AS := arm-none-eabi-as
CC := arm-none-eabi-gcc
OBJCOPY := arm-none-eabi-objcopy

OUTFILE := main.out
HEXFILE := $(subst .out,.hex,$(OUTFILE))

MCUFLAGS := -mthumb -mcpu=cortex-m4 #-mfloat-abi=hard -mfpu=fpv4-sp-d16
AFLAGS = $(MCUFLAGS) 
CFLAGS += $(MCUFLAGS) -ggdb -g3 -O0 \
         -I$(COMMON_DIR) -I$(COMMON_DIR)/cmsis \
         -fno-builtin -fsigned-char -ffreestanding \
         -Wall -Werror -Wextra -pedantic
LDFLAGS := -T $(COMMON_DIR)/link.ld -nostartfiles

CFILES += $(wildcard $(COMMON_DIR)/*.c) \
          $(wildcard $(COMMON_DIR)/*.s) 

OFILES := $(patsubst %.c, %.o, $(patsubst %.s, %.o, $(CFILES)))

.PHONY: all upload clean

all: $(OUTFILE)

upload: $(HEXFILE)
	@openocd -f interface/stlink.cfg -f target/stm32l4x.cfg \
	         -c "program $(HEXFILE) verify reset exit"

clean:
	@echo "  CLEAN"
	@rm -f $(OUTFILE) $(OFILES)

$(HEXFILE): $(OUTFILE)
	@echo "  OBJCOPY " $@
	@$(OBJCOPY) -O ihex $< $@

$(OUTFILE): $(OFILES)
	@echo "  CC      " $@
	@$(CC) $(CFLAGS) $(LDFLAGS) $(OFILES) -o $@

%.o: %.c
	@echo "  CC      " $<
	@$(CC) $(CFLAGS) -c $< -o $@

%.o: %.s
	@echo "  AS      " $<
	@$(AS) $(AFLAGS) -c $< -o $@