keychron_qmk_firmware/keyboards/meira/rules.mk

# MCU name
MCU = atmega32u4

# Bootloader selection
#   Teensy       halfkay
#   Pro Micro    caterina
#   Atmel DFU    atmel-dfu
#   LUFA DFU     lufa-dfu
#   QMK DFU      qmk-dfu
#   ATmega32A    bootloadHID
#   ATmega328P   USBasp
BOOTLOADER = caterina

# Build Options
#   change yes to no to disable
#
BOOTMAGIC_ENABLE = no      # Virtual DIP switch configuration
MOUSEKEY_ENABLE = no       # Mouse keys
EXTRAKEY_ENABLE = yes       # Audio control and System control
CONSOLE_ENABLE = no        # Console for debug
COMMAND_ENABLE = no        # Commands for debug and configuration
# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
NKRO_ENABLE = no            # USB Nkey Rollover
MIDI_ENABLE = no            # MIDI support
UNICODE_ENABLE = no         # Unicode
BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
AUDIO_ENABLE = no           # Audio output on port C6
RGBLIGHT_ENABLE = no       # Enable WS2812 RGB underlight. 
FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
BACKLIGHT_CUSTOM_DRIVER = yes
BACKLIGHT_ENABLE = yes       # Enable keyboard backlight functionality, also set ISSI_ENABLE below for Miera
ISSI_ENABLE = yes			# If the I2C pullup resistors aren't install this must be disabled

CUSTOM_MATRIX = yes

#ifeq ($(strip $(ISSI_ENABLE)), yes)
#    TMK_COMMON_DEFS += -DISSI_ENABLE
#endif
#
#ifeq ($(strip $(WATCHDOG_ENABLE)), yes)
#    TMK_COMMON_DEFS += -DWATCHDOG_ENABLE
#endif
SRC += matrix.c TWIlib.c issi.c lighting.c

DEFAULT_FOLDER = meira/promicro
LAYOUTS = ortho_4x12