DEVICE?=stm32f446
CPU?=cortex-m4

APP=blink.elf

BINDIR=bin
SRCDIR=src
INCDIR=include
OBJDIR=obj

DEVICEDIR=devices/$(DEVICE)
GENERALDIR=devices/general

PROJSRCS=$(wildcard $(SRCDIR)/*.c)
GENERALSRCS=$(wildcard $(GENERALDIR)/*.c)
DEVICESRCS=$(wildcard $(DEVICEDIR)/*.c)

SRCS=$(PROJSRCS) $(GENERALSRCS) $(DEVICESRCS)
OBJS=$(patsubst %.c,obj/%.o,$(SRCS))

CFLAGS=-I$(INCDIR) -I$(DEVICEDIR)/$(INCDIR) -mthumb -mcpu=$(CPU) -nostdlib
LDFLAGS=-T$(DEVICEDIR)/linker_script.ld -nostdlib

CC=arm-none-eabi-gcc
LD=arm-none-eabi-ld
OPENOCD=openocd

$(BINDIR)/$(APP): $(OBJS)
	mkdir -p $(BINDIR)
	$(LD) $^ -o $@ $(LDFLAGS)

$(OBJDIR)/src/%.o: $(SRCDIR)/%.c
	mkdir -p "$(OBJDIR)/src"
	$(CC) -c $< -o $@ $(CFLAGS)

$(OBJDIR)/$(DEVICEDIR)/%.o: $(DEVICEDIR)/%.c
	mkdir -p "$(OBJDIR)/$(DEVICEDIR)"
	$(CC) -c $< -o $@ $(CFLAGS)

$(OBJDIR)/$(GENERALDIR)/%.o: $(GENERALDIR)/%.c
	mkdir -p "$(OBJDIR)/$(GENERALDIR)"
	$(CC) -c $< -o $@ $(CFLAGS)

.PHONY: openocd flash clean
openocd:
	$(OPENOCD) -f interface/stlink.cfg -f target/stm32f4x.cfg

flash: $(BINDIR)/$(APP)
	$(OPENOCD) -f interface/stlink.cfg -f target/stm32f4x.cfg -c "program $(BINDIR)/$(APP) verify reset exit"

clean:
	rm -rf $(OBJDIR) $(BINDIR)