#include "pico/stdlib.h"
#define OUT true
#define IN false
#define KEYPAD_LEN 4
#pragma once

class Keypad {
private:
  // Start private attributes.
  uint *rows{};
  uint *cols{};
  char chars[4][4];
  // End private attributes.
  
  // Start private methods.
  void initCharArray(char chars[4][4]);
  void init();
  uint pressedColumn();
  void pullPinsDown(uint *pins);
  void restartPins();
  // End private methods.
public:
  // Start public methods.
  Keypad(uint *rows, uint *cols, char chars[4][4]);
  bool keyPressed();
  char getKey();
  // End public methods.
};