MarlinFirmware/Marlin

[FR] button multiplexing

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#22,726 建立於 2021年9月7日

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 (6 留言) (2 反應) (0 負責人)C++ (16,011 star) (19,123 fork)batch import
C: User InterfaceT: Feature Requestgood first issue

描述

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

Button support has been added recently, but most motherboards don't have many pins free. Multiplexing will allow more buttons to be operated.

Are you looking for hardware support?

No response

Describe the feature you want

In the button configuration, I would like to be able to set the pins that support the buttons multiplexing. Like in the table below with pin names and button behaviour.

Screenshot_1

Additional context

No response

貢獻者指南

技術棧
cpp
領域
backend
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-2 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
C++ programminghardware multiplexing basicsMarlin firmware structure
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30
研究方向
Start by understanding the existing button configuration code in Marlin's 'Marlin/src/module/endstops.h' or similar files. Review how pins are currently assigned and how button events are handled. Then design a multiplexing scheme that allows multiple buttons to share pins through a matrix or multiplexer IC. Look at how Marlin handles other multiplexed inputs like thermistors for reference. Finally, implement the configuration options (e.g., pin names and behavior table) and update the documentation.