#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <qrcode.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup(void) {
  Serial.begin(115200);

  if(!display.begin(SSD1306_I2C_ADDRESS, OLED_RESET)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.display();
  delay(2000);
  display.clearDisplay();

  QRCode qrcode;
  uint8_t qrcodeBytes[qrcode_getBufferSize(1)];
  qrcode_initText(&qrcode, qrcodeBytes, 1, ECC_LOW, "Hello, QRCode!");

  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  for (uint8_t y = 0; y < qrcode.size; y++) {
    for (uint8_t x = 0; x < qrcode.size; x++) {
      if (qrcode_getModule(&qrcode, x, y)) {
        display.drawPixel(x, y, SSD1306_WHITE);
      }
    }
  }

  display.display();
}

void loop(void) {
  // Your loop code here
}