I have a BBB Wireless running Linux beaglebone 4.14.108-ti-r106 #1 SMP 
PREEMPT Fri May 24 22:12:34 UTC 2019 armv7l GNU/Linux

I am writing in C.

I turn a valve on and then need to read some sensors for N milliseconds and 
then turn the valve off.

What's the best way to read milliseconds on the BBBw?  I don't have a RTC 
on this particular unit but could add one using I2C.  I have an Adafruit 
4282 with a DS3231 RTC on it on another BBBw that I could use temporarily 
to prove it works.  What other options are available?


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