qmk_firmware/keyboards/crkbd/keymaps/mcrown/rules.mk

# 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
#
MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
EXTRAKEY_ENABLE = no        # Audio control and System control(+450)
RGB_MATRIX_ENABLE = yes     # Enable RGB Matrix. 
OLED_DRIVER_ENABLE = yes

# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
SLEEP_LED_ENABLE = yes    # Breathing sleep LED during USB suspend

# If you want to change the display of OLED, you need to change here
SRC +=  ./lib/rgb_state_reader.c \
        ./lib/layer_state_reader.c \
        ./lib/logo_reader.c \
        ./oled.c\