## the cpu to build for
export CPU = stm32l1
export CPU_MODEL = stm32l152ret6

#define the default port depending on the host OS
OS := $(shell uname)
ifeq ($(OS),Linux)
  PORT ?= /dev/ttyACM0
else ifeq ($(OS),Darwin)
  PORT ?= $(shell ls -1 /dev/tty.SLAB_USBtoUART* | head -n 1)
else
  $(info CAUTION: No flash tool for your host system found!)
  # TODO: add support for windows as host platform
endif
export PORT

# define tools used for building the project
export PREFIX = arm-none-eabi-
export CC = $(PREFIX)gcc
export CXX = $(PREFIX)g++
export AR = $(PREFIX)ar
export AS = $(PREFIX)as
export LINK = $(PREFIX)gcc
export SIZE = $(PREFIX)size
export OBJCOPY = $(PREFIX)objcopy
export DBG = $(PREFIX)gdb
export TERMPROG = $(RIOTBASE)/dist/tools/pyterm/pyterm
export FLASHER = $(RIOTBASE)/dist/tools/openocd/openocd.sh
export DEBUGGER = $(RIOTBASE)/dist/tools/openocd/openocd.sh
export DEBUGSERVER = $(RIOTBASE)/dist/tools/openocd/openocd.sh
export RESET = $(RIOTBASE)/dist/tools/openocd/openocd.sh

# unwanted (CXXUWFLAGS) and extra (CXXEXFLAGS) flags for c++
export CXXUWFLAGS +=
export CXXEXFLAGS +=

# define build specific options
export CPU_USAGE = -mcpu=cortex-m3
export FPU_USAGE =
export CFLAGS += -ggdb -g3 -std=gnu99 -Os -Wall -Wstrict-prototypes $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -mthumb -mno-thumb-interwork -nostartfiles
export CFLAGS += -ffunction-sections -fdata-sections -fno-builtin
export ASFLAGS += -ggdb -g3 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian
export LINKFLAGS += -ggdb -g3 -std=gnu99 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -static -lgcc -mthumb -mno-thumb-interwork -nostartfiles
# $(LINKERSCRIPT) is specified in cpu/Makefile.include
export LINKFLAGS += -T$(LINKERSCRIPT)
export OFLAGS = -O ihex
export TERMFLAGS += -p "$(PORT)"
export FFLAGS = flash
export DEBUGGER_FLAGS = debug
export DEBUGSERVER_FLAGS = debug-server
export RESET_FLAGS = reset

# use the nano-specs of the NewLib when available
ifeq ($(shell $(LINK) -specs=nano.specs -E - 2>/dev/null >/dev/null </dev/null ; echo $$?),0)
export LINKFLAGS += -specs=nano.specs -lc -lnosys
endif

# export board specific includes to the global includes-listing
export INCLUDES += -I$(RIOTBOARD)/$(BOARD)/include/