/*
 * File:   led_2.c
 * Author: corrado
 *
 * Created on October 23, 2016, 11:16 AM
 */

#include <xc.h>

#define FOR_PRESS   0
#define FOR_RELEASE 1

int button_1_state = FOR_PRESS;
int button_2_state = FOR_PRESS;
int button_3_state = FOR_PRESS;

int is_button_1_pressed(void)
{
    if (button_1_state == FOR_PRESS && PORTAbits.RA3 == 0) {
      // we are checking ``PRESS'' and RA3 has been pressed
      button_1_state = FOR_RELEASE;
      return 1;
    }
    else if (button_1_state == FOR_RELEASE && PORTAbits.RA3 == 1) {
      // we are checking ``RELEASE'' and RA3 has been released
      button_1_state = FOR_PRESS;
    }
    return 0;
}

int is_button_2_pressed(void)
{
    if (button_2_state == FOR_PRESS && PORTAbits.RA2 == 0) {
      // we are checking ``PRESS'' and RA3 has been pressed
      button_2_state = FOR_RELEASE;
      return 1;
    }
    else if (button_2_state == FOR_RELEASE && PORTAbits.RA2 == 1) {
      // we are checking ``RELEASE'' and RA3 has been released
      button_2_state = FOR_PRESS;
    }
    return 0;
}

int is_button_3_pressed(void)
{
    if (button_3_state == FOR_PRESS && PORTCbits.RC2 == 0) {
      // we are checking ``PRESS'' and RA3 has been pressed
      button_3_state = FOR_RELEASE;
      return 1;
    }
    else if (button_3_state == FOR_RELEASE && PORTCbits.RC2 == 1) {
      // we are checking ``RELEASE'' and RA3 has been released
      button_3_state = FOR_PRESS;
    }
    return 0;
}


void main(void)
{
  // ... set-up ports by TRIS registers
  TRISAbits.TRISA3 = 1;
  TRISAbits.TRISA2 = 1;
  TRISCbits.TRISC2 = 1;
  TRISBbits.TRISB0 = 0;
  TRISBbits.TRISB1 = 0;
  TRISBbits.TRISB2 = 0;
  LATBbits.LATB0 = 1;
  for (;;) {  // loop forever
      if (is_button_1_pressed()) LATBbits.LATB0 = !LATBbits.LATB0;
      if (is_button_2_pressed()) LATBbits.LATB1 = !LATBbits.LATB1;
      if (is_button_3_pressed()) LATBbits.LATB2 = !LATBbits.LATB2;
  }
}