// C++ code
/*
Programa 1: Utilizar a interrupção do WDT para piscar um led a cada 4 segundos 
*/

/* REFERENCE: 
 * 
 * LAB Name: Arduino Timer Compare Match Interrupt
 * Author: Khaled Magdy
 * For More Info Visit: www.DeepBlueMbedded.com
*/

/*
 * LAB Name: Arduino Timer Compare Match Interrupt
 * Author: Khaled Magdy
 * For More Info Visit: www.DeepBlueMbedded.com
*/

#define led_pin 7

volatile bool led_val = LOW;

ISR(TIMER1_COMPA_vect)
{
  OCR1A += 62500; // Advance The COMPA Register
  // Handle The Timer Interrupt
  led_val = !led_val; 
}

void setup()
{
  pinMode(led_pin, OUTPUT);

  Serial.begin(9600);

  TCCR1A = 0;           // Init Timer1A
  TCCR1B = 0;           // Init Timer1B
  TCCR1B |= B00000100;  // Prescaler = 256
  OCR1A = 62500;        // Timer Compare1A Register
  TIMSK1 |= B00000010;  // Enable Timer COMPA Interrupt
}

void loop()
{
  // Do Nothing
  Serial.println("led_val: " + (String)led_val);
  digitalWrite(led_pin, led_val);
}
/*
Aluno: Luiz Paulo Grafetti Terres
Data : Jun 14, 2024
Email: [email protected] || [email protected]
*/