Does setSrd() only work with interrupt? about invensense-imu HOT 3 CLOSED

#include <Arduino.h>
/*
Basic_SPI.ino
Brian R Taylor
[email protected]

Copyright (c) 2017 Bolder Flight Systems

Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
and associated documentation files (the "Software"), to deal in the Software without restriction, 
including without limitation the rights to use, copy, modify, merge, publish, distribute, 
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or 
substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include "MPU9250.h"

// an MPU9250 object with the MPU-9250 sensor on SPI bus 0 and chip select pin 10
MPU9250 IMU(SPI,16);
int status;

void setup() {
  // serial to display data
  Serial.begin(115200);
  while(!Serial) {}

  // start communication with IMU 
  status = IMU.begin();
  if (status < 0) {
    Serial.println("IMU initialization unsuccessful");
    Serial.println("Check IMU wiring or try cycling power");
    Serial.print("Status: ");
    Serial.println(status);
    while(1) {}
  }

  IMU.setSrd(9);

}

long time_flag1 = 0;
long time_flag2 = 0;
long time_sum = 0;
float record_counter = 0;

void loop() {
  // read the sensor
  if(IMU.readSensor())
  {
      // display the data
      IMU.getAccelX_mss();
      IMU.getAccelY_mss();
      IMU.getAccelZ_mss();
      IMU.getGyroX_rads();
      IMU.getGyroY_rads();
      IMU.getGyroZ_rads();
      IMU.getMagX_uT();
      IMU.getMagY_uT();
      IMU.getMagZ_uT();
      IMU.getTemperature_C();
      time_flag1 = time_flag2;
      time_flag2 = millis();
      time_sum += time_flag2 - time_flag1;
      record_counter++;
      Serial.printf("%f, %f\n", record_counter, time_sum / record_counter);
  }
  else Serial.println("Data not ready");
  //delay(100);
}

.
.
.
46287.000000, 2.070279
46288.000000, 2.070277
46289.000000, 2.070276
46290.000000, 2.070274
46291.000000, 2.070273
46292.000000, 2.070271
46293.000000, 2.070270