# define the cpu used by the arduino due board
export CPU = sam3x8e

# 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.py

#define the flash-tool and default port depending on the host operating system
OS = $(shell uname)
ifeq ($(OS),Linux)
  PORT ?= /dev/ttyACM0
  FLASHER = stty -F $(PORT) raw ispeed 1200 ospeed 1200 cs8 -cstopb ignpar eol 255 eof 255; $(RIOTBOARD)/$(BOARD)/dist/bossac
else ifeq ($(OS),Darwin)
  PORT ?= $(shell ls -1 /dev/tty.usbmodem* | head -n 1)
  FLASHER = stty -f $(PORT) raw ispeed 1200 ospeed 1200 cs8 -cstopb ignpar eol 255 eof 255; $(RIOTBOARD)/$(BOARD)/dist/bossac_osx
else
  $(info CAUTION: No flash tool for your host system found!)
  # TODO: fix for building under windows
endif
export FLASHER
export PORT

# define build specific options
export CPU_USAGE = -mcpu=cortex-m3
export CFLAGS += -ggdb -g3 -std=gnu99 -Os -Wall -Wstrict-prototypes $(CPU_USAGE) -mlittle-endian -mthumb -mthumb-interwork -nostartfiles
export CFLAGS += -DREENTRANT_SYSCALLS_PROVIDED
export ASFLAGS += -ggdb -g3 -mcpu=cortex-m4 $(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 += -e -w -v -b bin/$(BOARD)/$(APPLICATION).hex

# additional compiler and linker flags to enable newlib-nano and optimize for it
# CAREFUL: newlib-nano is not supported by the ubuntu arm-none-eabi- toolchain, so its disabled by default
#export CFLAGS += -flto -ffunction-sections -fdata-sections -fno-builtin
#export LINKFLAGS += -specs=nano.specs -lc -lnosys


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