Update Makefile

src/Makefile

@@ -1,21 +1,28 @@
-MCU    = attiny85
-# TODO: change frequency after moving to external oscillator
-F_CPU  = 1000000UL
-TARGET = main
-
-CC      = avr-gcc
-OBJCOPY = avr-objcopy
-
-# check if this is legit with assembly code only
-CFLAGS  = -mmcu=$(MCU) -Wall -Os -DF_CPU=$(F_CPU)
+MCU        = attiny85
+F_CPU      = 1000000UL
+TARGET     = main
+SRCS       = main.S
+CC         = avr-gcc
+OBJCOPY    = avr-objcopy
+PORT       = /dev/tty.usbmodem101
+BAUD       = 19200
+PROGRAMMER = usbasp
+AVRDUDE    = avrdude -P $(PORT) -b $(BAUD)
+CFLAGS     = -mmcu=$(MCU) -Wall -Os -DF_CPU=$(F_CPU)
 
 all: $(TARGET).hex
 
-$(TARGET).elf: $(TARGET).S
+$(TARGET).elf: $(SRCS)
 	$(CC) $(CFLAGS) -o $@ $<
 
 $(TARGET).hex: $(TARGET).elf
 	$(OBJCOPY) -j .text -j .data -O ihex $< $@
 
+# Flash to MCU
+install: $(TARGET).hex
+	$(AVRDUDE) -c $(PROGRAMMER) -p $(MCU) -U flash:w:$(TARGET).hex:i -v
+
 clean:
 	rm -f *.elf *.hex
+
+.PHONY: all install clean