Connect your external clock and let the PRU watch a GPIO pin or an analog 
> input and start the measurement on a certain state. Check out the triggers 
> <http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/_cha_examples.html#SubSecExaTriggers>
>  
> example.


I don't have an external clock that I can use a trigger..!

I cant say, unless you specify your requirements.

 I need to timetag the samples with an accuracy in the order of us (or less 
if possible) referred to the system clock previously  synchronized with ntp.


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