// PIC18 in C - Versione 0.2 - Febbraio 2016
// Copyright (c) 2014, Vincenzo Villa
// Creative Commons | Attribuzione-Condividi allo stesso modo 3.0 Unported.
// Creative Commons | Attribution-Share Alike 3.0 Unported
// https://www.vincenzov.net/tutorial/PIC18/hello-2.htm

// Reference: PIC18F14K50 data sheet (note: page as DS41350C printed edition)

// [1] REGISTER 9-7: TRISB: PORTB TRI-STATE REGISTER - Page 86
// [2] REGISTER 9-8: WPUB: WEAK PULL-UP PORTB REGISTER - Page 86
// [3] REGISTER 7-2: INTCON2: INTERRUPT CONTROL 2 REGISTER - Page 66
// [4] REGISTER 9-16: ANSELH: ANALOG SELECT REGISTER 2 - Page 95
// [5] REGISTER 9-12: TRISC: PORTC TRI-STATE REGISTER - Page 90
// [6] REGISTER 9-6: PORTB: PORTB REGISTER - Page 86
// [7] REGISTER 9-11: PORTC: PORTC REGISTER - Page 90

#include "configurationsbits.h"

void main(void) {
    TRISBbits.RB4 = 1;     // Set RB4 pin as input [1]
    WPUBbits.WPUB4 = 1;    // Enable RB4 pull-up [2]
    INTCON2bits.RABPU = 0; // Enable global PORTB pullup [3]
    ANSELHbits.ANS10 = 0;  // Enable digital input buffer of RB4 [4]

    TRISCbits.RC0 = 0;     // Set RC0 pin as Output [5]
    
    while (1) {
        if (PORTBbits.RB4 == 0)// Test if pin RB4 is low [6]
            LATCbits.LATC0 = 1; // Turn on RC0 pin [7]
        else
            LATCbits.LATC0 = 0; // Turn off RC0 pin [7]
    }
}