/*
  Template for Arduino UNO with ATMega328P
  The Arduino framework uses some resources by default.
  Therefore we cannot use it in our code.

  1. Timer0 and its corresponding interrupts

*/
#include <Arduino.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include "macros.h"

#define LED_ON setBit(PORTB,Bit5)
#define LED_OFF clearBit(PORTB,Bit5)
#define LED_TOGGLE toggleBit(PORTB, Bit5)


// Timer1 Interrupt Service Routine
ISR (TIMER1_COMPA_vect){
  // enter on compare match A
  LED_TOGGLE;
}

int main(void)
{
  // to use the arduino millis() functions and other timing we need the next 3 lines
  TCCR0B = 0x03; // clk/64 (from prescaler) tTimer = 1µs@16Mhz
  TIMSK0 |= 0b00000001; // set enable overflow interrupt Timer0
  SREG |= 0b10000000; // Enable Global Interrupt 

  // Ports
  DDRB    = 0b00100000; // Built in LED as output
  // Timer1
  TCCR1B = 0b00001000; // Timer1 Stop
  ICR1 = 10;
  OCR1A = 15625/2;   // 0.5sec
  TCCR1A = 0x00; // no PWM, no OUTPUT
  TCCR1B = 0b00001101; // // CRC, Timer1 1:1024 Prescaler
  // Timer 1 Interrupt 
  TIMSK1 |= 0b00000010; // Output Compare A Match Interrupt Enable
  SREG |= 0b10000000; // Enable Global Interrupt 

  // Arduino functions to setup serial communication
  // https://docs.arduino.cc/language-reference/
  Serial.begin(19200);

  // our well known endless loop
  int counter = 0;
  unsigned int previous_millis = 0;
  while (1)
  {
    // Lets do some output on the serial monitor to show that it works
    if (millis() > previous_millis)
    {
      previous_millis = millis();
      if (millis() % 1000==0)
      { 
          Serial.print("Every second we count ");
          Serial.println(counter);
          counter++;
      }
    }
    
  }
}