Example code does not work

[spacey-sooty]

I have compiled the example code and downloaded it on my EV3 and it doesn't move the motor. I have tried to use other methods of moving the motors but it is not working.

[pixix4]

Can you give some more information about what you tried? My first ideas would be:

• Is the motor correctly connected to the right port and visible within the ev3 menu?
• Is the motor speed set to a sufficiently high value?
• Did the program exit before the motors could execute the commands?
  • Did an error occur and the run command could not be execute?
  • Die the program wait for the command to start/finish?

[spacey-sooty]

In my attempt to fix the example code I used these values

• The speed is set to 300 (using set_speed_sp)
• the time is set to 1000 ms (using set_time_sp)
• motor is being called using run_timed with a duration from seconds 10
  There was no error, the program did execute. The motor is correctly connected I will check if it is visible within the menu.
  From my observation the program did not wait for the command to start or finish
  @pixix4

[pixix4]

Can you post your code? Then I can try to check for bugs in the library on the weekend.

[spacey-sooty]

main.rs

extern crate ev3dev_lang_rust;

use ev3dev_lang_rust::Ev3Result;
use ev3dev_lang_rust::motors::{LargeMotor, MotorPort};

fn main()  -> Ev3Result<()> {
    let large_motor = LargeMotor::get(MotorPort::OutA)?;

    large_motor.set_speed_sp(300)?;

    large_motor.set_time_sp(1000)?;

    large_motor.run_timed(Some(std::time::Duration::from_secs(10)))?;

    Ok(())
}

I also tried using large_motor.run_forever()?;

[pixix4]

Sorry for the late reply, but I couldn't reproduce your problem. After I started this sample program, the A motor spun for 10 seconds. As you mentioned, the program didn't wait for the motor to finish. At the moment I can only guess that there is a service that automatically stops all motors after the program finishes (to prevent unintentional movements). To test this, you could try adding a wait time at the end. Or you could explicitly wait until the motor finishes spinning with “large_motor.wait_until_not_moving(None);”.

Regardless, the run_timed and run_forever commands seem to work as expected. As a minor node: The duration parameter of run_timed overrides the set_time_sp call. So in your example the motor ignores the time setpoint of 1000 ms and runs for 10 seconds.

[spacey-sooty]

Right thank you for the help I will see if I can figure this out over the week