// PIC18F14K50 in C - Versione 1.0 - Settembre 2014
// Copyright (c) 2014 VincenzoV.net
// Creative Commons | Attribuzione-Condividi allo stesso modo 3.0 Unported.
// Creative Commons | Attribution-Share Alike 3.0 Unported
// https://www.vincenzov.net/tutorial/PIC18/adc.htm

// ADC (PLIB)

#define VREF 3.20

#define USE_OR_MASKS // Use the OR mask setting

#include "configurationbits.h"
#include "adc.h"

void display(unsigned voltage);

void main(void) // Program start here
{
    unsigned int voltage10bits;
    double voltage;

    OSCCON = 0x70; // Set internal clock to 16 MHz

    TRISC = 0x00; // Port C as output
    
    TRISBbits.RB5 = 1; // Disable digital output buffer for AN11/RB5 pin
    ANSELHbits.ANS11 = 1; // Disable digital input buffer for AN11 pin

    OpenADC(ADC_FOSC_16 | ADC_RIGHT_JUST | ADC_2_TAD,
            ADC_CH11 | ADC_INT_OFF,
            ADC_REF_VDD_VSS,
            0);
                                     // Config ADC - See PLIB documentation

    while (1) {

        ConvertADC();              // Start of conversion
        while (BusyADC());         // Wait until end of conversion
        voltage10bits = ReadADC(); // Read data

        voltage = (double) VREF / 1024 * voltage10bits;
        display(voltage10bits);
    }

}

void display(unsigned voltage) {

    voltage = voltage + 64;
    voltage = (voltage >> 7);
    PORTC = ~(0xFF << voltage);
}