is the code in

https://github.com/m5stack/GoPlus/blob/master/src/src.ino

The actual code that it is shipped with? Apart from the fact that it is a bit of a mess, if i read it right then the dc motors should stop if you send a speed of 0

//duty_motor_num = motor_num;
if(motor_speed == 0){
if(motor_num == 0){

  digitalWrite(IN_0, 0);
  digitalWrite(IN_1, 0);
  duty_trun0 = trun;
  duty_speed0 =  motor_speed;
  //MsTimer2::stop(); 
  //time_flag = 0;
  duty0 = 0;
  duty_motor_0_flag = 0;

  //analogWrite(IN_0, 0);
  //analogWrite(IN_1, 0);
}else if(motor_num == 2)
{
 // digitalWrite(IN_2, 0);
  //digitalWrite(IN_3, 0);

  digitalWrite(IN_2, 0);
  digitalWrite(IN_3, 0);
  duty_trun1 = trun;
  duty_speed1 =  motor_speed;
  //MsTimer2::stop(); 
  //time_flag = 0;
  duty1 = 0;
  duty_motor_1_flag = 0;

  // analogWrite(IN_2, 0);
  // analogWrite(IN_3, 0);
} 

}

it seems like it shoudl first check if the motor speed is 0 and if that is true then check which motor is send. And if the motorspeed <> 0 then it should look at the direction etc.

But the motor never seems to stop... Can anybody confirm that this is a true?