// 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 (8 bit)

#define VREF 3.20

#include "configurationbits.h"

void display(unsigned voltage);
void display2(unsigned voltage);
void display3(unsigned voltage);

void main(void) // Program start here
{

    unsigned char voltage8bits;
    double voltage;

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

    TRISC = 0x00; // Port C as output

    TRISBbits.RB5 = 1; // Disable digital output buffer on AN11/RB5
    ANSELHbits.ANS11 = 1; // Disable digital input buffer for AN11

    ADCON2bits.ADFM = 0; // Left justified
    ADCON2bits.ADCS = 0b101; // A/D Conversion Clock = FOSC/16 (1 us @ 16 MHz)


    ADCON2bits.ACQT = 0b001; // A/D Acquisition time set to 2 TAD

    ADCON1 = 0; // Set VDD and VSS as voltage reference

    ADCON0bits.CHS = 0b1011; // Analog Channel Select AN11
    ADCON0bits.ADON = 1; //  ADC is enabled
    while (1) {
        ADCON0bits.GO = 1; // Start conversion

        while (ADCON0bits.nDONE); // Wait End Of Conversion
        voltage8bits = ADRESH; // Read voltage (8 bit only!)
        voltage = (double) VREF / 256 * voltage8bits;
        display3(voltage8bits);
    }

}

void display(unsigned voltage) {
    PORTC = voltage;
}

void display2(unsigned voltage) {
    voltage = voltage >> 5;
    PORTC = 1 << voltage;
}

void display3(unsigned voltage) {

    voltage = voltage + 16;
    voltage = (voltage >> 5);
    PORTC = ~(0xFF << voltage);
}