#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"
#ifndef _BV
#define _BV(bit) (1<<(bit))
#endif
Adafruit_LEDBackpack matrix = Adafruit_LEDBackpack();
uint8_t counter = 0;
void setup() {
  Serial.begin(9600);
  Serial.println("HT16K33 test");
  Wire.begin(21, 22);
  matrix.begin(0x70);  // pass in the address

}
void loop() {
  // paint one LED per row. The HT16K33 internal memory looks like
  // a 8x16 bit matrix (8 rows, 16 columns)
//   for (uint8_t i=0; i<8; i++) {
// // draw a diagonal row of pixels

//     matrix.displaybuffer[i] = _BV((counter+i) % 16) | _BV((counter+i+8) % 16)  ;
//   }

//uint16_t test1[8] = {1,1,1,0,1,1,0,0};
for (int i=0; i <8; i++)
matrix.displaybuffer[i] = 0b00110011;

  // write the changes we just made to the display
  matrix.writeDisplay();
  delay(100);
//  counter++;
//   if (counter >= 16) counter = 0;  
}