Method flush_rx

Marlin/src/gcode/queue.cpp:310–316

* arduinoststm32's USB receive buffer is not well behaved when the buffer overflows * * This can happen when the host programs (such as Pronterface) automatically * send M105 temperature requests. */

   * send M105 temperature requests.
   */
  void GCodeQueue::flush_rx() {
    // Flush receive buffer
    for (uint8_t p = 0; p < NUM_SERIAL; ++p) {
      if (!serial_data_available(p)) continue; // No data for this port? Skip.
      while (SERIAL_IMPL.available(p)) (void)read_serial(p);
    }
  }

#endif // (ARDUINO_ARCH_STM32F4 || ARDUINO_ARCH_STM32) && USBCON