Why can't I select non-16 microstepping on external drivers?
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I'm upgrading a CNC using a Duet2 with breakout board.
I was hoping to imitate the original (at least at first) but the external drivers were all set to 8 (or 5) microsteps. As far as I can tell RRF 3.1.1 insists that external drivers must be 16 microsteps. I've changed the external drives and things work but particularly for the screw-driven Z axis there's no reason to have so much microstepping.
Is there a reason we're limited to 16 on external drivers?
Thanks.
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@markz
the microstepping on external drivers is ignored.you need to set the correct steps/mm for that microstepping
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So, the microstep value is only used to convert the steps / unit? Guess that makes sense. Thanks.
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if you change the micro stepping afterward, the firmware automatically adjusts the steps/mm
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Iirc dc42 said firmware does not adjust steps/mm with changes to microstepping for external drivers.
So just configure the external drivers to desired microstepping and then steps/mm to as you would for internal drivers
