TOOLCHAIN = /opt/arm-toolchain

OPENOCD = /opt/arm-toolchain/openocd

AS = $(TOOLCHAIN)/bin/arm-elf-as
CC = $(TOOLCHAIN)/bin/arm-elf-gcc
LD = $(TOOLCHAIN)/bin/arm-elf-ld
NM = $(TOOLCHAIN)/bin/arm-elf-nm
SIZE = $(TOOLCHAIN)/bin/arm-elf-size
OBJCOPY = $(TOOLCHAIN)/bin/arm-elf-objcopy
OBJDUMP = $(TOOLCHAIN)/bin/arm-elf-objdump

INCDIRS = include $(TOOLCHAIN)/lib/gcc/arm-elf/4.1.1/include $(TOOLCHAIN)/arm-elf/include
LIBDIRS = $(TOOLCHAIN)/arm-elf/lib $(TOOLCHAIN)/lib/gcc/arm-elf/4.1.1

# ------

BUILD = build
TARGET = sam7fc

ASFLAGS = -mcpu=arm7tdmi -Wa,-adhlns=$(BUILD)/$(*D)/$(*F).lst,--gdwarf-2 -Iinclude

CFLAGS = -gdwarf-2 -mcpu=arm7tdmi -Os -std=gnu99
CFLAGS += -Wa,-adhlns=$(BUILD)/$(*D)/$(*F).lst
CFLAGS += -nostdinc $(patsubst %,-I%,$(INCDIRS))
CFLAGS += -MD -MP -MF $(BUILD)/$(*D)/$(*F).d

CFLAGS += -Wall
#CFLAGS += -Wextra
#CFLAGS += -Wcast-align -Wimplicit -Wunused
CFLAGS += -Wpointer-arith -Wswitch
CFLAGS += -Wredundant-decls -Wreturn-type -Wshadow
CFLAGS += -Wbad-function-cast -Wsign-compare -Waggregate-return
#CFLAGS += -Wcast-qual -Wnested-externs
#CFLAGS += -Wmissing-prototypes -Wmissing-declarations
CFLAGS += -Wstrict-prototypes 

LDFLAGS = -nostartfiles -t ldscript.ld -Wl,-Map=$@.map,--cref
LDFLAGS += $(patsubst %,-L%,$(LIBDIRS))
LDFLAGS += -lc -lgcc

# ------

SRC := $(wildcard *.c) $(wildcard src/*.c) $(wildcard src/*/*.c)
AS_SRC := $(wildcard *.s) $(wildcard src/*.s)

all: $(BUILD)/$(TARGET).elf
	@$(SIZE) -x $<

$(BUILD)/$(TARGET).elf: $(patsubst %,$(BUILD)/%,$(AS_SRC:.s=.o) $(SRC:.c=.o))
	@echo " Linking file:  $@"
	@$(shell mkdir -p $(BUILD)/$(*D))
	@$(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS) > /dev/null
	@$(OBJCOPY) -O binary $@ $@.bin
	@$(OBJCOPY) -O ihex $@ $@.hex
	@$(OBJDUMP) -h -S -C $@ > $@.lss
	@$(NM) -n $@ > $@.sym

$(BUILD)/%.o: %.c
	@echo " Building file: $<"
	@$(shell mkdir -p $(BUILD)/$(*D))
	@$(CC) -c $(CFLAGS) $< -o $@

$(BUILD)/%.o: %.s
	@echo " Building file: $<"
	@$(shell mkdir -p $(BUILD)/$(*D))
	@$(CC) -c $(ASFLAGS) $< -o $@

clean:
	rm -rf $(BUILD)

openocd:
	$(shell $(OPENOCD) -f scripts/openocd.cfg)

-include $(shell find $(BUILD) -name *.d 2> /dev/null)