Arduino non-blocking S.O.S blinker

#define DELAY_LIST_SIZE 18U
const uint16_t delayList[DELAY_LIST_SIZE] = {
   100, 150, 100, 150, 100, // S
   500,
   400, 150, 400, 150, 400, // O
   500,
   100, 150, 100, 150, 100, // S
   1500};

void timedToggle() {

  static uint16_t msLeft = 0;
  static uint8_t currentState = 0;
  static uint8_t delayListIndex = 0;

  // Have we waited long enough?
  if (0 == msLeft) {

    // Toggle LED state
    currentState = 1 - currentState;
    digitalWrite(13, currentState);

    // Get the next wait time
    msLeft = delayList[delayListIndex];
    delayListIndex++;
    // Restart if reached the end of the list
    if (DELAY_LIST_SIZE == delayListIndex) {
      delayListIndex = 0;
    }

  } else {
      msLeft--;
    }

}

void setup() {
  pinMode(13, OUTPUT);
}

void loop() {

  static uint32_t lastMillis = 0;

  // Call the LED toggling handler every 1ms
  if (millis() != lastMillis) {
    lastMillis = millis();
    timedToggle();
  }

}