Looking for a Special Delay Library

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6

You can do that by one or several counters decrements by a timer interrupts.

Here the code to initialize and handle the interrupt :

volatile unsigned long myCounter = 0;

void setup()
{
  TCCR1B = (TCCR1B & ~_BV(WGM13)) | _BV(WGM12);                  // Set CTC mode (Clear Timer on Compare Match)
  TCCR1A = TCCR1A & ~(_BV(WGM11) | _BV(WGM10));                  // ...
  TCCR1B = (TCCR1B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10);      // No prescaler
  OCR1A = 160;                                                   // Set the compare register (16e6 Hz / 100000 Hz = 160) for 10 uS
  TIMSK1 |= _BV(OCIE1A);                                         // Enable interrupt when TCNT1 == OCR1A 
}

ISR(TIMER1_COMPA_vect)
{
   if (myCounter)
   {
      myCounter--;
   }
}

Then in your loop you can initialize the counter(s) to execute or not execute parts of code :

void loop()
{
    // code always execute
    // ...
    // ...
    
    if (!myCounter)
    {
        // code execute only each 2 milliseconds
        // ...
        // ...
        myCounter = 200 // value for 2 milliseconds
    }
    
    // code always execute
    // ...
    // ...
    
}

JLB