Hello, I am new to Processing and I am having a minor problem with my code.  My problem is that the blinking is not consistent and is rather jerky.  What can I do to fix it?  The blinking in the code is set to a frequency of 3 hertz.  Here is my code:

1. // Adjustable flashing LED simulator
   // Can adjust to specific frequencies by use of millis()
   // Flashing is turned on/off by mouseclick
2. 
   
3. 
   boolean flag = false;  // false = not running, true = running
   int num = 1;
   int num1 = 0;
   
   void setup ()
   {
     frameRate(1000);  // 1000 frames per second
     background (175,252,255); // white background
     size(600,600);
     rect (300, 300, 5,5);  
   
   }            
   
   void mouseReleased ()
   {
     flag = !flag; // on or off at the press of mouse button
   }
      
   void draw ()
   {
   float m = millis() % 333.33; // 333.33 milli seconds == 3 hertz
    
     if ( flag )  // if true = on
     {
     // m counts up to ~333.33 and the resets.  This repeats
    
     println(m);
   
     while ( m < 300 )  // while loop wont exit until condition is false
       {
         fill (0); // fill the little box with black
         rect (300, 300, 5, 5 );
         m = millis() % 333.33; // 333.33 milli seconds == 3 hertz
       }
    
     if (m > 301)
       {
        fill(255) ;
        rect ( 300, 300, 5, 5 );
       }    
   } 
     
      else  // false = turn off the flashing
      {
        fill(0);  // go back to black
        rect ( 300,300,5,5);
      }
   
   }