#include <LiquidCrystal_I2C.h>
#define CLK 2
#define Q7 3
#define Q6 4
#define Q5 5
#define Q4 6
#define Q3 7
#define Q2 8
#define Q1 9
#define Q0 10

LiquidCrystal_I2C lcd(0x27, 20, 4);

bool a = 0;
bool b = 0;
bool c = 0;
bool d = 0;
bool e = 0;
bool f = 0;
bool g = 0;
bool h = 0;
bool Display = 0;
bool DisplaySet = 1;
bool resetStatus = 1;


String SumCH = "0 0 0 0 0 0 0 0";

String DataRow1 = " ";
String DataRow2 = " ";
String DataRow3 = " ";

uint8_t times = 0; String text = "";



void writeLCD(String dataIn, String dataIn2) {

  DataRow1 = DataRow2;
  DataRow2 = DataRow3;
  DataRow3 = dataIn + "  " + dataIn2;

  lcd.setCursor(0,0);
    lcd.print("A B C D E F G H  CLK");
  lcd.setCursor(0,1);
    lcd.print(String(DataRow1));
  lcd.setCursor(0,2);
    lcd.print(String(DataRow2));
  lcd.setCursor(0,3);
    lcd.print(String(DataRow3));

}

void displaySet(){
  lcd.setCursor(3,0);
  lcd.print("No CLK Trigger");

  lcd.setCursor(0,2);
  lcd.print(" A B C D E F G H CLK");
  lcd.setCursor(0,3);
  lcd.print("10 9 8 7 6 5 4 3   2");

}


void countTime() {

  if(times != 255) {times++;}
  else{times = 1;}

  if(times < 10) {text = ""; text = String(times) + "  ";}
  else if(times < 100 && times >= 10) {text = ""; text = String(times) + " ";}
  else if(times >= 100) {text = ""; text = String(times);}
  
}


void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();

  pinMode(CLK , INPUT);

  for(uint8_t pin = Q7; pin<=10; pin++) {
    pinMode(pin, INPUT);
  }

  displaySet();

  attachInterrupt(digitalPinToInterrupt(CLK), trig1, RISING); // CLK pin 2


}

void trig1() {

  DisplaySet = 0;
  
  a = digitalRead(Q0);
  b = digitalRead(Q1);
  c = digitalRead(Q2);
  d = digitalRead(Q3);
  e = digitalRead(Q4);
  f = digitalRead(Q5);
  g = digitalRead(Q6);
  h = digitalRead(Q7);

  Display = 1;
  
}

void loop() { 

  if(DisplaySet == 0 && resetStatus == 1) {
    lcd.clear();
    resetStatus = 0;
  }

  if(Display == 1) {
    countTime();
    SumCH = "";
    SumCH = String(a) + " " + String(b) + " " +  String(c) + " " +  String(d) + " " 
    + String(e) + " " + String(f) + " " +  String(g) + " " +  String(h);

    writeLCD(SumCH, text);

    Display = 0;
  }

}