#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


#include "Adafruit_Keypad.h"

#define KEYPAD_PID3844

#define R1    2
#define R2    3
#define R3    4
#define R4    5
#define C1    6
#define C2    7
#define C3    10
#define C4    18

#include "keypad_config.h"

//initialize an instance of class NewKeypad
Adafruit_Keypad customKeypad = Adafruit_Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  Serial.begin(9600);

  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  display.clearDisplay();
  display.setTextSize(1);           
  display.setTextColor(SSD1306_WHITE);      
  display.setCursor(0,0); 
  display.println("demo!!!!");
  display.display();

  customKeypad.begin();
}


void loop() {
  // put your main code here, to run repeatedly:
  customKeypad.tick();

  while(customKeypad.available()){
    
    display.clearDisplay();
    display.setCursor(0, 0);
    keypadEvent e = customKeypad.read();
    display.print((char)e.bit.KEY);
    if(e.bit.EVENT == KEY_JUST_PRESSED) display.println(" pressed");
    else if(e.bit.EVENT == KEY_JUST_RELEASED) display.println(" released");


    display.display();
  }

  delay(10);
}