MakeFile_for_AVR

# Make directory tree as below
#--------------------
#.
#├─ Makefile
#└─ src
#  └─ main.c
#--------------------

# Project settings
PROG     = hello
#PROG   = $(shell basename `readlink -f .`)
MCU      = atmega328p

# Compiler settings
COMPILER = avr-gcc
OBJCOPY  = avr-objcopy
CFLAGS   = -g -O2 -mmcu=$(MCU)
LDFLAGS  =
LIBS     =
INCLUDE  = -I./include

# filename and directories
HEX      = $(PROG).hex
SRCDIR   = ./src
SOURCES  = $(wildcard $(SRCDIR)/*.c)
OBJDIR   = ./obj
OBJECTS  = $(addprefix $(OBJDIR)/, $(notdir $(SOURCES:.c=.o)))
DEPENDS  = $(OBJECTS:.o=.d)

# Generate ihex format file
$(HEX): $(PROG)
	$(OBJCOPY) -j .text -j .data -O ihex $< $@

# Link objects
$(PROG): $(OBJECTS) $(LIBS)
	$(COMPILER) $(LDFLAGS) $^ -o $@

# Compile SOURCES
$(OBJDIR)/%.o: $(SRCDIR)/%.c
	-mkdir -p $(OBJDIR)
	$(COMPILER) $(CFLAGS) $(INCLUDE) -c $< -o $@

all: clean $(HEX)

.PHONY: clean
clean:
	-$(RM) $(OBJECTS) $(DEPENDS) $(PROG) $(HEX)

-include $(DEPENDS)