## the cpu to build for
  export CPU = stm32f1
  export CPU_MODEL = stm32f103cb
  
  # the spark-core uses its own custom linkerscript...
  export LINKER_SCRIPT = stm32f103cb_sparkcore.ld
  
  # configure the serial interface
  PORT_LINUX ?= /dev/ttyUSB0
  PORT_DARWIN ?= $(firstword $(sort $(wildcard /dev/tty.SLAB_USBtoUART*)))
  include $(RIOTMAKE)/tools/serial.inc.mk
  
  export BINFILE = $(patsubst %.elf,%.bin,$(ELFFILE))
  
  export FLASHER = dfu-util
  export DEBUGGER = # spark core has no debugger
  export RESET = # dfu-util has no support for resetting the device
  
  export OFLAGS = -O binary
  export FFLAGS = -d 1d50:607f -a 0 -s 0x08005000:leave -D "$(HEXFILE)"
  
  export INCLUDES += -I$(RIOTCPU)/$(CPU)/include/ -I$(RIOTBOARD)/$(BOARD)/include/
  
  # this board uses openocd
  include $(RIOTMAKE)/tools/openocd.inc.mk