Thread scheduler for PID period control ?

[Ether]

Originally Posted by Joe Ross

I just ran the following code:

    double prevTime = 0;
    public void teleopPeriodic() {
        double time = Timer.getFPGATimestamp();
        System.out.println(time-prevTime);
        prevTime=time;
    }

And got the following output...

I took the liberty of plotting it. Attached.

[gpetilli]

That is what I expected, which is why I was confused. I should get the 4 slot cRIO today and will retry. I know the older 8 slot was slower, but it seems strange that they would change the driver station behavior to update less often.

[Joe Ross]

Originally Posted by gpetilli

That is what I expected, which is why I was confused. I should get the 4 slot cRIO today and will retry. I know the older 8 slot was slower, but it seems strange that they would change the driver station behavior to update less often.

My test was run on an 8-slot. The 8-slot has less ram, but the same processor. In this test, it is not slower.

[gpetilli]

Originally Posted by Joe Ross

My test was run on an 8-slot. The 8-slot has less ram, but the same processor. In this test, it is not slower.

Thanks for the feedback, i will have them re-run the test. BTW: what period do you use for your PID loops?