Re: [chrony-users] Setting up Chrony with PPS

[Deven Hickingbotham <devenh@xxxxxxxxxxx>]

Rob,

Thanks for replying.

A little more info: my system is a Raspberry Pi 2 B.  I have been able 
to get ntp to work with pps via GPIO pin 4.  Had to recompile ntp to 
activate the pps support.

Don't let the above fool you into thinking I know what I am doing.  I 
have some level of expertise with programming, but system level Linux 
stuff is a mystery to me.  IOW, real clear step by step instructions are 
greatly appreciated!

> If either module is being loaded, you should see a device (e.g. pps0) in
> /sys/class/pps. If your GPS has a lock and the pps kernel module is
> configured properly, you should see timestamps updating every second, e.g.

Yes, the /sys/class/pps/pps0 path exists and contains these files: 
subsystem (folder), assert, clear, dev, echo, mode, name, path, and uevent.

> $cat /sys/class/pps/pps0/assert
> 1455831692.018636856#178
>
> Are you seeing those?

Yes, but just one timestamp per execution:

pi@gps ~ $ cat /sys/class/pps/pps0/assert
1455835119.289108505#4272
pi@gps ~ $ cat /sys/class/pps/pps0/assert
1455835154.690359907#4305
pi@gps ~ $ cat /sys/class/pps/pps0/assert
1455835157.936493770#4308
pi@gps ~ $ cat /sys/class/pps/pps0/assert
1455835160.102904599#4310

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