void processAddressButtons()
{ 
  boolean curAddrUp = 0;
  boolean curAddrDown = 0;
  boolean curAddrFast = 0;
  
  // Get the active high current button state
  if (digitalRead(ADDR_UP_BUTTON) == LOW) {
    curAddrUp = 1;
  }
  if (digitalRead(ADDR_DOWN_BUTTON) == LOW) {
    curAddrDown = 1;
  }
  if (digitalRead(ADDR_FAST_BUTTON) == LOW) {
   curAddrFast = 1;
  }
  
  // Process AddrUp
  AddrUpPressed = curAddrUp & prevAddrUp & ~AddrUpDown;
  AddrUpDown = curAddrUp & prevAddrUp;
  prevAddrUp = curAddrUp;
  
  // Process AddrDown
  AddrDownPressed = curAddrDown & prevAddrDown & ~AddrDownDown;
  AddrDownDown = curAddrDown & prevAddrDown;
  prevAddrDown = curAddrDown;
  
  // Process AddrFast (we don't need the "just pressed" detection here)
  AddrFastDown = curAddrFast & prevAddrFast;
  prevAddrFast = curAddrFast;
  
  // Pressing both AddrUp and AddrDown resets us to 1
  if (AddrUpDown & AddrDownDown) {
    dmxaddress = 1+3;
  } else {
    // Process AddrUp (either bump it once or every time we execute this routine for fast mode)
    if (AddrUpPressed || (AddrUpDown & AddrFastDown)) {
      // AddrUp just pressed
      IncAddr();
    }

    // Process AddrDown
    else if (AddrDownPressed || (AddrDownDown & AddrFastDown)) {
      // AddrDown just pressed
      DecAddr();
    }
  }
}

// Inc/Dec Addr routines limit and account for the +3 offset in our dmxaddress variable
void IncAddr()
{
  if (dmxaddress < 512+3-7) {
    dmxaddress++;
  }
}

void DecAddr()
{
  if (dmxaddress > 1+3) {
    dmxaddress--;
  }
}