 byte isr_green[DEVICES_ARRAY_SIZES] = { 0, 0, 0, 0 }; // current sinker when on (0)
 byte isr_blue [DEVICES_ARRAY_SIZES] = { 0, 0, 0, 0 }; // current sinker when on (0)
 
-volatile bool DoRefresh = false;
-
 ISR(TIMER1_OVF_vect) 
 {
   TCNT1 = __TIMER1_MAX - __TIMER1_CNT;
-
-  //DISPLAY_ON;
 
   for(byte isr_cycle = 0; isr_cycle < MAX_BRIGHTNESS+1; ++isr_cycle) 
   {

  digitalWrite(SPI_DATA, LOW);

  pinMode(DISPLAY_PIN, OUTPUT);
 
  randomSeed(analogRead(0));
    

  //for(;;) { rainbow(); delay(100); }
  //runaround(); 
 
  //runGrid();
  
  checkSerial();
}

inline void set_led_red(byte x, byte y, byte red)     { *(ptrBrightness + RED(x, y)) = red; }
