MarlinFirmware/Marlin

[FR] button multiplexing

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#22,726 opened on 2021年9月7日

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C: User InterfaceT: Feature Requestgood first issue

説明

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

コントリビューターガイド

技術スタック
cpp
領域
backend
Issue 種別
feature
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
3
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
1-2 days
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
C++ programminghardware multiplexing basicsMarlin firmware structure
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
30
調査方針
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.