MarlinFirmware/Marlin

[FR] Lerdge K add support to second Z driver as EX-AXIS

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#21,414 opened on Mar 22, 2021

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C: Boards/PinsT: Feature Requesthelp wanted

Description

Is your feature request related to a problem? Please describe.

Actually I have dual Z drivers and invidual Max Z homing sensors. On Lerdge original firmware it's possible using the Ex-Axis function as described in here: https://www.lerdge.com/document/detail/ExtensionOf-ExAxis

Are you looking for hardware support?

No response

Describe the feature you want

Would be nice if on Lerdge K Marlin firmware port one could choose to use Ex-Axis as: a) second individual step generator for Z axis (my setup) b) second step generator synchronized with steps on Z1 (some people use Ex-Axis like this)

This is a picture of my actual Ex-Axis configuration on Lerdge original firmware. Please, take this is consideration as it is the only thing attaching me to the Lerdge original firmware, which is awful. 9e262851-572c-4339-bfbb-6c0ec322d075

Contributor guide

Tech stack
cpp
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Marlin firmwarestepper motor controlC++Arduino platform
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Review Marlin's existing dual Z axis support (e.g., Z2 STEPPER PIN, Z2 DIR PIN) and understand how EX AXIS is implemented in Lerdge's firmware. Examine Configuration adv.h for relevant defines. Look at M350, M906, and other G code commands for stepper driver settings. Check the issue comments for any implementation discussions.