Kevin Lara - 201110510072 - Microcontroladores - 18/06/2016

// Kevin Lara - 201110510072 - Microcontroladores - 18/06/2016

#define LED_1  LATA.F0
#define LED_2  LATA.F1

#define BUTTON_1_2_PRESSED  0
#define BUTTON_1_PRESSED    4
#define BUTTON_2_PRESSED    8

#define EVERLOOP  while (1)

#define STATE_LOW   0
#define STATE_HIGH  1

#define MILLIS_DEFAULT  5750

#define DELAY_EVERLOOP  delay_ms(MILLIS_DEFAULT)

unsigned int _PortState;

unsigned int _Timer1Counter;

void initMCU() {
  ANCON0  = ANCON1  = 0;
  TRISA             = 0;
  TRISD             = 12;
  LATA    = LATD    = 0;
  PORTA   = PORTD   = 0;
}

void initTimer0() {
  // Time : 100 us

  T0CON       = 0x88;
  TMR0H       = 0xFB;
  TMR0L       = 0x50;
  GIE_bit     = 1;
  TMR0IE_bit  = 1;
}

void initTimer1() {
  // Time : 10 ms

  T1CON       = 0x11;
  TMR1IF_bit  = 0;
  TMR1H       = 0x15;
  TMR1L       = 0xA0;
  TMR1IE_bit  = 1;
  INTCON      = 0xC0;
}

void interrupt() {
  if (TMR0IF_bit) {
    int stateLed1 = STATE_LOW;
    int stateLed2 = STATE_LOW;

    TMR0IF_bit  = 0;
    TMR0H       = 0xFB;
    TMR0L       = 0x50;

    switch (PORTD) {
      case BUTTON_1_2_PRESSED:
        _PortState = 0;

        if (stateLed1 == STATE_LOW && LED_1 == STATE_LOW) {
          LED_1 = STATE_HIGH;
        } else if (stateLed1 == STATE_HIGH && LED_1 == STATE_HIGH) {
          LED_1 = STATE_LOW;
        }

        if (stateLed2 == STATE_LOW && LED_2 == STATE_LOW) {
          LED_2 = STATE_HIGH;
        } else if (stateLed2 == STATE_HIGH && LED_2 == STATE_HIGH) {
          LED_2 = STATE_LOW;
        }
        break;

      case BUTTON_1_PRESSED:
        _PortState = 1;

        if (stateLed1 == STATE_LOW && LED_1 == STATE_LOW) {
          LED_1 = STATE_HIGH;
        } else if (stateLed1 == STATE_HIGH && LED_1 == STATE_HIGH) {
          LED_1 = STATE_LOW;
        }
        break;

      case BUTTON_2_PRESSED:
        _PortState = 2;

        if (stateLed2 == STATE_LOW && LED_2 == STATE_LOW) {
          LED_2 = STATE_HIGH;
        } else if (stateLed2 == STATE_HIGH && LED_2 == STATE_HIGH) {
          LED_2 = STATE_LOW;
        }
        break;

      default:
        _PortState = 3;

        if (stateLed1 == STATE_LOW && LED_1 == STATE_HIGH) {
          stateLed1 = STATE_HIGH;
        } else if (stateLed1 == STATE_HIGH && LED_1 == STATE_LOW) {
          stateLed1 = STATE_LOW;
        }

        if (stateLed2 == STATE_LOW && LED_2 == STATE_HIGH) {
          stateLed2 = STATE_HIGH;
        } else if (stateLed2 == STATE_HIGH && LED_2 == STATE_LOW) {
          stateLed2 = STATE_LOW;
        }
        break;
    }
  } else if (TMR1IF_bit) {
    TMR1IF_bit  = 0;
    TMR1H       = 0x15;
    TMR1L       = 0xA0;

    _Timer1Counter++;

    if (_Timer1Counter == 100) {
      _Timer1Counter = 0;

      if (LED_1 == STATE_LOW) {
        LED_1 = STATE_HIGH;
      } else if (LED_1 == STATE_HIGH) {
        LED_1 = STATE_LOW;
      }

      if (LED_2 == STATE_LOW) {
        LED_2 = STATE_HIGH;
      } else if (LED_2 == STATE_HIGH) {
        LED_2 = STATE_LOW;
      }
    }
  }
}

void activateOutputs() {
  switch (_PortState) {
    case 1:
      if (LED_1 == STATE_LOW) {
        LED_1 = STATE_HIGH;
      }
      break;

    case 2:
      if (LED_2 == STATE_LOW) {
        LED_2 = STATE_HIGH;
      }
      break;

    default:
      if (LED_1 == STATE_HIGH) {
        LED_1 = STATE_LOW;
      }

      if (LED_2 == STATE_HIGH) {
        LED_2 = STATE_LOW;
      }
      break;
  }
}

void main() {
  initMCU();

  initTimer0();
  initTimer1();

  EVERLOOP {
    DELAY_EVERLOOP;

    activateOutputs();
  }
}