Reorganize to allow compiling and running AVR firmware

src/arch/avr/arch.mk

@@ -0,0 +1,26 @@
+CC=avr-gcc -mmcu=$(EC)
+OBJ=$(patsubst src/%.c,$(BUILD)/%.o,$(SRC))
+
+# Run EC rom in simulator
+sim: $(BUILD)/ec.elf
+	simavr $< --mcu $(EC)
+
+# Convert from Intel Hex file to binary file
+$(BUILD)/ec.rom: $(BUILD)/ec.ihx
+	@mkdir -p $(@D)
+	makebin -p < $< > $@
+
+# Convert from ELF file to Intel Hex file
+$(BUILD)/ec.ihx: $(OBJ)
+	@mkdir -p $(@D)
+	avr-objcopy -j .text -j .data -O ihex $< $@
+
+# Link object files into ELF file
+$(BUILD)/ec.elf: $(OBJ)
+	@mkdir -p $(@D)
+	$(CC) -o $@ $^
+
+# Compile C files into object files
+$(BUILD)/%.o: src/%.c $(INCLUDE)
+	@mkdir -p $(@D)
+	$(CC) -o $@ -c $<