arduino led matrix

#include <Tlc5940.h>
#include <Wire.h>

#define EXPANDER B0100000

static unsigned long timerDuration;

void setup(){
  Tlc.init();
  Wire.begin(EXPANDER);
  timerDuration = micros() + 100;
}

byte pattern[8][2] = {
  {B10000011,B11001100},
  {B10000010,B00001010},
  {B10000010,B00001001},
  {B10000010,B00001001},
  {B10000011,B10001001},
  {B10000010,B00001001},
  {B10000010,B00001010},
  {B11110011,B11001100}};

void loop(){
  if((long)(micros() - timerDuration) >= 0){
    timer_Tick();
    timerDuration = micros() + 100;
  }
}

void sendByte(int adress, int data){
  Wire.beginTransmission(EXPANDER);
  Wire.write(data);
  Wire.endTransmission();
}

int counter = 0;

void timer_Tick(){
  if(counter > 7){
    counter = 0;
  }

  sendByte(EXPANDER, 255);
  Tlc.clear();

  for(int i = 0; i <= 1; i++){
    for (byte pos = 0, mask = B10000000; mask > 0; mask >>= 1){
      if (pattern[counter][i] & mask){
        if(i == 0){
          Tlc.set(pos, 4095);
        }
        else{
          Tlc.set(pos + 8, 4095);
        }
      }
      pos++;
    }
  }

  Tlc.update();
  delay(1);
  sendByte(EXPANDER, ~(1 << counter));

  counter++;
}