qmk/qmk_firmware

[Feature Request] Ability to make keyboard LEDs light up when the `FLOW_TAP_TERM` has passed

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#25,982 opened on Jan 30, 2026

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enhancementhelp wantedstale

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Description

Feature Request Type

  • Core functionality
  • Add-on hardware support (eg. audio, RGB, OLED screen, etc.)
  • Alteration (enhancement/optimization) of existing feature(s)
  • New behavior

Description

I defined FLOW_TAP_TERM as 200, which makes it so that if I tapped a key 200 ms prior, any key press of a tap-hold key is treated as a tap. It would be very useful if there was a feature that allows you to light up the keyboard’s LEDs/RGB immediately when flow tap is no longer active, so that I know exactly when I can use tap-hold keys again. This would be especially useful when switching between fast typing and using keyboard shortcuts, for example in a text editor. I don’t know if this is currently possible by defining a function in keymap.c, but based on the tap-hold documentation I don’t think it is.

Contributor guide

Research direction
Investigate QMK's quantum/tap hold.c and LED/RGB matrix API to implement a callback when FLOW TAP TERM expires.
Tech stack
c
Domain
None
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65