CROSS_COMPILE = arm-none-eabi-

CC = $(CROSS_COMPILE)gcc
OBJCOPY = $(CROSS_COMPILE)objcopy

CFLAGS = -mcpu=cortex-m0 -mthumb -O -nostdlib -std=gnu99 -fno-toplevel-reorder

all: first.bin

first.elf: first.o
	$(CC) $(CFLAGS) -T flash.ld -o $@ $<

%.bin: %.elf
	$(OBJCOPY) -Obinary $< $@

clean:
	rm -f *.o *.elf *.bin