This repository contains my custom QMK keymap for the Corne (crkbd) split keyboard. It includes advanced features like Key Overrides, Combos, and RGB Matrix controls for a highly ergonomic and customizable experience.

At a glance, the layout keeps QWERTY on the base layer, places punctuation on Lower (MO(1)), navigation and numbers on Raise (MO(2)), and parks RGB controls on MO(3), while the Meta thumb key acts as GUI (Windows/Command key). Signature combos include Shift+Backspace sending Delete, Shift+| outputting ?, and the Lower+Raise+Esc chord that toggles the Meta key between GUI and Shift for gaming mode.

• Meta: Left GUI (Windows/Command) key on the thumb; toggles to Shift in gaming mode
• Lower / Raise: Momentary layer switches MO(1) / MO(2)
• RGB: Thumb key that holds MO(3) for lighting controls
• Ctrl+Space: Tmux prefix
• Shift+PrtSc: S(KC_PSCR) for full-screen screenshots
• RM_ keycodes*: RGB Matrix helpers for mode, hue, saturation, value, and speed adjustments
• Empty: Deliberately transparent slot that falls through to lower layers

• Key Overrides
  • Shift+| = ?
  • Shift+Bksp = Delete
• Gaming Mode Toggle
  • Press Lower+Raise+Esc to toggle the Meta (GUI) thumb key between Windows/Command key (normal) and Shift (gaming mode).
  • In gaming mode, the Meta key becomes Shift to prevent accidentally opening the Start menu.
• RGB Matrix Controls
  • Layer 3 provides RGB toggle, mode, hue, saturation, brightness, speed adjustments.
• Layer Layouts
  • Base: QWERTY
  • Layer 1: Symbols
  • Layer 2: Numbers + Navigation
  • Layer 3: RGB + Function keys

• Install the QMK CLI and toolchains via qmk setup using the official getting-started guide.
• Make sure AVR GCC, dfu-programmer, and (if needed) dfu-util are on your PATH.
• Run qmk doctor to verify your environment before flashing.

1. Clone QMK Firmware.
2. Clone this keymap.

Place this repo under:

<qmk repo root>/keyboards/crkbd/keymaps/freddiehaddad

qmk config user.keyboard=crkbd
qmk config user.keymap=freddiehaddad
qmk compile --clean
qmk flash --bootloader dfu

• Connect each half of the Corne when prompted during flashing.
• If the board fails to enter bootloader, hold the reset button and rerun the flash command, then check qmk doctor for warnings.

NOTE: If initial flash fails:

See: Github Issue

dfu-programmer atmega32u4 erase --force

qmk c2json --keyboard crkbd/rev1 --keymap freddiehaddad --output keymap.json keymap.c

• SVG layouts live in assets/ and mirror each QMK layer.
• Update the keycaps and labels whenever keymap.c changes so the README stays accurate.
• If you export PNGs or other variants, regenerate them from the SVG source to keep everything in sync.

• QMK Docs
• RGB Matrix
• Combos
• Key Overrides
• QMK Configurator