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

// --- Choose your display size:
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32

// --- I2C address (0x3C is most common)
#define OLED_ADDR 0x3D

// --- Pick the pins you wired:
#define I2C_SDA 6
#define I2C_SCL 7

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

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

  // Start I2C on chosen pins
  Wire.begin(I2C_SDA, I2C_SCL);

  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
    Serial.println("SSD1306 allocation failed (wrong size/address/wiring?)");
    while (true) delay(10);
  }

  Serial.println("Scanning...");
  for (uint8_t addr = 1; addr < 127; addr++) {
    Wire.beginTransmission(addr);
    if (Wire.endTransmission() == 0) {
      Serial.print("Found I2C device at 0x");
      Serial.println(addr, HEX);
    }
  }

  display.clearDisplay();

  display.setTextSize(1);              // 1 = 6x8 font, 2 = 12x16, etc.
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Hello from");
  display.println("XIAO ESP32-C3!");

  display.display();                   // push buffer to the screen
}

void loop() {
  // nothing
}