ADC Settings

FRC

Does your uC have a FRC to use as the clock source? Nice and simple if it does.

FVR

Does your uC have a FVR to use as the reference voltage? Useful if you want an accurate reference, but not useful it you want your analog readings referenced to the uC power rail of course. Note check the accuracy of your devices FVR – some actually have really bad accuracy specs!

You need to add it as a separate peripheral and select its multiplier to give the reference voltage you want

Using in your code

#include "mcc_generated_files/adc.h"

//INITIALISE
	//Start AtoD Conversion
	ADC_SelectChannel(channel_AN1);
	ADC_StartConversion();


//PROCESS ATOD

	//Exit if last conversion is not complete
	if (!ADC_IsConversionDone())
		return;

	//Get result of last conversion
	atod_result = (uint16_t)ADC_GetConversionResult();

	//Start next measurement
	ADC_SelectChannel(channel_AN1);
	ADC_StartConversion();

An example function to handle AtoD measurements

//************************************
//************************************
//********** PROCESS A TO D **********
//************************************
//************************************
void ProcessAtoD (void)
{
	uint16_t AtodResult;
	uint8_t u8Ttemp;

	//Exit if last conversion is not complete
	if (!ADC_IsConversionDone())
		return;

	//Get result of last conversion
	AtodResult = (uint16_t)ADC_GetConversionResult();

	//0-5V = 0-1023
	//Arduino is 0-3.3V
	//1.65V = 337
	
	u8Ttemp = (uint8_t)((ADCON0 >> 2) & 0x0f);
	switch (u8Ttemp)
	{
	case 0:
		//--------------------
		//----- AN0 DONE -----
		//--------------------
		//if (AtodResult > 562)

		ADC_SelectChannel(channel_AN1);
		break;
		
	case 1:
		//--------------------
		//----- AN1 DONE -----
		//--------------------
		//if (AtodResult > 562)

		ADC_SelectChannel(channel_AN2);
		break;

	case 2:
		//--------------------
		//----- AN2 DONE -----
		//--------------------
		//AtodResult

		ADC_SelectChannel(channel_AN0);
		break;


	default:
		ADC_SelectChannel(channel_AN0);
		break;
	} //switch (u8Ttemp)

	//----- START NEXT CONVERSION -----
	ADC_StartConversion();
}