Find infos on how to use the PRUSS in the PRU FAQ 
<https://groups.google.com/forum/embed/?place=forum/beagleboard&showsearch=true&showpopout=true&showtabs=true&hideforumtitle=true&parenturl=http%3A%2F%2Fbeagleboard.org%2FCommunity%2FForums#!category-topic/beagleboard/u28ytaoNenU>
.

I'd try the inbuild eCAP device. It's connected to header P9_42, mode 3 
(pr1_ecap0_ecap_cap_in_apwm_o).

Am Mittwoch, 9. Oktober 2013 16:32:58 UTC+2 schrieb [email protected]:
>
> Hello, I would like to know how to use the PRU to measure the duration of 
> a pulse sent by an ultrasonic sensor, I must do
> this since Linux is not able to use real hard interrupts, so it won't be 
> able to get acurate data off them.
>
> I would like to know if this is possible using the on board PRU , and 
> where i could find some documentation on them (how to program them, 
> how they send data to the beaglebone). I am asking for help since most 
> newbie tutorials are just focused on GPIO and PWM.
>
> Thanks in advance!
>

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