Add firmware template

firmware/.gitignore

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+*.o
+*.hex
+*.obj
+*.hex

firmware/Makefile

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+MCU=atmega88
+CFLAGS=-g -Wall -mcall-prologues -mmcu=$(MCU) -Os -DF_CPU=8000000
+LDFLAGS=-Wl,-gc-sections -Wl,-relax
+CC=avr-gcc
+TARGET=main
+OBJECT_FILES=main.o
+
+all: $(TARGET).hex
+
+clean:
+	rm -f *.o *.hex *.obj *.hex
+
+%.hex: %.obj
+	avr-objcopy -R .eeprom -O ihex $< $@
+
+%.obj: $(OBJECT_FILES)
+	$(CC) $(CFLAGS) $(OBJECT_FILES) $(LDFLAGS) -o $@
+
+program: $(TARGET).hex
+	avrdude -p $(MCU) -c usbasp -U flash:w:$(TARGET).hex

firmware/main.c

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+#include <avr/io.h>
+
+int main()
+{
+	
+}