/*
 * File:   led_4.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 show_leds(int v)
{
    switch (v) {
        case 0: 
            LATBbits.LATB2 = 0;
            LATBbits.LATB3 = 1;
            LATBbits.LATB4 = 1;
            LATBbits.LATB5 = 1;
            break;
        case 1: 
            LATBbits.LATB2 = 1;
            LATBbits.LATB3 = 0;
            LATBbits.LATB4 = 1;
            LATBbits.LATB5 = 1;
            break;
        case 2: 
            LATBbits.LATB2 = 1;
            LATBbits.LATB3 = 1;
            LATBbits.LATB4 = 0;
            LATBbits.LATB5 = 1;
            break;
        case 3: 
            LATBbits.LATB2 = 1;
            LATBbits.LATB3 = 1;
            LATBbits.LATB4 = 1;
            LATBbits.LATB5 = 0;
            break;
    }
}

#define MAX 800000

void main(void)
{
    long timer_count = 0;
    int cycle = 0;
    // ... set-up ports by TRIS registers
    TRISAbits.TRISA3 = 1;
    TRISAbits.TRISA2 = 1;
    TRISCbits.TRISC2 = 1;
    TRISBbits.TRISB0 = 0;
    TRISBbits.TRISB1 = 0;
    TRISBbits.TRISB2 = 0;
    TRISBbits.TRISB3 = 0;
    TRISBbits.TRISB4 = 0;
    TRISBbits.TRISB5 = 0;
    LATB = 0xff;
    LATBbits.LATB2 = 0;
    for (;;) {  // loop forever
        if (is_button_1_pressed()) {
            timer_count = 0;
            LATBbits.LATB0 = !LATBbits.LATB0;
        }
        if (is_button_2_pressed()) {
            timer_count = 0;
            LATBbits.LATB1 = !LATBbits.LATB1;
        }
        if (is_button_3_pressed()) {
            timer_count = 0;
            cycle = (cycle + 1) % 4;
            show_leds(cycle);
        }
        ++timer_count;
        if (timer_count == MAX) {
            cycle = 0;
            show_leds(cycle);
            LATBbits.LATB0 = 1;
            LATBbits.LATB1 = 1;
            timer_count = 0;
        }
    }
}