> kernel time to generate the 1PPS information.

Whcih makes it a server to my mind.  All in your point of view.

>  > And how exactly did you try it?
> 
> This is the way I try to use gpsd ( without success ) with
> the PPS signal of gps-hardware with pps-gpio" kernal module.

Different topic.  Already asked and answered in previsou emails.

> For test reasons in combination with pps-ktimer I tried this:
> 
> gpsd -n -F /var/run/gpsd.sock
> -P /var/run/gpsd.pid /dev/ttyS2 /dev/pps1

That should work, assuming the sysclock is pretty close to the
/dev/ttyS2 clock.  Otherwise it should fail, so a really poor test.

> And this is the syslog:
> 
> Aug 18 21:14:37 gps0 kernel: [343435.561377] pps_ldisc: PPS line 
> discipline registered
> Aug 18 21:14:37 gps0 kernel: [343435.572084] pps pps2: new PPS source 
> serial2
> Aug 18 21:14:37 gps0 kernel: [343435.580213] pps pps2: source 
> "/dev/ttyS2" added
> Aug 18 21:14:37 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> PPS failed Interrupted system call
> Aug 18 21:14:37 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/pps1 kernel
> PPS failed Interrupted system call
> Aug 18 21:14:37 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> PPS failed Interrupted system call
> Aug 18 21:14:37 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/pps1 kernel
> PPS failed Interrupted system call
> Aug 18 21:14:37 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> PPS failed Interrupted system call
> Aug 18 21:14:40 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> PPS failed Connection timed out
> Aug 18 21:14:43 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> PPS failed Connection timed out
> Aug 18 21:14:46 gps0 gpsd[29883]: gpsd:ERROR: KPPS:/dev/ttyS2 kernel
> PPS failed Connection timed out

The /dev/ttyS2 fails as expected, as it should, because of the deficient
RasPi tty's.   Already asked and answered in previous emails.

The ERROR is alarmist, I just changed git head to drop that to a WARN.
It just means no time stamp was available, thus a timeout.  This is normal
on some GPS if no sat lock.

The EINTR just means that no edge was detected, I just changed that to
an INFO log.

So really nothing to see here, all as it should be.

> I tried to figure out if there is maybe an issue with
> this "pps-gpio" module. But the errors are the same.

Well, none of this is a problem.  A problem would be if you do not
get good time from /dev/pps1.

> Has this warning any relevance for general functionality
> gpsd:WARN: KPPS:/dev/pps0 missing PPS_CAPTURECLEAR, pulse may be
> offset

Nope, that is a known bug in the pps-gpio driver.  I submitted a kernel
page 6 months ago.  So, a different, unrelated issue.

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

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