A5984/A4982 and APFD mode (Is ROSC grounded on a v1 smoothie?) Nebbian in the Delta forum has a theory that the "tree ring" patterning seen on delta printers might be due to the drivers missing a step at the transition from slow to mixed decay. [reprap.org] I was looking over the A5984 and A4982 datasheets, and they have a mode called "APFD" which is turned on by grounding ROSC. This should keep the driver in mixed decay. Based on the schematic on GitHub, Smoothie v1.1 boards don't ground ROSC. Is this correct? Did you guys ever experiment with that? https://reprap.org/forum/read.php?418,862093,862093#msg-862093 Wed, 12 Aug 2026 01:19:53 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?418,862093,869850#msg-869850 Re: A5984/A4982 and APFD mode (Is ROSC grounded on a v1 smoothie?) https://reprap.org/forum/read.php?418,862093,869850#msg-869850 arthurwolf Smoothie Wed, 01 Apr 2020 18:04:27 -0400 https://reprap.org/forum/read.php?418,862093,862093#msg-862093 A5984/A4982 and APFD mode (Is ROSC grounded on a v1 smoothie?) https://reprap.org/forum/read.php?418,862093,862093#msg-862093
[reprap.org]

I was looking over the A5984 and A4982 datasheets, and they have a mode called "APFD" which is turned on by grounding ROSC. This should keep the driver in mixed decay.

Based on the schematic on GitHub, Smoothie v1.1 boards don't ground ROSC. Is this correct?

Did you guys ever experiment with that?]]> aaronH Smoothie Thu, 07 Nov 2019 14:04:10 -0500