qmk_firmware/keyboards/keebio/bdn9/rev2/rules.mk

# MCU name
MCU = STM32F072

# Bootloader selection
BOOTLOADER = stm32-dfu

# Build Options
#   change yes to no to disable
#
BOOTMAGIC_ENABLE = lite     # 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
# 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
BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
MIDI_ENABLE = no            # MIDI support
BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
AUDIO_ENABLE = no           # Audio output on port C6
ENCODER_ENABLE = yes
RGB_MATRIX_ENABLE = yes
RGB_MATRIX_DRIVER = WS2812

# Enter lower-power sleep mode when on the ChibiOS idle thread
OPT_DEFS += -DCORTEX_ENABLE_WFI_IDLE=TRUE