Conceptual question about Arduino's loop() "speed" in relation to Serial.print

is there relation between output serial port on arduino , time "spend" in each runloop?

i mean, if had this:

code: [select]

void loop ()
{
    // whole bunch of serial.print() , serial.println()
}

1) loop slow down depending on amount of data outputted serial port?
2) can measure speed running at?

these questions arise project idea had blink laser @ high frequency photoresistor not "blinks" , miss few. based on serial.print() output don't know actual run loops printed out or if skipped. or maybe other problem entirely questions still remain in head.

thanks!

quote from: ardilla on jun 25, 2013, 07:15 am

1) loop slow down depending on amount of data outputted serial port?

of course.

quote

2) can measure speed running at?

yes...

code: [select]

void loop( void )
{
  static unsigned long previous;
  unsigned long now;
  unsigned long delta;

  = micros();
  delta = - previous;
  previous = now;

  // delta = time spent in last call loop

  // stuff goes here
}


or...

code: [select]

void loop( void )
{
  static unsigned long previous;
  unsigned long now;
  unsigned long delta;

  // stuff goes here

  = micros();
  delta = - previous;
  previous = now;

  // delta = time spent in call loop
}


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