# define the cpu used by the arduino mega2560 board
export CPU = atmega2560

# define tools used for building the project
export PREFIX = avr-
export CC = $(PREFIX)gcc
export CXX = $(PREFIX)c++
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
export TERMFLAGS = -b 9600 -p $(PORT)

#define the flash-tool and default port depending on the host operating system
OS = $(shell uname)
ifeq ($(OS),Linux)
  PORT ?= /dev/ttyACM0
  FLASHER = avrdude
#else ifeq ($(OS),Darwin)
#  PORT ?=
#  FLASHER =
else
  $(info CAUTION: No flash tool for your host system found!)
  # TODO: fix for building under windows/MacOS
endif
export FLASHER
export PORT
export DIST_PATH = $(RIOTBOARD)/$(BOARD)/dist
export DEBUGSERVER_PORT = 4242
export DEBUGSERVER = $(DIST_PATH)/debug_srv.sh
export DEBUGSERVER_FLAGS = "-g -j usb :$(DEBUGSERVER_PORT)"
export DEBUGGER_FLAGS = "-x $(RIOTBOARD)/$(BOARD)/dist/gdb.conf $(ELFFILE)"
export DEBUGGER = $(DIST_PATH)/debug.sh $(DEBUGSERVER_FLAGS) $(DIST_PATH) $(DEBUGSERVER_PORT)

# PROGRAMMER defaults to stk500v2 which is the internal flasher via USB. Can be
# overridden for debugging (which requires changes that require to use an ISP)
export PROGRAMMER ?= stk500v2

ifeq ($(PROGRAMMER), stk500v2)
    export PROGRAMMER_FLAGS = -P $(PORT) -b 115200
endif

# define build specific options
export CFLAGS_CPU   = -mmcu=atmega2560  $(CFLAGS_FPU)
export CFLAGS_LINK  = -ffunction-sections -fdata-sections -fno-builtin -fshort-enums
export CFLAGS_DBG   = -ggdb -g3
export CFLAGS_OPT  ?= -Os

export CFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT)
export ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG)
export LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) -static -lgcc -e reset_handler
export OFLAGS += -j .text -j .data -O ihex
export FFLAGS += -p m2560 -c $(PROGRAMMER) $(PROGRAMMER_FLAGS) -F -U flash:w:bin/$(BOARD)/$(PROJECT)$(APPLICATION).hex