qmk_firmware/keyboards/atreus/rules.mk

ifdef TEENSY2
    OPT_DEFS += -DATREUS_TEENSY2
    ATREUS_UPLOAD_COMMAND = teensy_loader_cli -w -mmcu=$(MCU) $(TARGET).hex
else
    OPT_DEFS += -DATREUS_ASTAR
    ATREUS_UPLOAD_COMMAND = while [ ! -r $(USB) ]; do sleep 1; done; \
                            avrdude -p $(MCU) -c avr109 -U flash:w:$(TARGET).hex -P $(USB)
endif

# MCU name
#MCU = at90usb1287
MCU = atmega32u4

# Processor frequency.
#     This will define a symbol, F_CPU, in all source code files equal to the
#     processor frequency in Hz. You can then use this symbol in your source code to
#     calculate timings. Do NOT tack on a 'UL' at the end, this will be done
#     automatically to create a 32-bit value in your source code.
#
#     This will be an integer division of F_USB below, as it is sourced by
#     F_USB after it has run through any CPU prescalers. Note that this value
#     does not *change* the processor frequency - it should merely be updated to
#     reflect the processor speed set externally so that the code can use accurate
#     software delays.
F_CPU = 16000000

#
# LUFA specific
#
# Target architecture (see library "Board Types" documentation).
ARCH = AVR8

# Input clock frequency.
#     This will define a symbol, F_USB, in all source code files equal to the
#     input clock frequency (before any prescaling is performed) in Hz. This value may
#     differ from F_CPU if prescaling is used on the latter, and is required as the
#     raw input clock is fed directly to the PLL sections of the AVR for high speed
#     clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
#     at the end, this will be done automatically to create a 32-bit value in your
#     source code.
#
#     If no clock division is performed on the input clock inside the AVR (via the
#     CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
F_USB = $(F_CPU)

# Bootloader
#     This definition is optional, and if your keyboard supports multiple bootloaders of
#     different sizes, comment this out, and the correct address will be loaded 
#     automatically (+60). See bootloader.mk for all options.
ifdef TEENSY2
    BOOTLOADER = halfkay
else
    BOOTLOADER = caterina
endif

# Interrupt driven control endpoint task(+60)
OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT


# Build Options
#   comment out to disable the options.
#
#BOOTMAGIC_ENABLE = yes	# Virtual DIP switch configuration(+1000)
MOUSEKEY_ENABLE = yes	# Mouse keys(+4700)
EXTRAKEY_ENABLE = yes	# Audio control and System control(+450)
CONSOLE_ENABLE = yes	# Console for debug(+400)
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 = yes  # Breathing sleep LED during USB suspend
NKRO_ENABLE = yes		# USB Nkey Rollover - not yet supported in LUFA
# BACKLIGHT_ENABLE = yes  # Enable keyboard backlight functionality
# MIDI_ENABLE = YES 		# MIDI controls
UNICODE_ENABLE = YES 		# Unicode
# BLUETOOTH_ENABLE = yes # Enable Bluetooth with the Adafruit EZ-Key HID

USB = /dev/cu.usbmodem1411