// --- Configuration Constants ---
const int pwmPin = 13;
const int frequency = 5000;
const uint8_t resolution = 8; // 0-255 range

// --- Calculated Values ---
const uint32_t maxDutyCycle = (1 << resolution) - 1; // For 8-bit, this is 255

// --- Helper Function ---
// Converts a percentage (0-100) to the raw duty cycle value
uint32_t percentageToDuty(float percentage) {
  // Clamp percentage
  if (percentage < 0.0) {
    percentage = 0.0;
  } else if (percentage > 100.0) {
    percentage = 100.0;
  }

  return (percentage / 100.0) * maxDutyCycle;
}

// ========================== SETUP ==========================
void setup() {
  Serial.begin(115200);
  Serial.println("ESP32 PWM with Percentage Control");

  ledcAttach(pwmPin, frequency, resolution);

  // Example: set 50% duty cycle using percentage
  uint32_t duty = percentageToDuty(50.0);

  ledcWrite(pwmPin, duty);

  Serial.printf("Duty (raw): %u / %u\n", duty, maxDutyCycle);
}

// ========================== LOOP ==========================
void loop() {
  delay(1000);
}