//ENEL 301 - Lab 1

//libraries for LCD screen
#include <LiquidCrystal.h>
#include <Keypad.h>

const int rs=12, en=11, d4=5, d5=4, d6=3, d7=2; 
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const byte ROWS = 4; 
const byte COLS = 4; 

char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', '+'}, //Change A,B,C,D to operations and * to C (clear)
  {'4', '5', '6', '-'},
  {'7', '8', '9', 'x'},
  {'C', '0', '=', '/'}
};

byte rowPins[ROWS] = {14, 15, 16, 17}; 
byte colPins[COLS] = {18, 19, 20, 21}; 

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lcd.begin(16,2); //setup of lcd with rows, cols of screensize
  lcd.print("hello");

}

void loop() {
  // put your main code here, to run repeatedly:
  char customKey = customKeypad.getKey();
  
  //entering numbers prior to operations 
  
  if(customKey != ('+'||'-'||'x'||'/')){
      int displayCol = 0;
      while (displayCol < 4){
        lcd.setCursor(displayCol,0);
        lcd.print(customKey);
      }
  }

  /*if (customKey){
    //Serial.println(customKey);
    lcd.clear();
    lcd.setCursor(0, 0); 
    lcd.print(customKey);
  }*/
}