qmk_firmware_custom/keyboards/handwired/datahand/rules.mk

# Project-specific includes
SRC = matrix.c

# MCU name
MCU = at90usb1286

# 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)

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

BOOTLOADER = halfkay

# Build Options
BOOTMAGIC_ENABLE  = no   # 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
NKRO_ENABLE       = yes  # USB Nkey Rollover
BACKLIGHT_ENABLE  = no   # Enable keyboard backlight functionality on B7 by default
MIDI_ENABLE       = no   # MIDI controls
UNICODE_ENABLE    = no   # Unicode
BLUETOOTH_ENABLE  = no   # Enable Bluetooth with the Adafruit EZ-Key HID
AUDIO_ENABLE      = no   # Audio output on port C6
CUSTOM_MATRIX     = yes  # We definitely have a nonstandard matrix

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