#include <TinyDebug.h>
#include <avr/io.h>
#include <avr/interrupt.h>

#define INTERRUPT_PIN PCINT1  // This is PB1 per the schematic
#define INT_PIN PB1           // Interrupt pin of choice: PB1 (same as PCINT1) - Pin 6
#define LED_PIN PB4           // PB4 - Pin 3
#define PCINT_VECTOR PCINT0_vect      // This step is not necessary - it's a naming thing for clarit

bool previousInterruptPinState = false; // false - low, true - high

int myLineCounter = 0;
void myDebugPrint(String message)
{
  Debug.print(String(myLineCounter));
  Debug.println(" :" + message);
  myLineCounter++;
}


void setup() {
  Debug.begin();
  myDebugPrint("Hello, TinyDebug!");

  pinMode(LED_PIN, OUTPUT);
  cli();                            // Disable interrupts during setup
  PCMSK |= (1 << INTERRUPT_PIN);    // Enable interrupt handler (ISR) for our chosen interrupt pin (PCINT1/PB1/pin 6)
  GIMSK |= (1 << PCIE);             // Enable PCINT interrupt in the general interrupt mask
  pinMode(INT_PIN, INPUT_PULLUP);   // Set our interrupt pin as input with a pullup to keep it stable
  sei();                            //last line of setup - enable interrupts after setup
}

void loop() {
  /* Sprinkle some magic code here */
  if ( previousInterruptPinState == HIGH ) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
}


// This is the interrupt handler called when there is any change on the INT_PIN
// ISR is defined in the headers - the ATtiny85 only has one handler
ISR(PCINT_VECTOR)
{
  myDebugPrint("ISR");
  // measure pin
  if (previousInterruptPinState != digitalRead(INT_PIN))
  {
    previousInterruptPinState = digitalRead(INT_PIN);
  }
}