# Settings
GDB      ?= arm-none-eabi-gdb
GAS      ?= arm-none-eabi-as
GCC      ?= arm-none-eabi-gcc
GXX      ?= arm-none-eabi-g++
GLD      ?= arm-none-eabi-gcc
OBJCOPY  ?= arm-none-eabi-objcopy

CFLAGS   ?= -Wall -g --std=gnu99
CXXFLAGS ?= -Wall -g --std=gnu++98

# Cross compiler flags
CPPFLAGS += -I$(MBED) -I$(MBED)/TARGET_KL46Z

CFLAGS   += -mthumb -mcpu=cortex-m0plus
CXXFLAGS += -mthumb -mcpu=cortex-m0plus -fno-exceptions

LDFLAGS  += --specs=nano.specs -Wl,-u_printf_float -Wl,--gc-sections \
            -T$(MBED)/TARGET_KL46Z/TOOLCHAIN_GCC_ARM/MKL46Z4.ld \
            -L$(MBED)/TARGET_KL46Z/TOOLCHAIN_GCC_ARM \
            $(MBED)/TARGET_KL46Z/TOOLCHAIN_GCC_ARM/cmsis_nvic.o \
            $(MBED)/TARGET_KL46Z/TOOLCHAIN_GCC_ARM/retarget.o \
            $(MBED)/TARGET_KL46Z/TOOLCHAIN_GCC_ARM/startup_MKL46Z4.o \
            $(MBED)/TARGET_KL46Z/TOOLCHAIN_GCC_ARM/system_MKL46Z4.o \
            -Wl,--start-group -lmbed -lc_s -lstdc++_s -Wl,--end-group

# Targets
all: $(PROG).bin

info: all
	@echo "LS   $(PROG).bin $(PROG).elf"
	@ls -lh $(PROG).bin $(PROG).elf

install: all
	@echo "INST $(PROG).bin"
	@if [ -b /dev/sdb ]; then         \
		mount /mnt/usb;           \
		cp $(PROG).bin /mnt/usb;  \
		umount /mnt/usb;          \
	else                              \
		echo Error: No USB found; \
	fi

gdb: all
	$(GDB) -ex 'target remote localhost:3333' $(PROG).elf

openocd: all
	openocd -c 'adapter_khz 5000'         \
	        -c 'gdb_memory_map disable'   \
	        -s /usr/share/openocd/scripts \
	        -f board/frdm-kl46z.cfg

clean:
	@echo "RM   $(PROG).bin $(PROG).elf $(OBJS)"
	@rm -f $(PROG).bin $(PROG).elf $(OBJS)

# Rules
%.o: %.c $(wildcard *.h) makefile ../common.mk ../config.mk
	@echo "CC   $<"
	@$(GCC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<

%.o: %.cc $(wildcard *.h) makefile ../common.mk ../config.mk
	@echo "CXX  $<"
	@$(GXX) $(CXXFLAGS) $(CPPFLAGS) -c -o $@ $<

%.o: %.cpp $(wildcard *.h) makefile ../common.mk ../config.mk
	@echo "CXX  $<"
	@$(GXX) $(CXXFLAGS) $(CPPFLAGS) -c -o $@ $<

$(PROG).elf: $(OBJS)
	@echo "LD   $+"
	@$(GLD) $(CFLAGS) -o $@ $^ $(LDFLAGS)

$(PROG).bin: $(PROG).elf
	@echo "BIN  $+"
	@$(OBJCOPY) -O binary $< $@