qmk/qmk_firmware

[Bug] Keychron C3 Pro ANSI RGB doesn't send keys when typing

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#25,581 opened on Aug 24, 2025

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bughelp wanted

Description

Describe the Bug

After compiling the firmware and flashing it onto the C3 Pro RGB, the lighting works perfectly, but when keys are pressed they do not get inputted. I know it isn't a hardware issue as keychron's official firmware for it works on my keyboard.

Keyboard Used

keychron/c3_pro/ansi/rgb

Link to product page (if applicable)

No response

Operating System

Windows

qmk doctor Output

qmk doctor
Ψ QMK Doctor is checking your environment.
Ψ CLI version: 1.1.8
Ψ QMK home: C:/Users/[name]/qmk_firmware
Ψ Detected Windows 10 (10.0.19045).
Ψ QMK MSYS version: 1.11.0
Ψ Userspace enabled: False
Ψ Git branch: master
Ψ Repo version: 0.29.12
Ψ - Latest master: 2025-08-06 21:15:03 +0100 (1a58fce043) -- Bump actions/download-artifact from 4
to 5 (#25545)
Ψ - Latest upstream/master: 2025-08-06 21:15:03 +0100 (1a58fce043) -- Bump actions/download-artifac t from 4 to 5 (#25545)
Ψ - Latest upstream/develop: None
Ψ - Common ancestor with upstream/master: 2025-08-06 21:15:03 +0100 (1a58fce043) -- Bump actions/do wnload-artifact from 4 to 5 (#25545)
Ψ - Common ancestor with upstream/develop: None
Ψ All dependencies are installed.
Ψ Found arm-none-eabi-gcc version 13.3.0
Ψ Successfully compiled using arm-none-eabi-gcc
Ψ Successfully tested arm-none-eabi-binutils using arm-none-eabi-size
Ψ Found avr-gcc version 15.1.0
Ψ Successfully compiled using avr-gcc
Ψ Successfully tested avr-binutils using avr-size
Ψ Found avrdude version 8.0-2025011
Ψ Found dfu-programmer version 1.1.0
Ψ Found dfu-util version 0.11
Ψ Submodules are up to date.
Ψ Submodule status:
Ψ - lib/chibios: 2025-05-15 08:25:11 +0000 --  (8bd61b8043)
Ψ - lib/chibios-contrib: 2025-01-08 21:03:31 +0100 --  (3ac181e4)
Ψ - lib/googletest: 2021-06-11 06:37:43 -0700 --  (e2239ee6)
Ψ - lib/lufa: 2022-08-26 12:09:55 +1000 --  (549b97320)
Ψ - lib/vusb: 2022-06-13 09:18:17 +1000 --  (819dbc1)
Ψ - lib/printf: 2022-06-29 23:59:58 +0300 --  (c2e3b4e)
Ψ - lib/pico-sdk: 2025-04-20 21:24:29 +1000 --  (d0c5cac)
Ψ - lib/lvgl: 2022-04-11 04:44:53 -0600 --  (e19410f8)
Ψ QMK is ready to go

Is AutoHotKey / Karabiner installed

  • AutoHotKey (Windows)
  • Karabiner (macOS)

Other keyboard-related software installed

No response

Additional Context

No response

Contributor guide

Tech stack
c
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C programmingQMK firmware basicsKeyboard matrix scanningFlashing firmware
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Review the QMK firmware configuration for the Keychron C3 Pro ANSI RGB keyboard (keyboards/keychron/c3 pro/ansi/rgb). Compare the matrix layout and keymap configuration with the official Keychron firmware. Check if the issue is related to incorrect USB endpoint configuration or missing key mapping in the info.json or config.h files. Use hid listen or similar debug tools to verify that keypress events are detected by the microcontroller.
[Bug] Keychron C3 Pro ANSI RGB doesn't send keys when typing · qmk/qmk_firmware#25581 | Good First Issue