//Next things to do

//Work through pins - Address pins next!!






int clockS= LOW;

//pin assignments

//Pin fOr the clock generation (would normally be a crystal oscillator, so this simulates an oscillator)
const int clockPin = 23;  

//Test pin for showing an output when testing
const int testPin = 53;

//the switch connect to pin 12
const int switchPin = 25; 

const int buttonPin = 27;  // the number of the pushbutton pin

//Clock speed in hz
const float clockSpeed = 1; 

const float interval = 1 / clockSpeed * 500;

//initialise the var to store previous time in the clock function
unsigned long long previousMillis = 0;

//initialise the var to store current time in the clock function
unsigned long long currentMillis = 0;

//initialise the var state of the clock as low
int clockState = LOW;

int switchState = LOW;         // variable for reading the pushbutton status

int buttonState = LOW;  // variable for reading the pushbutton status

//Variable function for the clock
int clock(long clockSpeed){

  //store the current number of mS since starting the arduino in a variable
  currentMillis = millis();

  //check if half interval has passed, if it has then change the clockState (half interval as clock cycle is HIGH to HIGH)
  if (currentMillis - previousMillis >= interval) {


    previousMillis = currentMillis;
    
    if (clockState == LOW) {
      clockState = HIGH;
      digitalWrite(clockPin, HIGH);
    } else {
      clockState = LOW;
      digitalWrite(clockPin, LOW);
    }
    
    return clockState;

  } 

}


void setup() {

  //set pinMode for each pin
  pinMode(clockPin, OUTPUT);
  pinMode(testPin, OUTPUT);
  pinMode(switchPin, INPUT); //initialize thebuttonPin as input
  pinMode(buttonPin, INPUT);

}

void loop() {
  //run the clock


  switchState = digitalRead(switchPin);
  buttonState = digitalRead(buttonPin);


  if (switchState == HIGH ) //if it is,the state is HIGH
    {
    int clockState = clock(clockSpeed); 
    digitalWrite(testPin, HIGH); //turn the led on
    }
    else
    {
      digitalWrite(testPin, LOW); //turn the ledoff


    if (buttonState == HIGH) 
      {
        if (clockState == LOW) 
          {
          clockState = HIGH;
          digitalWrite(clockPin, HIGH);
          } 
        else 
          {
          clockState = LOW;
          digitalWrite(clockPin, LOW);
          }
      } 




    }





}