en:c2_gpio_pps [ODROID Wiki]

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

In this example I've choose pin #12 (GPIOX.BIT10) that's GPIO 238 to be my PPS input. You can use any other GPIO [[en:c2_hardware#expansion_connectors|Here]]. \\
Check the pin number and export number to use on gpio_pin

Thanks to dan_d for providing kernel patchs + forum info.
[[http://forum.odroid.com/viewtopic.php?f=136&t=21733&p=148292#p148292|Forum Thread]]

== Enabling GPIO PPS Client ==
<code>
sudo -s
apt-get install pps-tools
echo pps-gpio > /etc/modules-load.d/pps-gpio.conf
echo options pps-gpio gpio_pin=238 > /etc/modprobe.d/pps-gpio.conf
modprobe pps-gpio
</code>


== Testing GPIO PPS Client == 
Start feeding the signal to the selected pin (#12 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 3.14.65-69 or greater.