/***************************************************
  This is a library for our I2C LED Backpacks

  Designed specifically to work with the Adafruit 16x8 LED Matrix backpacks
  ----> http://www.adafruit.com/products/2035
  ----> http://www.adafruit.com/products/2036
  ----> http://www.adafruit.com/products/2037
  ----> http://www.adafruit.com/products/2038
  ----> http://www.adafruit.com/products/2039
  ----> http://www.adafruit.com/products/2040
  ----> http://www.adafruit.com/products/2041
  ----> http://www.adafruit.com/products/2042
  ----> http://www.adafruit.com/products/2043
  ----> http://www.adafruit.com/products/2044
  ----> http://www.adafruit.com/products/2052

  These displays use I2C to communicate, 2 pins are required to
  interface. There are multiple selectable I2C addresses. For backpacks
  with 2 Address Select pins: 0x70, 0x71, 0x72 or 0x73. For backpacks
  with 3 Address Select pins: 0x70 thru 0x77

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

Adafruit_8x16matrix matrix0 = Adafruit_8x16matrix();
Adafruit_8x16matrix matrix1 = Adafruit_8x16matrix();

void setup() {
  Serial.begin(9600);
  Serial.println("16x8 LED Matrix Test: Carousel");

  matrix0.begin(0x70);  // pass in the matrix0 address
  matrix0.setBrightness(15);

  matrix1.begin(0x71);  // pass in the matrix1 address
  matrix1.setBrightness(15);

}

int8_t x,y,z;

static const uint8_t PROGMEM
  stripes14_bmp[] =
  {
    B00010001,  
    B00100010,  
    B01000100,  
    B10001000,  
    B00010001,  
    B00100010,  
    B01000100,  
    B10001000,  
    B00010001,  
    B00100010,  
    B01000100,  
    B10001000,  
    B00010001,  
    B00100010,  
    B01000100,  
    B10001000,  
    B00010001,  /* add 3 extra rows */
    B00100010,  /* for pointer loop */
    B01000100
  };

static const uint8_t PROGMEM
  random8_bmp[] =
  {
    B10000011,    /* 0 */
    B01001001,    /* 1 */
    B00001100,    /* 2 */
    B10110000,    /* 3 */
    B00010001,    /* 4 */
    B00100010,    /* 5 */
    B01011000,    /* 6 */
    B10010100,    /* 7 */
    B00010010,    /* 8 */
    B01000101,    /* 9 */
    B00101000,    /* 10 */
    B10000011,    /* 11 */
    B00100100,    /* 12 */
    B10010010,    /* 13 */
    B00100001,    /* 14 */
    B01001010,    /* 15 */
    B00000110,    /* 16 */
    B01001100,    /* 17 */
    B00110000,    /* 18 */
    B10010100,    /* 19 */
    B10100001,    /* 20 */
    B00000101,    /* 21 */
    B01010001,    /* 22 */
    B00100010,    /* 23 */
    B00001001,    /* 24 */
    B01101000,    /* 25 */
    B00000011,    /* 26 */
    B10010010,    /* 27 */
    B00001010,    /* 28 */
    B01100100,    /* 29 */
    B00000110,    /* 30 */
    B00011000     /* 31 */
  };

static const int8_t
  random16_index[] =
  {
    8, 5, 12, 15, 2, 6, 7, 1, 9, 4, 11, 0, 10, 3, 13, 14
  };

void loop() {

  /* all on */
  matrix0.clear();
  matrix0.fillRect(0,0, 8,16, LED_ON);
  matrix0.writeDisplay();

  matrix1.clear();
  matrix1.fillRect(0,0, 8,16, LED_ON);
  matrix1.writeDisplay();

  delay(7500);

  for (x=0; x<8; x++) {

    /* all on */
    matrix0.clear();
    matrix0.fillRect(0,0, 8,16, LED_ON);
    matrix0.writeDisplay();

    matrix1.clear();
    matrix1.fillRect(0,0, 8,16, LED_ON);
    matrix1.writeDisplay();

    delay(750);

    /* all off */
    matrix0.clear();
    matrix0.writeDisplay();

    matrix1.clear();
    matrix1.writeDisplay();

    delay(750);
  }

  /* stripes */
  x=0;
  y=0;
  for (z=0; z<80; z++) {
    
    matrix0.clear();
    matrix0.drawLine((7-x),0, (7-x),15, LED_ON);
    matrix0.writeDisplay();

    matrix1.clear();
    matrix1.drawLine((7-y),0, (7-y),15, LED_ON);
    matrix1.writeDisplay();

    x++; if (x > 7) { x=0; }
    y++; if (y > 5) { y=0; }

    delay(150);
  }

  /* two diagonal stripes */
  
  for (y=0; y<10; y++) {
    for (x=0; x<4; x++) {

      matrix0.clear();
      matrix0.drawBitmap(0, 0, (stripes14_bmp+x), 8, 16, LED_ON);
      matrix0.writeDisplay();

      matrix1.clear();
      matrix1.drawBitmap(0, 0, (stripes14_bmp+x), 8, 16, LED_ON);
      matrix1.writeDisplay();

      delay(300);
    }
  }

  /* pseudorandom */ 
  y = 0;
  for (z=0; z<80; z++) {

    x = random16_index[y];

    matrix0.clear();
    matrix0.drawBitmap(0, 0, (random8_bmp+x), 8, 16, LED_ON);
    matrix0.writeDisplay();

    matrix1.clear();
    matrix1.drawBitmap(0, 0, (random8_bmp+x), 8, 16, LED_ON);
    matrix1.writeDisplay();

    y++; if (y > 15) { y=0; }

    delay(150);

  }

  /* all off */
  matrix0.clear();
  matrix0.writeDisplay();

  matrix1.clear();
  matrix1.writeDisplay();

  delay(4000);

}