Vehicle Forward method

[lemuus]

Hi,

I was playing a little bit with MonoBrick, and I noticed that when I use this method:

void MonoBrickFirmware.Movement.Vehicle.Forward ( sbyte speed )

The motors start running, but the method never returns, so you end up blocked in that call.
Is that the expected behavior? I would have thought that the idea of the method was to left the motors running at the given speed and return, to do for example, something like this:

var sensor = new EV3IRSensor(SensorPort.In4);
Vehicle vehicle = new Vehicle (MotorPort.OutB, MotorPort.OutC);
vehicle.ReverseLeft = false;
vehicle.ReverseRight = false;
vehicle.Forward (50);
while (true) 
{
  if (sensor.ReadDistance () < 40) 
  {
    vehicle.Brake ();
    vehicle.Off ();
    break;
  }
}

Thanks 🙂
Daniel.

[Anders Søborg]

Hi there

Yes I can see your problem. I already committed a fix. Until this will be official released simply start your call in a new thread like this.

new Thread(delegate() {
 vehicle.Forward (50);			
}).Start();

However please note that other functions also block for a reason. They return a waithandle so you can wait for the movement to finish. You can see an example of this here.

Thanks for pointing this out!

/Anders

[lemuus]

Hi,

I tried that solution, but now I get blocked on the vehicle.Brake() method.
I also tried to stop the thread with the Forward method, before calling the vehicle.Brake() method, but then I get a System.InvalidOperationException on the thread with the vehicle.Forward call.

Thank you,
Daniel.

[Anders Søborg]

Hi there

I will have a look at it tomorrow and upload a new version as soon as I have a fix. In the meantime use the motor sync class which is the class that the vehicle class is based on – or you could just wait a day or two…

/Anders

• This reply was modified 11 years ago by Anders Søborg.

[Anders Søborg]

Hi there

I have attached a new firmware dll with a fix. If you are using the Xamarin add-in simply replace the dll with the one attached. I will create a official release for this dll tomorrow.

/Anders

• This reply was modified 11 years ago by Anders Søborg. Reason: Attached file not accepted

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