qmk_firmware/keyboards/xd84/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 = atmel-dfu

# Build Options
#   change yes to no to disable
#
BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration(+1000)
MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
CONSOLE_ENABLE = no         # Console for debug(+400)
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
BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality on B7 by default
RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
MIDI_ENABLE = no            # MIDI support (+2400 to 4200, depending on config)
UNICODE_ENABLE = no         # Unicode
BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
AUDIO_ENABLE = no           # Audio output on port C6
FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
HD44780_ENABLE = no         # Enable support for HD44780 based LCDs (+400)
LINK_TIME_OPTIMIZATION_ENABLE = yes

# custom matrix setup
CUSTOM_MATRIX = lite

VPATH += drivers/gpio
SRC += pca9555.c matrix.c
QUANTUM_LIB_SRC += i2c_master.c

LAYOUTS = 75_ansi 75_iso