#include <Arduino.h>
//#include "ssd1306.h"
#include <U8g2lib.h>

#define PIN_LED (2)
#define PIN_BT (0)
#define PIN_SDA (21) 
#define PIN_SCL (22) 

//SSD1306 display(0x3c, PIN_SDA, PIN_SCL);
U8X8_SSD1306_128X64_NONAME_HW_I2C display(PIN_SDA, PIN_SDA);

void setup()
{
  Serial.begin(74880);
  Serial.println("\nFirmware started");

  //display.init();
  display.begin();
  display.setPowerSave(0);
  display.setFont(u8x8_font_pxplusibmcgathin_f);
  //display.flipScreenVertically();
  //display.setFont(ArialMT_Plain_16);
  display.clear();
  display.drawString(0, 0, "Firmware started");  //x: from Left,  y from Top
  //display.drawLine(0,20,128,20);
  //display.drawLine(0,63,128,63);
  display.display();

  pinMode(PIN_LED, OUTPUT);
  digitalWrite(PIN_LED, HIGH);
  pinMode(PIN_BT, INPUT);
}

void loop()
{
  static bool blink = false;

  if (digitalRead(PIN_BT) == 0 && !blink)
  {
    display.clear();    
    Serial.println("Button pressed, starting LED blink");
    display.display();
    blink = true;
  }

  if (blink)
  {
    digitalWrite(PIN_LED, LOW);
    delay(1000);
    digitalWrite(PIN_LED, HIGH);
    delay(1000);
  }
}