Pros vex::task::sleep function doesn’t work

Programming Support VEXcode V5 Tech Support
1

I am trying to include vex::task::sleep(25); inside the while loop to multi-task during driver skills. I thought it is a default function just like the delay function. However, when I build it, it says that it is not defined within the scope. How can I fix this problem?

2

If you are doing this in a multi-threaded enviroment, then use this_thread::sleep() opposed to vex::task::sleep

3

Do I have to set up anything with this? Or it is just a default function?

4

You mention PROS in the topic title, are you using PROS or VEXcode ?

If VEXcode, then to add a delay use either

this_thread::sleep_for(10); // 10mS delay

or

task::sleep(10); // 10mS delay

they do exactly the same thing.

2 Likes
5

I am using pros. When I use task::sleep, it says that it is not defined within the scope.

6

well, yes, that’s because task::sleep is not a PROS API. A delay in PROS is

pros::delay(10);  // 10mS delay
3 Likes
7

Oh, then I might want to find another way through the problem that I am having now.

I have a nested while loop in the driver loop for manipulating the flywheel velocity. During skills run, it would take approx 4-6 sec to exit the loop (during this time the robot doesn’t move) and we want to eliminate this. Do you have any suggestions?

8

post the code so we can see what you are doing.

2 Likes
9 
void opcontrol() {

int intakestate = 0;
  int flywheelstate = 0;
  int revintakestate = 0;
 int expansion = 0;
 pusharm.set_value(0);

  while (true) {
if(master.get_digital_new_press(DIGITAL_L1) == 1){
   if (flywheelstate == 0) {
      flywheelstate = 1;

   flywheelControl2 (160,1.7);

   }
   else if(flywheelstate == 1) {
    flywheelstate = 0;
    flywheelmtr = 0;
   }
  }

}

the code for flywheelControl2

void flywheelControl2 (int targetSpeed, double skp) {
  float sensitivity = 0.5;
  float tolerance = 2;
  double currentSpeed = fabs(flywheelmtr.get_actual_velocity());
  double motorPower = 0;
  while (fabs(currentSpeed) > (targetSpeed + tolerance) || fabs(currentSpeed) < (targetSpeed - tolerance)) {
    //task_delay_until(20)
    if (currentSpeed > (targetSpeed + tolerance)) {
        motorPower = fabs(motorPower)/skp;
    }
    if (currentSpeed < (targetSpeed - tolerance)){
        motorPower = fabs(motorPower) + sensitivity;
    }
    currentSpeed =  fabs(flywheelmtr.get_actual_velocity());
    flywheelmtr.move_velocity(-motorPower);
    delay(20);
    }
  }
10

you are not spawning a new thread anywhere in the code you have provided.

if multi-tasking is your end goal, have a look at the docs i have linked below.

https://pros.cs.purdue.edu/v5/tutorials/topical/multitasking.html