Procedure;
* If button held down for 1 second; hours++, secs = 0
  * then if still held down; hours++ again (now every half second)
  * when long press is released; mins will not change
* any quick press (after release); mins++, secs = 0

// Roman's easy "1-button" clock hours/mins setting system;

    // (this is done in a loop, about 12mS per loop)
    // CLOCK ADJUST button (lo = pressed)
    if(!PIN_BUT_ADJUST)
    {
      debounce++;
      
      // check for button HELD DOWN (adjust hours)
      if(debounce > 90)   // 90 is about 1.1 seconds
      {
        hours++;
        secs = 0;
        update_clock();     // format clock values
        display_clock();    // display to LCD
        debounce = 45;      // faster inc for next hour
      }
    }
    else   // else button is NOT pressed
    {
      // check for QUICK buttons press (adjust mins)
      if(debounce > 0 && debounce < 45)
      {
        mins++;
        secs = 0;
        update_clock();     // format clock values
        display_clock();    // display to LCD
      }
      debounce = 0;
    }