PREFIX ?= arm-none-eabi-

LDSCRIPT = support/stm32vl-discovery.ld

CFLAGS += -fno-common --function-sections -fdata-sections
LDFLAGS += -static -nostartfiles
LDFLAGS += -Wl,--gc-sections
LDFLAGS += -T ${LDSCRIPT}
LIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group

# Set up libopencm3.
OPENCM3_DIR ?= libopencm3
OPENCM3_LIBNAME = opencm3_stm32f1
CFLAGS += -I$(OPENCM3_DIR)/include
CFLAGS += -DSTM32F1 -msoft-float -mthumb -mcpu=cortex-m3 -mfix-cortex-m3-ldrd
LDFLAGS += -L$(OPENCM3_DIR)/lib
LIBS += -l$(OPENCM3_LIBNAME)

STLINK_PORT ?= :4242

obj-y += source/core/spi.o

$(OPENCM3_DIR)/lib/lib$(OPENCM3_LIBNAME).a:
	@if [ ! -e libopencm3/.git ]; then \
		git submodule init; \
		git submodule update; \
	fi
	@$(MAKE) -C $(OPENCM3_DIR)

$(BUILD)/tbm: $(OPENCM3_DIR)/lib/lib$(OPENCM3_LIBNAME).a

$(BUILD)/tbm.bin: $(BUILD)/tbm
	$(PREFIX)objcopy -Obinary $< $@

$(BUILD)/tbm.hex: $(BUILD)/tbm
	$(PREFIX)objcopy -Oihex $< $@

run: $(BUILD)/tbm
	@echo "GDB $<"
	@$(GDB) --batch \
		-ex 'target extended-remote $(STLINK_PORT)' \
		-x flash.scr \
		$<

flash: $(BUILD)/tbm.bin
	stm32flash -g 0x8000000 -w $< $(STM32_PORT)

openocd:
	openocd -f /usr/share/openocd/scripts/interface/jlink.cfg -c 'transport select swd' -f /usr/share/openocd/scripts/target/stm32f1x.cfg -c 'gdb_port 4242' -c 'telnet_port 4444'

.PHONY: run