TARGET = stm32_project

BUILD_DIR = ./build

SRC_DIRS = \
	./src \
	./STM32F1xx_HAL_Driver/Src

SRCS := \
	$(shell find $(SRC_DIRS) -name *.c -or -name *.s) \
	./CMSIS/Device/ST/STM32F1xx/Source/Templates/gcc/startup_stm32f102xb.s \


INC_DIRS := \
	$(shell find $(SRC_DIRS) -type d) \
	./CMSIS/Include \
	./CMSIS/Device/ST/STM32F1xx/Include \
	./inc \
	./STM32F1xx_HAL_Driver/Inc

OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
DEPS := $(OBJS:.o=.d)
INC_FLAGS := $(addprefix -I,$(INC_DIRS))

CC = arm-none-eabi-gcc
AS = arm-none-eabi-as
CFLAGS :=  -MMD -MP -g
CFLAGS += -DSTM32F103xB
CFLAGS += -Os
CFLAGS += -mcpu=cortex-m3 -mfloat-abi=soft -mthumb --specs=nosys.specs -fdata-sections -ffunction-sections
CFLAGS += -Wall -Wextra
CFLAGS += -T ./CMSIS/Device/ST/STM32F1xx/Source/Templates/gcc/linker/STM32F103XB_FLASH.ld
CFLAGS += $(INC_FLAGS)
LDFLAGS = -Wl,--gc-sections

SIZECMD = arm-none-eabi-size --format=berkly $(BUILD_DIR)/$(TARGET).elf
OPENOCDCFG = -f "./ssi_converter_board.cfg"

all: $(BUILD_DIR)/$(TARGET).elf
	$(SIZECMD)

#executable
$(BUILD_DIR)/$(TARGET).elf: $(OBJS)
	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)

# assembly
$(BUILD_DIR)/%.s.o: %.s
	$(MKDIR_P) $(dir $@)
	$(AS) $(ASFLAGS) -c $< -o $@

# c source
$(BUILD_DIR)/%.c.o: %.c
	$(MKDIR_P) $(dir $@)
	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@

-include $(DEPS)
MKDIR_P ?= mkdir -p

.PHONY: clean flash debug _debug ocdserver gdbgui

flash: $(BUILD_DIR)/$(TARGET).elf
	$(SIZECMD)
	openocd $(OPENOCDCFG) -c "program $(BUILD_DIR)/${TARGET}.elf verify reset exit"

debug: $(BUILD_DIR)/$(TARGET).elf
	make _debug -j2

debug_attach: 
	make _debug_attach -j2
	
_debug: ocdserver gdbgui
_debug_attach: ocdserver gdbgui_attach

ocdserver: 
	openocd $(OPENOCDCFG) -c "gdb_port 3333"

gdbgui: $(BUILD_DIR)/$(TARGET).elf
	sleep 1s
	gdbgui -g arm-none-eabi-gdb \
		   --gdb-args  "-ex \"target remote localhost:3333\" \
		   				-ex \"load $(BUILD_DIR)/$(TARGET).elf \" \
		   				-ex \"file $(BUILD_DIR)/$(TARGET).elf \" \
						-ex \"monitor reset halt\""

gdbgui_attach: $(BUILD_DIR)/$(TARGET).elf
	sleep 1s
	gdbgui -g arm-none-eabi-gdb \
		   --gdb-args  "-ex \"target remote localhost:3333\" \
		   				-ex \"file $(BUILD_DIR)/$(TARGET).elf \" \
						-ex \"monitor halt\""

clean: 
	rm -rf $(BUILD_DIR)