######################################
# target
######################################
TARGET = stm32g0_blinky
PART = STM32G030xx
PYOCD_TARGET = stm32g030f6px


######################################
# building variables
######################################
# debug build?
DEBUG = 1
# optimization for size
OPT = -Os


#######################################
# paths
#######################################
# Build path
BUILD_DIR = build
VND_DIR = ../../../vendor

######################################
# source
######################################
# C sources
include hal.mk
C_SOURCES += \
$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Device/ST/STM32G0xx/Source/Templates/system_stm32g0xx.c \
src/main.c


# ASM sources
ASM_SOURCES =  \
$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Device/ST/STM32G0xx/Source/Templates/gcc/startup_stm32g030xx.s

#######################################
# binaries
#######################################
PREFIX = arm-none-eabi-

CC = $(PREFIX)gcc
CP = $(PREFIX)objcopy
#SZ = $(PREFIX)size

BIN = $(CP) -O binary -S

#######################################
# CFLAGS
#######################################

ifeq ($(DEBUG), 1)
DEBUG_FLAGS = -gdwarf-3
endif

# cpu
CPU = \
 -mcpu=cortex-m0plus

DEFINES = -D$(PART)

# fpu
FPU = 

# float-abi
FLOAT-ABI =

# mcu
MCU = $(CPU) $(FPU) $(FLOAT-ABI)

# C includes
C_INCLUDES +=  \
 -Isrc/inc \
 -I$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Core/Include \
 -I$(VND_DIR)/STM32CubeG0/Drivers/CMSIS/Device/ST/STM32G0xx/Include

# compile gcc flags
ADDN_CFLAGS = \
 -Wall \
 -fdata-sections \
 -ffunction-sections

CFLAGS = $(MCU) $(ADDN_CFLAGS) $(C_INCLUDES) $(DEBUG_FLAGS) $(OPT) $(DEFINES)


# Generate dependency information
#CFLAGS += -MMD -MP -MF"$(@:%.o=%.d)"


ASFLAGS = $(MCU) $(DEBUG_FLAGS) $(OPT) -Wa,--warn

#######################################
# LDFLAGS
#######################################
# link script
LDSCRIPT = $(VND_DIR)/Ld/STM32G030F6MX_FLASH.ld

LIBDIR = 
LDFLAGS =  \
 $(MCU)  \
 -T $(LDSCRIPT) \
 --specs=nano.specs \
 -specs=nosys.specs -lc -lm \
 -Wl,--gc-sections \
 -Wl,--print-memory-usage \
 -Wl,--no-warn-rwx-segments

# default action: build all
all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).bin


#######################################
# build the application
#######################################
# list of objects
OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(C_SOURCES:.c=.o)))
vpath %.c $(sort $(dir $(C_SOURCES)))

# list of ASM program objects
OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(ASM_SOURCES:.s=.o)))
vpath %.s $(sort $(dir $(ASM_SOURCES)))

$(BUILD_DIR)/%.o: %.c Makefile | $(BUILD_DIR)
	$(CC) -c $(CFLAGS) -Wa,-a,-ad,-alms=$(BUILD_DIR)/$(notdir $(<:.c=.lst)) $< -o $@

$(BUILD_DIR)/%.o: %.s Makefile | $(BUILD_DIR)
	$(CC) -c $(ASFLAGS) $< -o $@

#$(LUAOBJECTS) $(OBJECTS)
$(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) Makefile
	$(CC) $(OBJECTS) $(LDFLAGS) -o $@

$(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
	$(BIN) $< $@	
	
$(BUILD_DIR):
	mkdir $@		

#######################################
# Program
#######################################

flash: $(BUILD_DIR)/$(TARGET).bin
	pyocd load --target $(PYOCD_TARGET) $(BUILD_DIR)/$(TARGET).bin

#######################################
# clean up
#######################################
clean:
	-rm -fR $(BUILD_DIR)
  
# *** EOF ***