AVR Makefile

Makefile

TARGET = example
MCU = atmega328p
PROG = avrisp
PORT = /dev/cu.*usb*
BAUD = 57600
F_CPU = 16000000

# Sources
LIBS = $(shell find lib/* -type d 2> /dev/null)
SRC = $(wildcard src/*.c) $(foreach LIB, $(LIBS), $(wildcard $(LIB)/*.c))
PSRC = $(wildcard src/*.cpp) $(foreach LIB, $(LIBS), $(wildcard $(LIB)/*.cpp))
OBJ = $(SRC:.c=.o) $(PSRC:.cpp=.o)
LST = $(SRC:.c=.lst) $(PSRC:.cpp=.lst)

# Compiler flags
CFLAGS = -D F_CPU=$(F_CPU) -g -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Iinclude $(patsubst %, -I%, $(LIBS))
LDFLAGS = -lm -Wl,-Map=$(TARGET).map,--cref
ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) -Wa,-adhlns=$(<:.c=.lst)
ALL_CXXFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) -Wa,-adhlns=$(<:.cpp=.lst)

# Commands
CC = avr-gcc
OBJCOPY = avr-objcopy
OBJDUMP = avr-objdump
SIZE = avr-size
AVRDUDE = avrdude
REMOVE = rm -f

%.hex: %.elf
	$(OBJCOPY) -O ihex -R .eeprom $< $@

%.eep: %.elf
	-$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 -O ihex $< $@

%.lss: %.elf
	$(OBJDUMP) -h -S $< > $@

%.elf: $(OBJ)
	$(CC) $(ALL_CFLAGS) $(OBJ) --output $@ $(LDFLAGS)

%.o: %.c
	$(CC) -c $(ALL_CFLAGS) $< -o $@

%.o: %.cpp
	$(CC) -c $(ALL_CXXFLAGS) $< -o $@

.SECONDARY: $(OBJS)

all: info $(TARGET).elf $(TARGET).hex $(TARGET).eep $(TARGET).lss size

size: $(TARGET).elf
	$(SIZE) -C --mcu=$(MCU) $(TARGET).elf

info:
	@$(CC) --version
	@echo
	@echo "libs:"
	@echo $(LIBS)
	@echo
	@echo "srcs:"
	@echo $(SRC) $(PSRC)
	@echo
	@echo "objects:"
	@echo $(OBJ)
	@echo

flash: $(TARGET).hex $(TARGET).eep
	$(AVRDUDE) -p $(MCU) -P $(PORT) -c $(PROG) -b $(BAUD) -U flash:w:$(TARGET).hex -vvv

clean:
	$(REMOVE) $(TARGET).hex
	$(REMOVE) $(TARGET).eep
	$(REMOVE) $(TARGET).elf
	$(REMOVE) $(TARGET).map
	$(REMOVE) $(TARGET).lss
	$(REMOVE) $(OBJ)
	$(REMOVE) $(LST)

serial:
	screen $(PORT) 9600

.PHONY: all size info flash clean serial