Chief Delphi - Delay Function

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Slick

21-02-2007 08:38

Delay Function

Can someone show me a way to write a function that can delay the robot. I would like to write a function and put it in ‘user_routines.c’ and call it anywhere in my ‘user_routines_fast.c’ file. Simply I would like to:

{
pwm13 = 167;
pwm15 = 167;
delay = 100;
}

where ‘delay =’ would pause the robot for whatever time you gave it. Your help would be appreciated. What would the function look like? Thanks...

bear24rw

21-02-2007 09:15

Re: Delay Function

maybe somthing like this..

Code:

void delay(unsigned int seconds)

{

   unsigned int current = 0;

   while (current < (seconds * 1000) / 26.4) // Seconds * 1000 to get milliseconds and then / 26.4 millisecond loop

   {

      getdata(); // forget what parameter getdata takes

      current++;

      putdata(); // forget what parameter putdata takes..

   }

}

I have no idea if that will work but you can try it..

tdlrali

21-02-2007 12:38

Re: Delay Function

"Stalling" execution is generally a bad idea. I would make a "loopcounter" variable, and increase the counter every time the function runs. After a certain number of loops, make it do the next thing.

For example, here's our pump code:

Code:

void pump_routine(void) {



        static unsigned int loops = 0;   <--- Loop Counter



        if(BTN_PUMP_DISABLE) {



                if(DIGIN_PUMP_PRESSURE_SWITCH && loops>10) { <-- If more than ten loops have passed



                        RLY_PUMP_ON = 0;



                }



                else if(DIGIN_PUMP_PRESSURE_SWITCH) {



                        loops++; <-- Increase loop counter



                        RLY_PUMP_ON = 1;



                }



                else {



                        loops = 0;



                        RLY_PUMP_ON = 1;



                }



        }



        else {



                RLY_PUMP_ON = 0;



                loops = 0;



        }



        RLY_PUMP_NUL = 0;



}

Anime-niac_2.9

28-02-2007 17:54

Re: Delay Function

i've thought about it before, and it turns out something like bear24rw's idea.

Code:

int counter=0;



void User_Autonomous_Code(void)

{

  static unsigned int i;

  const float delay = 100;

  int counter, int limit=(delay*1000)*26.4;



  for(counter=0, counter<limit, counter++)

  {

  }

}

not necessarilly a function, but the interrupt code here (the for loop) should work. all you have to do if place the for loop whereever you want it

Dave K.

01-03-2007 02:15

Re: Delay Function

Quote:

Originally Posted by Slick (Post 583197)

... for autonomous no doubt.

Perhaps you will find some insight in this recent thread

I'd suggest structuring your autonomous code to run every 26ms (off the SPI data updates), tuck some timers into that, and structure you code as a state machine.

bear24rw

01-03-2007 20:17

Re: Delay Function

Quote:

Originally Posted by Anime-niac_2.9 (Post 587872)

i've thought about it before, and it turns out something like bear24rw's idea.

Code:

int counter=0;



void User_Autonomous_Code(void)

{

  static unsigned int i;

  const float delay = 100;

  int counter, int limit=(delay*1000)*26.4;



  for(counter=0, counter<limit, counter++)

  {

  }

}

not necessarilly a function, but the interrupt code here (the for loop) should work. all you have to do if place the for loop whereever you want it

You need to be carefull with that loop, you need to call putdata and getdata every so often so the master processor doesnt shut down.. i forget what the actual timeout is but its not very long...

TimCraig

01-03-2007 22:56

Re: Delay Function

Quote:

Originally Posted by Anime-niac_2.9 (Post 587872)

Code:

  const float delay = 100;

  int counter, int limit=(delay*1000)*26.4;

You do realize that the range for an int is -32,768 to +32,767?

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