Makefile AVR example

caution

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# C/C++ AVR Makefile
# GCC_PATH = /usr/avr8-gnu-toolchain-linux_x86_64/bin
PREFIX = avr-

TARGET =
MCU_TARGET=
MCU_F_CPU =

DEBUG = 1

PROGRAMMER =
PORT =
BAUDRATE =
BITCLOCK = 0.5 # ms

BUILD_DIR = build

UPLOAD = avrdude -p$(MCU_TARGET) -c$@ -v -Uflash:w:$(BUILD_DIR)/$(TARGET).elf:e
# Disable flash auto erase
# UPLOAD += -D

rwildcard=$(wildcard $1$2) $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2))

ifdef GCC_PATH
CC = $(GCC_PATH)/$(PREFIX)gcc
CXX = $(GCC_PATH)/$(PREFIX)g++
CP = $(GCC_PATH)/$(PREFIX)objcopy
OD = $(GCC_PATH)/$(PREFIX)objdump
SZ = $(GCC_PATH)/$(PREFIX)size
else
CC = $(PREFIX)gcc
CXX = $(PREFIX)g++
CP = $(PREFIX)objcopy
OD = $(PREFIX)objdump
SZ = $(PREFIX)size
endif

# C, CXX COMMON
C_FLAGS  = -Wall -mmcu=$(MCU_TARGET) -DF_CPU=$(MCU_F_CPU)
C_FLAGS += -O1
C_FLAGS += -ffunction-sections -fdata-sections
C_FLAGS += -fshort-enums

# Dependency
C_FLAGS += -MMD -MP -MF"$(@:%.o=%.d)"

ifeq ($(DEBUG), 1)
C_FLAGS += -g
endif

CFLAGS  = $(C_FLAGS)
CFLAGS += -fpack-struct

CXXFLAGS  = $(C_FLAGS)
CXXFLAGS += -std=c++17

LDFLAGS  = -mmcu=$(MCU_TARGET) -Wl,-Map,$(BUILD_DIR)/$(TARGET).map
LDFLAGS += -Wl,--gc-sections

CSRCS =

CXXSRCS =

INC_DIRS =
INC_DIRS += $(addprefix -I,$(sort $(dir $(CSRCS))))
INC_DIRS += $(addprefix -I,$(sort $(dir $(CXXSRCS))))

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

.PHONY: clean
clean: ;rm -rf $(BUILD_DIR)

.PHONY: upload
upload: $(PROGRAMMER)

.PHONY:clang-format
clang-format: $(call rwildcard,,*.c) $(call rwildcard,,*.cpp) $(call rwildcard,,*.h)
    clang-format -style=file -i -verbose $^

$(BUILD_DIR):
    mkdir $@

vpath %.c $(sort $(dir $(CSRCS)))
$(BUILD_DIR)/%.o: %.c | $(BUILD_DIR)
    $(CC) $(CFLAGS) $(INC_DIRS) -Wa,-a,-ad,-alms=$(@:.o=.lst) -c -o $@ $<

vpath %.cpp $(sort $(dir $(CXXSRCS)))
$(BUILD_DIR)/%.o: %.cpp | $(BUILD_DIR)
    $(CXX) $(CXXFLAGS) $(INC_DIRS) -Wa,-a,-ad,-alms=$(@:.o=.lst) -c -o $@ $<

OBJS  = $(addprefix $(BUILD_DIR)/,$(notdir $(CSRCS:.c=.o)))
OBJS += $(addprefix $(BUILD_DIR)/,$(notdir $(CXXSRCS:.cpp=.o)))
OBJS += $(call rwildcard,obj,*.o)

$(BUILD_DIR)/$(TARGET).elf: $(OBJS)
    $(CXX) $(LDFLAGS) -o $@ $^
    $(OD) -h -S "$@" > "$(@:%.elf=%.lss)"
    $(SZ) -C --mcu=$(MCU_TARGET) $@

$(BUILD_DIR)/$(TARGET).hex: $(BUILD_DIR)/$(TARGET).elf
    $(CP) -j .text -j .data -O ihex $< $@

-include $(wildcard $(BUILD_DIR)/*.d)

stk500: ;$(UPLOAD) -P$(PORT)
avrispmkII: ;$(UPLOAD) -B$(BITCLOCK)
arduino: ;$(UPLOAD) -P$(PORT) -b$(BAUDRATE)
wiring: ;$(UPLOAD) -P$(PORT) -b$(BAUDRATE)
atmelice_isp: ;$(UPLOAD)