// Rotary Encoder - XIAO ESP32-S3
// Interrupt-driven A/B channels

const int PIN_A = D1;
const int PIN_B = D2;
const int PIN_BTN = D3;

volatile long encoderPos = 0;
volatile unsigned long lastTime = 0;

void IRAM_ATTR handleEncoderA() {
  unsigned long now = micros();
  if (now - lastTime > 1000) {  // debounce
    if (digitalRead(PIN_A) == digitalRead(PIN_B)) {
      encoderPos++;
    } else {
      encoderPos--;
    }
    lastTime = now;
  }
}

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

  pinMode(PIN_A, INPUT_PULLUP);
  pinMode(PIN_B, INPUT_PULLUP);
  pinMode(PIN_BTN, INPUT_PULLUP);

  attachInterrupt(PIN_A, handleEncoderA, CHANGE);
}

void loop() {
  static long lastReported = 0;

  if (encoderPos != lastReported) {
    Serial.print("Encoder: ");
    Serial.println(encoderPos);
    lastReported = encoderPos;
  }

  if (digitalRead(PIN_BTN) == LOW) {
    Serial.println("Button Pressed");
    delay(200);
  }
}