Re: How to tune one shot time period

How do you set the period, i.e:  what RTAI timing function do you use for that? 
Paolo
________________________________________
From: Rtai [[email protected]] on behalf of Randy Ricklefs [[email protected]]
Sent: Friday, December 18, 2015 7:37 PM
To: [email protected]
Subject: [Rtai] How to tune one shot time period

Hi,

I am working on a project that requires a 100msec loop that has a drift
of no more than about 100usec per hour. I am using the oneshot mode with
RTAI 4.1 with kernel 3.10.32 on an i7 computer, and the 100msec period
is very stable (+/- a few usec), but compared to the system time and UTC
is actually larger than 100msec by an amount than creates a drift rates
close to 10msec every 10 or 20 minutes. I have tried varying the 100msec
period by small amounts to compensate, but the results are not
satisfactory. I understand there is a method of calibrating the timer
used for oneshots, but I have not found documentation of the procedure.
Once calibrated, will the period remain stable, or are there temperature
variations? Any help would be appreciated!

Thanks!

Best regards,
Randy Ricklefs
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