## the cpu to build for
  export CPU = stm32l1
  export CPU_MODEL = stm32l151rc
  
  # define the default port depending on the host OS
  PORT_LINUX ?= /dev/ttyUSB0
  PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.SLAB_USBtoUART*)))
  
  # set the default id
  export ID ?= 0483:df11
  
  export BINFILE = $(patsubst %.elf,%.bin,$(ELFFILE))
  
  export FLASHER = dfu-util
  export DEBUGGER = # dfu-util has no debugger
  export RESET = # dfu-util has no support for resetting the device
  
  export OFLAGS = -O binary
  export FFLAGS = -d $(ID) -a 0 -s 0x08000000:leave -D "$(HEXFILE)"
  export TERMFLAGS = -p $(PORT)
  
  export INCLUDES += -I$(RIOTCPU)/$(CPU)/include/ -I$(RIOTBOARD)/$(BOARD)/include/
  
  # setup serial terminal
  include $(RIOTMAKE)/tools/serial.inc.mk