PROJECT = main
LOCAL_SOURCE_DIR = src
LOCAL_LIBS = 
BUILD_DIR = build

CUBE_DIR := /opt/stm32cube/STM32Cube_FW_F0_V1.6.0
DEBUG := no

CUBE_DEVICE = STM32F0xx
H_DEVICE = STM32F030x6
STARTUP_SOURCE_DIR = $(CUBE_DIR)/Drivers/CMSIS/Device/ST/$(CUBE_DEVICE)/Source/Templates/gcc

LOCAL_SOURCES = $(wildcard $(LOCAL_SOURCE_DIR)/*.c)
LOCAL_LIB_SOURCES = $(foreach dir,$(LOCAL_LIBS),$(wildcard $(dir)/*.c))
STARTUP_SOURCES = $(STARTUP_SOURCE_DIR)/startup_stm32f030x6.s

ifeq ($(DEBUG),yes)
DEBUG_FLAGS = -DDEBUG -g3
endif

BUILD_NUMBER_FILE = build-number.txt
BUILD_ID_FLAGS = -Xlinker --defsym -Xlinker __BUILD_DATE=$$(date +'%Y%m%d') \
				 -Xlinker --defsym -Xlinker __BUILD_NUMBER=$$(cat $(BUILD_NUMBER_FILE))

CURRENT_BUILD_CONFIG := $(shell cat makefile | md5sum) DEBUG = $(DEBUG) CUBE_DIR = $(CUBE_DIR)
LAST_BUILD_CONFIG := $(shell cat $(BUILD_DIR)/build-config.txt)

CFLAGS = -mcpu=cortex-m0 -mlittle-endian -mthumb -mthumb-interwork -mfloat-abi=soft -Os \
		 -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -mlong-calls \
		 -Wall -Xlinker --gc-sections -I$(CUBE_DIR)/Drivers/CMSIS/Include \
		 -I$(CUBE_DIR)/Drivers/CMSIS/Device/ST/$(CUBE_DEVICE)/Include -D$(H_DEVICE) \
		 -Tld/stm32f030f4_flash.ld -Wl,-Map=$(BUILD_DIR)/$(PROJECT).map -std=c99 \
		 $(addprefix -I,$(LOCAL_LIBS)) $(DEBUG_FLAGS)

RM = rm -f
CC = arm-none-eabi-gcc
OBJCOPY = arm-none-eabi-objcopy
SIZE = arm-none-eabi-size
OBJDUMP = arm-none-eabi-objdump

LOCAL_OBJECTS = $(patsubst $(LOCAL_SOURCE_DIR)/%.c, $(BUILD_DIR)/%.o, $(LOCAL_SOURCES))
LOCAL_LIB_OBJECTS = $(addprefix $(BUILD_DIR)/,$(addsuffix .o,$(basename $(notdir $(LOCAL_LIB_SOURCES)))))
STARTUP_OBJECTS = $(patsubst $(STARTUP_SOURCE_DIR)/%.s, $(BUILD_DIR)/%.o, $(STARTUP_SOURCES))
OBJECTS = $(LOCAL_OBJECTS) $(LOCAL_LIB_OBJECTS) $(STARTUP_OBJECTS)
LOCAL_DEPENDS = $(patsubst $(LOCAL_SOURCE_DIR)/%.c, $(BUILD_DIR)/%.d, $(LOCAL_SOURCES))

.DEFAULT_GOAL = all
.DELETE_ON_ERROR:

$(LOCAL_OBJECTS): $(BUILD_DIR)/%.o: $(LOCAL_SOURCE_DIR)/%.c
	$(CC) $< -c -o $@ $(CFLAGS)

define define_lib_compile_rules
$(LOCAL_LIB_OBJECTS): $(BUILD_DIR)/%.o: $(1)/%.c
	$$(CC) $$(CFLAGS) -o $$@ -c $$<
endef

$(foreach directory,$(LOCAL_LIBS),$(eval $(call define_lib_compile_rules,$(directory))))

$(STARTUP_OBJECTS): $(BUILD_DIR)/%.o: $(STARTUP_SOURCE_DIR)/%.s
	$(CC) $< -c -o $@ $(CFLAGS)

$(LOCAL_DEPENDS): $(BUILD_DIR)/%.d: $(LOCAL_SOURCE_DIR)/%.c
	@set -e; rm -f $@; $(CC) -MM $(CFLAGS) $< > $@.$$$$; sed 's,\($*\)\.o[ :]*,build\/\1.o $@ : ,g' < $@.$$$$ > $@; rm -f $@.$$$$

include $(LOCAL_DEPENDS) 

$(BUILD_DIR)/$(PROJECT).elf: $(OBJECTS) $(BUILD_NUMBER_FILE)
	$(CC) $(OBJECTS) $(CFLAGS) $(BUILD_ID_FLAGS) -o $@

$(BUILD_DIR)/$(PROJECT).bin: $(BUILD_DIR)/$(PROJECT).elf
	$(OBJCOPY) -O binary -S $< $@

$(BUILD_DIR):
	if [ ! -d "$(BUILD_DIR)" ]; then mkdir "$(BUILD_DIR)"; fi

$(BUILD_NUMBER_FILE): $(OBJECTS)
	@if ! test -f $(BUILD_NUMBER_FILE); then echo 0 > $(BUILD_NUMBER_FILE); else \
	echo $$(($$(cat $(BUILD_NUMBER_FILE)) + 1)) > $(BUILD_NUMBER_FILE) ; fi

# Rebuild everything in case of a makefile/configuration change
.PHONY: all
ifneq ("$(CURRENT_BUILD_CONFIG)","$(LAST_BUILD_CONFIG)")
all: clean incrementalbuild
else
all: incrementalbuild
endif

.PHONY: incrementalbuild
incrementalbuild: $(BUILD_DIR) $(OBJECTS) $(BUILD_DIR)/$(PROJECT).elf $(BUILD_DIR)/$(PROJECT).bin
	$(SIZE) $(BUILD_DIR)/$(PROJECT).elf
	@echo "$(CURRENT_BUILD_CONFIG)" > $(BUILD_DIR)/build-config.txt

.PHONY: program
program: $(BUILD_DIR)/$(PROJECT).bin
	if ps -e | grep openocd ; then arm-none-eabi-gdb -batch -x flash.gdb ; else st-flash --reset write $(BUILD_DIR)/$(PROJECT).bin 0x8000000 ; fi

.PHONY: clean
clean:
	$(RM) $(BUILD_DIR)/*