Add NO_VTARGET_DETECT compile time option to the AVRISP-MKII clone project, to disable VTARGET detection on AVR models with an on-chip ADC.

Projects/AVRISP-MKII/AVRISP.txt

@@ -247,7 +247,7 @@
  *   <tr>
  *    <td>VTARGET_ADC_CHANNEL</td>
  *    <td>Makefile CDEFS</td>
- *    <td>ADC channel number (on supported AVRs) to use for VTARGET level detection.</td> 
+ *    <td>ADC channel number (on supported AVRs) to use for VTARGET level detection, if NO_VTARGET_DETECT is not defined.</td> 
  *   </tr>
  *   <tr>
  *    <td>ENABLE_ISP_PROTOCOL</td>
@@ -267,5 +267,11 @@
  *        seperate ISP, PDI, and TPI programming headers) but increases programming speed dramatically.
  *        <i>Ignored when compiled for the XPLAIN board.</i></td>  
  *   </tr>
+ *   <tr>
+ *    <td>NO_VTARGET_DETECT</td>
+ *    <td>Makefile CDEFS</td>
+ *    <td>Define to disable VTARGET sampling and reporting on AVR models with an ADC converter. This will cause the programmer
+ *        to report a fixed 5V target voltage to the host regardless of the real target voltage.</td>  
+ *   </tr>
  *  </table>
  */

Projects/AVRISP-MKII/Lib/V2ProtocolParams.c

@@ -97,7 +97,7 @@ void V2Params_LoadNonVolatileParamValues(void)
  */
 void V2Params_UpdateParamValues(void)
 {
-	#if defined(ADC)
+	#if (defined(ADC) && !defined(NO_VTARGET_DETECT))
 	/* Update VTARGET parameter with the latest ADC conversion of VTARGET on supported AVR models */
 	V2Params_GetParamFromTable(PARAM_VTARGET)->ParamValue = ((5 * 10 * ADC_GetResult()) / 1024);
 	#endif

Projects/AVRISP-MKII/makefile

@@ -198,6 +198,7 @@ CDEFS += -DVTARGET_ADC_CHANNEL=2
 CDEFS += -DENABLE_ISP_PROTOCOL
 CDEFS += -DENABLE_XPROG_PROTOCOL
 #CDEFS += -DXPROG_VIA_HARDWARE_USART
+#CDEFS += -DNO_VTARGET_DETECT
 
 
 # Place -D or -U options here for ASM sources