Linear Advance may now be possible via TMC2208 fix backport

[dimiras]

Your README explains why Linear Advance was left disabled — the TMC2208 stall issue and the failed attempt to merge MarlinFirmware/Marlin#24533.
I came across @CloudedQuartz's fork which appears to have solved this. They backported the TMC2208 LA fix directly into the stepper/planner code and enabled Linear Advance, across these 3 commits:

3a50c1e — backport TMC2208 linear advance fix
d183598 — enable Linear Advance in Configuration_adv.h
af8c425 — HC32F460 clock fix in stepper.cpp

I have a Kobra Neo and would be happy to test a build if you decide to look into it.

[NuclearPhoenixx]

Hi there, it's been quite a long time, and I'm not even sure if I have the compiler anymore to create new binaries to be honest :D

Did you give it a try with the fork? Looks like it's the same repo, other than that improvement, so it should be comparable. Or did you not try because you need the binary?

[dimiras]

I didn't try it because the fork is 20 commits ahead of yours and not all of them are related to Linear Advance. There are motion tuning changes, probe config reverts, StealthChop disabled, and a few other things. I wasn't comfortable testing something with that many differences at once.

The fork is also 2 commits behind yours, though looking at those they are just a README update and a FUNDING.yml, so nothing firmware related.

Ideally I'd want a build as close as possible to yours with just the LA fix applied. If you don't have the compiler set up anymore, no worries. I just wanted to flag that the CloudedQuartz fork isn't a clean isolated test for the LA fix.

[NuclearPhoenixx]

Ah okay, I see, well thanks for pointing this out. I'll try to get a new bin file with the 3 commits you mentioned.

[NuclearPhoenixx]

Ok, so I tried grabbing all the chances from the 3 commits, gave the compiler a go, and got this bin file:

firmware.zip

The changes are in this new branch: https://github.com/NuclearPhoenixx/Kobra_Neo/tree/linear-adv-test

Let me know how it works out for you.

[dimiras]

Hi, I will install it and test thanks!