uart baudrate change

[liqi-c]

Hi When i change baudrate to 921600 or others , it's useless , how i config is below :

 int baudrate = 921600;
 float frequency = 8.0;

  CYdLidar laser;
  //////////////////////string property/////////////////
  /// lidar port
  laser.setlidaropt(LidarPropSerialPort, port.c_str(), port.size());
  /// ignore array
  std::string ignore_array;
  ignore_array.clear();
  laser.setlidaropt(LidarPropIgnoreArray, ignore_array.c_str(),
                    ignore_array.size());

  //////////////////////int property/////////////////
  /// lidar baudrate
  laser.setlidaropt(LidarPropSerialBaudrate, &baudrate, sizeof(int));

  /// abnormal count
  int optval = 4;
  laser.setlidaropt(LidarPropAbnormalCheckCount, &optval, sizeof(int));

  //////////////////////bool property/////////////////
  /// fixed angle resolution
  bool b_optvalue = false;
  laser.setlidaropt(LidarPropFixedResolution, &b_optvalue, sizeof(bool));
  /// rotate 180
  laser.setlidaropt(LidarPropReversion, &b_optvalue, sizeof(bool));
  /// Counterclockwise
  laser.setlidaropt(LidarPropInverted, &b_optvalue, sizeof(bool));
  b_optvalue = true;
  laser.setlidaropt(LidarPropAutoReconnect, &b_optvalue, sizeof(bool));
  /// intensity
  b_optvalue = false;
  laser.setlidaropt(LidarPropIntenstiy, &b_optvalue, sizeof(bool));

  //////////////////////float property/////////////////
  /// unit: °
  float f_optvalue = 180.0f;
  laser.setlidaropt(LidarPropMaxAngle, &f_optvalue, sizeof(float));
  f_optvalue = -180.0f;
  laser.setlidaropt(LidarPropMinAngle, &f_optvalue, sizeof(float));
  /// unit: m
  f_optvalue = 8.f;
  laser.setlidaropt(LidarPropMaxRange, &f_optvalue, sizeof(float));
  f_optvalue = 0.05f;
  laser.setlidaropt(LidarPropMinRange, &f_optvalue, sizeof(float));
  /// unit: Hz
  laser.setlidaropt(LidarPropScanFrequency, &frequency, sizeof(float));


  bool ret = laser.initialize();

  if (ret) {
    laser.turnOn();
  }