qmk_firmware/keyboards/jm60/rules.mk

# MCU name
MCU = STM32F103

MCU_LDSCRIPT = jm60_bootloader
BOARD = JM60_BOARD

# Build Options
#   comment out to disable the options.
#
BOOTMAGIC_ENABLE = yes	# Virtual DIP switch configuration
## (Note that for BOOTMAGIC on Teensy LC you have to use a custom .ld script.)
MOUSEKEY_ENABLE = no	# Mouse keys
EXTRAKEY_ENABLE = yes	# Audio control and System control
CONSOLE_ENABLE = no	# Console for debug
COMMAND_ENABLE = no    # Commands for debug and configuration
SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
NKRO_ENABLE = yes	    # USB Nkey Rollover
CUSTOM_MATRIX = yes # Custom matrix file
BACKLIGHT_ENABLE = no
VISUALIZER_ENABLE = no

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

# project specific files
SRC = matrix.c \
      led.c