Basic import

.gitignore

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+*.o
+*.elf
+*.lst
+*.hex
+*.bin
+*.asm

Makefile

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+OPTIMIZE = -O2
+CPPFLAGS += -DF_CPU=$(MCU_FREQ)
+override CFLAGS = -g --std=c99 -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET)
+override LDFLAGS =
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+AVRDUDE_ARGS =
+
+ifdef BOARD
+include boards/$(BOARD).mk
+endif
+
+default: $(PROG).hex
+
+clean:
+	rm -rf *.o drivers/*.o *.elf *.lst *.hex *.bin *.asm
+
+# dependencies
+blink.elf: drivers/led.o
+
+# generic rules
+%.o: %.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $^
+
+%.elf: %.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
+
+%.lst: %.elf
+	$(OBJDUMP) -h -S $< > $@
+
+%.hex: %.elf
+	$(OBJCOPY) -j .text -j .data -O ihex $< $@
+
+%.bin: %.elf
+	$(OBJCOPY) -j .text -j .data -O binary $< $@
+
+%.asm: %.elf
+	$(OBJDUMP) -z -j .text -m avr5 -d $< > $@
+
+# flashing definitions and helper target
+AVRDUDE_ARGS += -p$(MCU_TARGET)
+AVRDUDE_ARGS += -c$(AVRDUDE_TYPE)
+ifdef AVRDUDE_TTY
+AVRDUDE_ARGS += -P$(AVRDUDE_TTY)
+endif
+ifdef AVRDUDE_BAUD
+AVRDUDE_ARGS += -b$(AVRDUDE_BAUD)
+endif
+
+ifdef AVRDUDE_TYPE
+flash: $(PROG).hex
+	avrdude $(AVRDUDE_ARGS) -U flash:w:$(PROG).hex
+endif

boards/nano.mk

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+MCU_TARGET = atmega328p
+MCU_FREQ = 16000000UL
+CPPFLAGS += -DLED_PORT=PORTB -DLED_PIN=5
+
+AVRDUDE_TYPE = arduino
+AVRDUDE_TTY = /dev/ttyUSB0
+AVRDUDE_BAUD = 57600