#include <LiquidCrystal.h>
#include <string.h>
const int rs =12,en=11,d4=5,d5=4,d6=3,d7=2;
int A,B,C,D,E,H,L = 0x0;
//int S,Z,AC,Carry
int flags[4] = {0,0,0,0};
//memory array
int memory[60] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
//push button,execute,enter
int pushButton = 18;
int execute = 19;

volatile boolean character_changed = false;
//int enter = ;
///////////////////////////
int executeState = 0;
int enterState = 0;
//always high pin
int alwayshigh = 34;
boolean high_led = false;
//The array of states
int state = 1; //this is needed to take input from user using the push button
int states[2] = {0,1};//1=Write,0=Read

//the array for characters to take input
char instructionChars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,";
char currentCharacter = 'A';
/////////////////////////////////////////////////////

int currentCursor[] = {0,0};
void setup() {
  // put your setup code here, to run once:
  pinMode(pushButton,INPUT_PULLUP);
  pinMode(execute,INPUT);
//  pinMode(enter,INPUT);
pinMode(50,OUTPUT);
  pinMode(alwayshigh,OUTPUT);
  digitalWrite(alwayshigh,HIGH);
  lcd.begin(16,2);
  lcd.print("8085 Simulator");
  delay(2000);
  lcd.clear();
  lcd.setCursor(6,0);
  attachInterrupt(digitalPinToInterrupt(pushButton), changecharacter, RISING);

  for(int i =0;i<=3;i++){
    lcd.print(flags[i]);
  }
  lcd.setCursor(16,1);
  currentCursor[0] = 16;
      lcd.setCursor(0,1);
      lcd.print("Char No  ");
      lcd.setCursor(8,1);
      lcd.print("0");
      lcd.setCursor(10,1);
      lcd.print(currentCharacter);
}

//The ISR of the pushbutton
void changecharacter()
{
character_changed=true;
}
///////////////////////////////

//The ISR of the the execute
// void executefunction(){
  
//   delay(100);
// }
//////////////////////////////////
//The ISR of enter
// void enter(){

// }
int blinkingCharacter(char character,int x,int y){
  while(enterState == 0){
    lcd.setCursor(x,y);
    lcd.print(character);
    delay(100);
    lcd.print(" ");
  }
}
void loop() {
  // put your main code here, to run repeatedly:

if (character_changed)
{
   high_led=!high_led;
   digitalWrite(50,high_led);
   
    for(int i=0;i<=36;i++)
    {
    if (instructionChars[i] == currentCharacter)
      {
      if (i > 36) i=0;  
      
      lcd.setCursor(0,1);
      lcd.print("Char No  ");
      lcd.setCursor(8,1);
      lcd.print(i);
      lcd.setCursor(10,1);
      currentCharacter = instructionChars[i+1];
      lcd.print(currentCharacter);
      break;
      }
    }
    character_changed=false;
    currentCursor[0] -= 1;

}

 
}