The PRU on the BeagleBone each include an enhanced capture module that
can be used as you describe.
It has a 32 bit timer that is latched into one of the capture
registers. The timers are independent of
the timer used by the Linux system so I'm not sure how you would tie
them into use with NTP. But they
do look like they would be useful for monitoring a GPSDO as Chris
described. There are 4 capture
registers in each eCAP so they would also be useful for
monitoring/timestamping other signals.
On 3/22/2014 17:44, Hal Murray wrote:
[email protected] said:
Would you know which other systems include the PRUs? Is it only in the TI
products? It seems like an ideal solution to the problem of
non-deterministic latency.
There is a much simpler solution - avoid the latency by using a counter/timer
to capture the counter on an external event. (That may assume you are using
the same counter for timekeeping.) Many ARM chips come with a blizzard of
peripherals. Good counter/timers are common.
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