pps

[codearrangertoo]

To enable the GPS as a pps source. Do the following.

add "dtoverlay=pps-gpio,gpiopin=25" to a new line in /boot/config.txt

add "pps-gpio" to a new line in /etc/modules

install pps tools:

sudo apt-get install pps-tools

reboot

run ppstest /dev/pps0

your output should look like this:

$ sudo ppstest /dev/pps0 trying PPS source "/dev/pps0" found PPS source "/dev/pps0" ok, found 1 source(s), now start fetching data... source 0 - assert 1427275430.004698032, sequence: 613 - clear 0.000000000, sequence: 0 source 0 - assert 1427275431.004698969, sequence: 614 - clear 0.000000000, sequence: 0 source 0 - assert 1427275432.004700114, sequence: 615 - clear 0.000000000, sequence: 0 source 0 - assert 1427275433.004703447, sequence: 616 - clear 0.000000000, sequence: 0 source 0 - assert 1427275434.004705218, sequence: 617 - clear 0.000000000, sequence: 0 source 0 - assert 1427275435.004708186, sequence: 618 - clear 0.000000000, sequence: 0 source 0 - assert 1427275436.004709644, sequence: 619 - clear 0.000000000, sequence: 0 ^C