YDLiDAR X4 to arduino mega dosen't work, help!

[tsk04191]

i just upload code without lidar and serial monitor appeared "⸮⸮YDLIDAR get DeviceInfo Error!"

then i plug lidar to arduino, it spin little second and stop. alos monitor appeared nothing. how can i do?

hear my code

#include <YDLidar.h>

// You need to create an driver instance
YDLidar lidar;

bool isScanning = false;

#define YDLIDAR_MOTOR_SCTP 2 // The PWM pin for control the speed of YDLIDAR's motor.
#define YDLIDAR_MOTRO_EN 22 // The ENABLE PIN for YDLIDAR's motor

void setup() {

//f4,s4:115200
//g4:230400
//x4:128000
// bind the YDLIDAR driver to the arduino hardware serial
lidar.begin(Serial, 9600);
//output mode
pinMode(YDLIDAR_MOTOR_SCTP, OUTPUT);
pinMode(YDLIDAR_MOTRO_EN, OUTPUT);

while(Serial.read() >= 0){};

}

void loop() {
if(isScanning){
if (lidar.waitScanDot() == RESULT_OK) {
float distance = lidar.getCurrentScanPoint().distance; //distance value in mm unit
float angle = lidar.getCurrentScanPoint().angle; //anglue value in degree
byte quality = lidar.getCurrentScanPoint().quality; //quality of the current measurement
bool startBit = lidar.getCurrentScanPoint().startBit;
Serial.print("current angle:");
Serial.println(angle, DEC);
Serial.print("current distance:");
Serial.println(distance, DEC);
}else{
Serial.println(" YDLIDAR get Scandata fialed!!");
}
}else{
//stop motor
digitalWrite(YDLIDAR_MOTRO_EN, LOW);
setMotorSpeed(0);
restartScan();
}
}

void setMotorSpeed(float vol){
uint8_t PWM = (uint8_t)(51*vol);
analogWrite(YDLIDAR_MOTOR_SCTP, PWM);
}

void restartScan(){
device_info deviceinfo;
if (lidar.getDeviceInfo(deviceinfo, 100) == RESULT_OK) {
int _samp_rate=6;
String model;
float freq = 7.0f;
switch(deviceinfo.model){
case 1:
model="F4";
_samp_rate=4;
freq = 7.0;
break;
case 4:
model="S4";
_samp_rate=4;
freq = 7.0;
break;
case 5:
model="G4";
_samp_rate=9;
freq = 7.0;
break;
case 6:
model="X4";
_samp_rate=5;
freq = 7.0;
break;
default:
model = "Unknown";
}

      uint16_t maxv = (uint16_t)(deviceinfo.firmware_version>>8);
      uint16_t midv = (uint16_t)(deviceinfo.firmware_version&0xff)/10;
      uint16_t minv = (uint16_t)(deviceinfo.firmware_version&0xff)%10;
      if(midv==0){
        midv = minv;
        minv = 0;
      }

      
      Serial.print("Firmware version:");
      Serial.print(maxv,DEC);
      Serial.print(".");
      Serial.print(midv,DEC);
      Serial.print(".");
      Serial.println(minv,DEC);

      Serial.print("Hardware version:");
      Serial.println((uint16_t)deviceinfo.hardware_version,DEC);

      Serial.print("Model:");
      Serial.println(model);

      Serial.print("Serial:");
      for (int i=0;i<16;i++){
        Serial.print(deviceinfo.serialnum[i]&0xff, DEC);
      }
      Serial.println("");

      Serial.print("[YDLIDAR INFO] Current Sampling Rate:");
      Serial.print(_samp_rate,DEC);
      Serial.println("K");

      Serial.print("[YDLIDAR INFO] Current Scan Frequency:");
      Serial.print(freq,DEC);
      Serial.println("Hz");
      delay(100);
      device_health healthinfo;
      if (lidar.getHealth(healthinfo, 100) == RESULT_OK){
         // detected...
          Serial.print("[YDLIDAR INFO] YDLIDAR running correctly! The health status:");
          Serial.println( healthinfo.status==0?"well":"bad");
          digitalWrite(YDLIDAR_MOTRO_EN, HIGH);
          delay(500);
          if(lidar.startScan() == RESULT_OK){
            isScanning = true;
            //start motor in 1.8v
	            setMotorSpeed(1.8);
	            //digitalWrite(YDLIDAR_MOTRO_EN, HIGH);
            Serial.println("Now YDLIDAR is scanning ......");
          //delay(1000);
          }else{
              Serial.println("start YDLIDAR is failed!  Continue........");
          }
      }else{
          Serial.println("cannot retrieve YDLIDAR health");
      }

  
   }else{
         Serial.println("YDLIDAR get DeviceInfo Error!");
   }

}

[dduddaddidda]

Hi, did you fix it? I have same problem at exp32
YDLIDAR get DeviceInfo Error!!!