Arduino Due PIxy i2c

#include <Wire.h>
#include <PixyI2C.h>

PixyI2C pixy;

void setup()
{
  Wire.begin();
  Serial.begin(9600);
  Serial.print("Starting...\n");
}

void loop()
{
  static int i = 0;
  int j;
  uint16_t blocks;
  char buf[32];

  blocks = pixy.getBlocks();

  if (blocks)
  {
    i++;

    if (i%50==0)
    {
      sprintf(buf, "Detected %d:\n", blocks);
      Serial.print(buf);
      for (j=0; j<blocks; j++)
      {
        sprintf(buf, "  block %d: ", j);
        Serial.print(buf);
        pixy.blocks[j].print();
      }
    }
  }

}