On Wed, 2 Feb 2022, Thaddeus Waldner wrote:
Date: Wed, 2 Feb 2022 15:45:16 -0600
From: Thaddeus Waldner <thadw...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Stepper PID
> I suspect that you are not using the DPLL, or that it is not setup properly.
For a RPI4 I would suggest these settings:
setp hm2_7i76e.0.dpll.01.timer-us -200
set hm2_7i76e.0.stepgen.timer-number 1
These should reduce the stepgenb position sampling jitter to a
fraction of 1 usec.
Forgot to add that you need to run ntpd on the RPI, not timesyncd
as timesyncd makes step changes in LinuxCNC's timebase, messing up
the servo thread period.
Peter Wallace
Mesa Electronics
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