--- a/trackswitch/Makefile	Sun Oct 28 16:18:53 2012 +0100
+++ b/trackswitch/Makefile	Sun Oct 28 17:41:10 2012 +0100
@@ -13,6 +13,11 @@
 BAUD=38400
 
 ISP_BAUD = 115200
+ifdef USB
+PORT=/dev/ttyUSB$(USB)
+else
+PORT=/dev/ttyS0
+endif
 
 #SRC = main.c seriald.c driver/ADC.c driver/clock.c driver/timer.c
 #SRC = main.c driver/rs232.c driver/manchester.c
@@ -74,7 +79,10 @@
 	rm $(PRG).map
 
 program: code
-	$(AVRDUDE) -c stk500v2 -b $(ISP_BAUD) -i 1 -p $(MCU) -V -U flash:w:$(PRG).hex:i
+	$(AVRDUDE) -P $(PORT) -c stk500v2 -b $(ISP_BAUD) -i 1 -p $(MCU) -V -U flash:w:$(PRG).hex:i
+
+backup:
+	$(AVRDUDE) -P $(PORT) -c stk500v2 -b $(ISP_BAUD) -i 1 -p $(MCU) -V -U flash:r:$(PRG)_backup.hex:i
 
 fuse:
 	$(AVRDUDE) -c stk500 -p $(MCU) -V $(FUSES)