SRC = $(TARGET).c                                                 \
          AVRISPDescriptors.c                                         \
          USARTDescriptors.c                                          \
-         Lib/RingBuff.c                                              \
          Lib/SoftUART.c                                              \
          $(AVRISP_PATH)/Lib/V2Protocol.c                             \
       $(AVRISP_PATH)/Lib/V2ProtocolParams.c                       \
 CDEFS += -DAUX_LINE_DDR=DDRB
 CDEFS += -DAUX_LINE_MASK="(1 << 4)"
 CDEFS += -DVTARGET_ADC_CHANNEL=2
+CDEFS += -DVTARGET_REF_VOLTS=3.3
+CDEFS += -DVTARGET_SCALE_FACTOR=2
 #CDEFS += -DLIBUSB_DRIVER_COMPAT