stratum one on pi 4?

[Hal Murray]

On Linux, you can sanity check the PPS connection with something like:
[murray ~]$ more /sys/devices/virtual/pps/pps0/assert
1568975296.033079224#30
[murray ~]$ more /sys/devices/virtual/pps/pps0/clear
1569003643.999925967#28378
[murray ~]$ 



-- 
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