qmk_firmware/keyboards/preonic/rev3/rules.mk

# MCU name
MCU = STM32F303
BOARD = QMK_PROTON_C

# Bootloader selection
BOOTLOADER = stm32-dfu

# Build Options
#   change to "no" to disable the options, or define them in the Makefile in
#   the appropriate keymap folder that will get included automatically
#
BOOTMAGIC_ENABLE = full      # Virtual DIP switch configuration
MOUSEKEY_ENABLE = yes      # Mouse keys
EXTRAKEY_ENABLE = yes       # Audio control and System control
CONSOLE_ENABLE = yes         # Console for debug
COMMAND_ENABLE = yes       # Commands for debug and configuration
NKRO_ENABLE = yes           # Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
MIDI_ENABLE = no            # MIDI controls
AUDIO_ENABLE = yes           # Audio output
UNICODE_ENABLE = no         # Unicode
BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
RGBLIGHT_ENABLE = yes        # Enable WS2812 RGB underlight.
WS2812_DRIVER = pwm
API_SYSEX_ENABLE = no

# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
#SLEEP_LED_ENABLE = yes

# Do not enable RGB_MATRIX_ENABLE together with RGBLIGHT_ENABLE
RGB_MATRIX_ENABLE = no
RGB_MATRIX_DRIVER = WS2812

ENCODER_ENABLE = yes
DIP_SWITCH_ENABLE = yes

LAYOUTS = ortho_5x12