[time-nuts] measuring os latency for pps

[folkert]

Hi,

Not sure if it is interesting for you guys but I wrote a simple program
for e.g. Linux (or any other system with the pps api implemented) that
listens on a pps source waiting for a pulse and then toggles a gpio
pin. That way you can measure the latency introduced by the the kernel
when listening from userspace. Note that there's a little extra latency
due to the gpio-pin handling.

It is on github: https://github.com/flok99/pps2gpio


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