en:c1_gpio_pps [ODROID Wiki]

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====== GPIO PPS Client ======

In this example I've choose pin #7 to be my PPS input. You can use any other GPIO [[en:c1_hardware#expansion_connectors|Here]].


== Enabling GPIO PPS Client ==
<code>
sudo -s
apt-get install device-tree-compiler pps-tools
fdtput -c /media/boot/meson8b_odroidc.dtb /pps
fdtput -t s /media/boot/meson8b_odroidc.dtb /pps compatible "pps-gpio"
fdtput -t s /media/boot/meson8b_odroidc.dtb /pps gpios "GPIOY_3"
</code>

Reboot the board to test. 


== Testing GPIO PPS Client == 
Start feeding the signal to the selected pin (#7 in this example). Remember that the logic voltage is 3.3V.

<code>
sudo -s
ppstest /dev/pps0
</code>

Will output something like:

<code>
source 0 - assert 1439248167.494093618, sequence: 552 - clear  0.000000000, sequence: 0
source 0 - assert 1439248167.494140618, sequence: 553 - clear  0.000000000, sequence: 0
</code>

Note this example will only run on kernel 3.10.80-122 or greater.