Move ADC VTARGET sampling to a new V2Params_UpdateParamValues() in the AVRISP project so that there is a central place where all non-PC set target values can be updated easily.

Projects/AVRISP/AVRISP.c

@@ -46,7 +46,7 @@ int main(void)
 {
 	SetupHardware();
 
-	V2Params_LoadEEPROMParamValues();
+	V2Params_LoadNonVolatileParamValues();
 	
 	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 
@@ -54,11 +54,8 @@ int main(void)
 	{
 		Process_AVRISP_Commands();
 		
-		#if defined(ADC)
-		/* Update VTARGET parameter with the latest ADC conversion of VTARGET on supported AVR models */
-		V2Params_SetParameterValue(PARAM_VTARGET, ((5 * 10 * ADC_GetResult()) / 1024));
-		#endif
-
+		V2Params_UpdateParamValues();
+		
 		USB_USBTask();
 	}
 }

Projects/AVRISP/Lib/V2ProtocolParams.c

@@ -85,12 +85,25 @@ static ParameterItem_t ParameterTable[] =
 
 
 /** Loads saved non-volatile parameter values from the EEPROM into the parameter table, as needed. */
-void V2Params_LoadEEPROMParamValues(void)
+void V2Params_LoadNonVolatileParamValues(void)
 {
-	/* Target RESET line polarity is a non-volatile value, retrieve current parameter value from EEPROM */
+	/* Target RESET line polarity is a non-volatile value, retrieve current parameter value from EEPROM -
+	 *   NB: Cannot call V2Protocol_SetParameterValue() here, as that will cause another EEPROM write!
+	 */
 	V2Params_GetParamFromTable(PARAM_RESET_POLARITY)->ParamValue = eeprom_read_byte(&EEPROM_Rest_Polarity);
 }
 
+/** Updates any parameter values that are sourced from hardware rather than explicitly set by the host, such as
+ *  VTARGET levels from the ADC on supported AVR models.
+ */
+void V2Params_UpdateParamValues(void)
+{
+	#if defined(ADC)
+	/* 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
+}
+
 /** Retrieves the host PC read/write privellages for a given parameter in the parameter table. This should
  *  be called before calls to \ref V2Params_GetParameterValue() or \ref V2Params_SetParameterValue() when
  *  getting or setting parameter values in response to requests from the host.

Projects/AVRISP/Lib/V2ProtocolParams.h

@@ -42,6 +42,10 @@
 
 		#include <LUFA/Version.h>
 
+		#if defined(ADC)
+			#include <LUFA/Drivers/Peripheral/ADC.h>
+		#endif
+		
 		#include "V2Protocol.h"
 		#include "V2ProtocolConstants.h"
 
@@ -62,7 +66,8 @@
 		} ParameterItem_t;
 
 	/* Function Prototypes: */
-		void    V2Params_LoadEEPROMParamValues(void);
+		void    V2Params_LoadNonVolatileParamValues(void);
+		void    V2Params_UpdateParamValues(void);
 	
 		uint8_t V2Params_GetParameterPrivellages(uint8_t ParamID);
 		uint8_t V2Params_GetParameterValue(uint8_t ParamID);