# define the cpu used by the arduino due board
export CPU = samd21
export CPU_MODEL = samr21g18a

# set the default port
export PORT ?= /dev/ttyACM0

# define tools used for building the project
export PREFIX = arm-none-eabi-
export CC = $(PREFIX)gcc
export AR = $(PREFIX)ar
export AS = $(PREFIX)as
export LINK = $(PREFIX)gcc
export SIZE = $(PREFIX)size
export OBJCOPY = $(PREFIX)objcopy
export TERMPROG = $(RIOTBASE)/dist/tools/pyterm/pyterm -p
export FLASHER = $(RIOTBOARD)/$(BOARD)/dist/flash.sh
export DEBUGGER = $(RIOTBOARD)/$(BOARD)/dist/debug.sh

# define build specific options
export CPU_USAGE = -mcpu=cortex-m0plus
FPU_USAGE =
export CFLAGS += -ggdb -g3 -std=gnu99 -O0 -Wall -Wstrict-prototypes $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -mthumb -mthumb-interwork -nostartfiles
export CFLAGS += -ffunction-sections -fdata-sections -fno-builtin
export ASFLAGS += -ggdb -g3 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian
export LINKFLAGS += -g3 -ggdb -std=gnu99 $(CPU_USAGE) $(FPU_USAGE) -mlittle-endian -static -lgcc -mthumb -mthumb-interwork -nostartfiles
# linkerscript specified in cpu/Makefile.include
export LINKFLAGS += -T$(LINKERSCRIPT)
export OFLAGS += -O binary
export FFLAGS += $(HEXFILE)
export TERMFLAGS += "$(PORT)"

# 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