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Forum Index : Microcontroller and PC projects : Math.PID question.

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PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1531

Posted: 11:04am 16 Sep 2025

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Hey Pete

I don't have the PicoMite source as I don't follow that stuff too well:

When we have multiple PIDs running, I get the impression that the ISRs are triggering at different times(?) Not all lumped in one ISR.

If this is true, are they evenly spaced?

IOW, if I have four PIDs running @1KHz, are they triggering in-turn every 250µS?

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10399

Posted: 11:35am 16 Sep 2025

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No:
They each run at 1mSec intervals from the time each one is started
Edited 2025-09-16 21:35 by matherp

PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1531

Posted: 12:04pm 16 Sep 2025

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matherp said No:
They each run at 1mSec intervals from the time each one is started

Awesome

sync 245
Math pid start 1
sync
Math pid start 2
sync
Math pid start 3
sync
Math pid start 4

If I use all the same data, I get 4KHz

PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1531

Posted: 12:32pm 16 Sep 2025

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Gut feeling is that; spreading out the PID STARTs is probably a good thing, no matter what(?)

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