size_t SoftwareSerial::write(uint8_t b) {
  if (!m_txValid) return 0;

  if (m_invert) b = ~b;
  if (!m_intTxEnabled)
    // Disable interrupts in order to get a clean transmit
    cli();
  if (m_txEnableValid) digitalWrite(m_txEnablePin, HIGH);
  unsigned long wait = m_bitTime;
  digitalWrite(m_txPin, HIGH);
  unsigned long start = ESP.getCycleCount();
  // Start bit : HIGH if inverted logic, otherwise LOW
  digitalWrite(m_txPin, m_invert);
  //------------------------
  WAIT;
  for (int i = 0; i < 8; i++) {
    digitalWrite(m_txPin, (b & 1) ? HIGH : LOW);
    WAIT;
    b >>= 1;
  }
  // Stop bit : LOW if inverted logic, otherwise HIGH
  digitalWrite(m_txPin, !m_invert);
//----------------------------
  WAIT;
  if (m_txEnableValid) digitalWrite(m_txEnablePin, LOW);
  if (!m_intTxEnabled)
    sei();
  return 1;
}