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qmk_firmware/docs/feature_bootmagic.md

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Bootmagic and Magic Keycodes

There are 3 separate but related features that allow you to change the behavior of your keyboard without reflashing. While each of them have similar functionality you access that functionality in different ways depending on how your keyboard is configured.

Bootmagic is a system for configuring your keyboard while it initializes. To trigger a Bootmagic command you hold down the bootmagic key (KC_SPACE on most keyboards) and one or more command keys.

Bootmagic Keycodes allow you to access the Bootmagic functionality after your keyboard has initialized. To use Bootmagic Keycodes you assign keycodes starting with MAGIC_, much in the same way you define any other key.

Command is a feature that allows you to control different aspects of your keyboard. Command used to be called Magic. Command is typically accessed by holding Left and Right Shift at the same time, although that can be customized. While it shares some functionality with Bootmagic it also allows you to access functionality that Bootmagic does not. For more information see the (Command)[feature_command.md) documentation page.

Enabling Bootmagic

Bootmagic is disabled by default. To use Bootmagic you need to enable it in your rules.mk file:

BOOTMAGIC_ENABLE = yes

Bootmagic Hotkeys and Keycodes

This table describes the default Hotkeys for Bootmagic and the Keycodes for Magic. These may be overriden at the Keyboard or Keymap level. Some functionality is not available in both methods.

To use the Hotkey hold down BOOTMAGIC_KEY_SALT (KC_SPACE by default) and the Hotkey while plugging in your keyboard. To use the Keycode assign that keycode to a layer. For example, if you hold down Space+B while plugging in most keyboards, you will enter bootloader mode.

Hotkey Keycode Description
ESC Skip bootmagic and saved eeprom configuration
B RESET Enter bootloader instead of firmware
D DEBUG Enable debugging (writes messages to serial)
X Enable matrix debugging
K Enable keyboard debugging
M Enable mouse debugging
BACKSPACE Clear the saved settings from flash
CAPSLOCK MAGIC_CAPSLOCK_TO_CONTROL Treat Capslock as Control
MAGIC_UNCAPSLOCK_TO_CONTROL Stop treating CapsLock as Control
LCTRL MAGIC_SWAP_CONTROL_CAPSLOCK Swap Control and Capslock
MAGIC_UNSWAP_CONTROL_CAPSLOCK Unswap Left Control and Caps Lock
MAGIC_SWAP_ALT_GUI Swap Alt and GUI on both sides
MAGIC_UNSWAP_ALT_GUI Unswap Left Alt and GUI
LALT MAGIC_SWAP_LALT_LGUI Swap Left Alt and GUI, e.g. for OSX Opt and Cmd
MAGIC_UNSWAP_LALT_LGUI Unswap Left Alt and GUI
RALT MAGIC_SWAP_RALT_RGUI Swap Right Alt and GUI
MAGIC_UNSWAP_RALT_RGUI Unswap Right Alt and GUI
LGUI MAGIC_NO_GUI Disable GUI key - e.g. disable Windows key during gaming
MAGIC_UNNO_GUI Enable the GUI key
GRAVE MAGIC_SWAP_GRAVE_ESC Swap \~andESC`
MAGIC_UNSWAP_GRAVE_ESC Unswap \~` and Escape
BACKSLASH MAGIC_SWAP_BACKSLASH_BACKSPACE Swap Blackslash and Backspace
MAGIC_UNSWAP_BACKSLASH_BACKSPACE Unswap Backslash and Backspace
N MAGIC_HOST_NKRO Force N-Key Rollover (NKRO) on
MAGIC_UNHOST_NKRO Force NKRO off
MAGIC_TOGGLE_NKRO Toggle NKRO on or off
0 DF(0) Make Layer 0 the default layer at bootup
1 DF(1) Make Layer 1 the default layer at bootup
2 DF(2) Make Layer 2 the default layer at bootup
3 DF(3) Make Layer 3 the default layer at bootup
4 DF(4) Make Layer 4 the default layer at bootup
5 DF(5) Make Layer 5 the default layer at bootup
6 DF(6) Make Layer 6 the default layer at bootup
7 DF(7) Make Layer 7 the default layer at bootup

Bootmagic Configuration

When setting up your keyboard and/or keymap there are a number of #defines that control the behavior of Bootmagic. To use these put them in your config.h, either at the keyboard or keymap level.

Define Default Description
BOOTMAGIC_KEY_SALT KC_SPACE The key to hold down to trigger Bootmagic during initialization.
BOOTMAGIC_KEY_SKIP KC_ESC The Hotkey to ignore saved eeprom configuration.
BOOTMAGIC_KEY_EEPROM_CLEAR KC_BSPACE The hotkey to clear the saved eeprom configuration.
BOOTMAGIC_KEY_BOOTLOADER KC_B The hotkey to enter the bootloader.
BOOTMAGIC_KEY_DEBUG_ENABLE KC_D The hotkey to enable debug mode.
BOOTMAGIC_KEY_DEBUG_MATRIX KC_X The hotkey to enable matrix debugging mode.
BOOTMAGIC_KEY_DEBUG_KEYBOARD KC_K The hotkey to enable keyboard debugging mode.
BOOTMAGIC_KEY_DEBUG_MOUSE KC_M The hotkey to enable mouse debugging mode.
BOOTMAGIC_KEY_SWAP_CONTROL_CAPSLOCK KC_LCTRL
BOOTMAGIC_KEY_CAPSLOCK_TO_CONTROL KC_CAPSLOCK
BOOTMAGIC_KEY_SWAP_LALT_LGUI KC_LALT
BOOTMAGIC_KEY_SWAP_RALT_RGUI KC_RALT
BOOTMAGIC_KEY_NO_GUI KC_LGUI
BOOTMAGIC_KEY_SWAP_GRAVE_ESC KC_GRAVE
BOOTMAGIC_KEY_SWAP_BACKSLASH_BACKSPACE KC_BSLASH
BOOTMAGIC_HOST_NKRO KC_N
BOOTMAGIC_KEY_DEFAULT_LAYER_0 KC_0 Hotkey to set Layer 0 as the default layer
BOOTMAGIC_KEY_DEFAULT_LAYER_1 KC_1 Hotkey to set Layer 1 as the default layer
BOOTMAGIC_KEY_DEFAULT_LAYER_2 KC_2 Hotkey to set Layer 2 as the default layer
BOOTMAGIC_KEY_DEFAULT_LAYER_3 KC_3 Hotkey to set Layer 3 as the default layer
BOOTMAGIC_KEY_DEFAULT_LAYER_4 KC_4 Hotkey to set Layer 4 as the default layer
BOOTMAGIC_KEY_DEFAULT_LAYER_5 KC_5 Hotkey to set Layer 5 as the default layer
BOOTMAGIC_KEY_DEFAULT_LAYER_6 KC_6 Hotkey to set Layer 6 as the default layer
BOOTMAGIC_KEY_DEFAULT_LAYER_7 KC_7 Hotkey to set Layer 7 as the default layer