// Create 2 frames for the LED matrix
// Use a 2D array to hold the frame data for each frame
// Use a keyboard key to switch between the frames

//Anodes start at p2 and go to p5
int a1 = 2;
int a2 = 3;
int a3 = 4;
int a4 = 5;

//Cathodes start at p8 and go to p11
int c1 = 8;
int c2 = 9;
int c3 = 10;
int c4 = 11;

int xArray[4][4]  = {
  {
    1,0,0,1      }
  ,{
    0,1,1,0      }
  ,{
    0,1,1,0      }
  ,{
    1,0,0,1   }
}; 


int boxArray[4][4]  = {
  {
    1,1,1,1      }
  ,{
    1,0,0,1      }
  ,{
    1,0,0,1      }
  ,{
    1,1,1,1      }
}; 

int frame = 2;

void setup()
{
  Serial.begin(9600);
  pinMode(a1,OUTPUT);
  pinMode(a2,OUTPUT);
  pinMode(a3,OUTPUT);
  pinMode(a4,OUTPUT);
  pinMode(c1,OUTPUT);
  pinMode(c2,OUTPUT);
  pinMode(c3,OUTPUT);
  pinMode(c4,OUTPUT);
  Serial.println("STARTED");
}


void loop()
{
  checkSerial();
  
  if (frame == 1)      //SHOW ME THE X!!!
  {
    for (int x=0;x<4;x++) {
      // for loops:  create the variable and set it!
      //             check the test condition 
      //             if the test is true, INCREMENT
      for (int y = 0; y<4;y++)
      {
        if (xArray[x][y] == 1) {
          allOff();
          digitalWrite(x+2,HIGH);      //SET the anode to HIGH!
          digitalWrite(y+8,LOW);       //Set the cathode to LOW!
        }      
      } 
    }
  } 
  else if (frame == 2) {          //SHOW ME THE BOX!!!
    for (int i=0;i<4;i++) {
      for (int j = 0; j<4;j++)
      {
        allOff();
        if (boxArray[i][j] == 1) {
          digitalWrite(i+2,HIGH);
          digitalWrite(j+8,LOW);
        }      
      } 
    }

  }
}

void allOff()
{
  digitalWrite(a1,LOW);
  digitalWrite(a2,LOW);
  digitalWrite(a3,LOW);
  digitalWrite(a4,LOW);
  digitalWrite(c1,HIGH);
  digitalWrite(c2,HIGH);
  digitalWrite(c3,HIGH);
  digitalWrite(c4,HIGH);
}

void checkSerial()
{
  byte inByte = 0;
  if (Serial.available() > 0)
  {
    inByte = Serial.read();
    Serial.println(inByte);
  }
  if (inByte == '1') {
    frame = 1; 
  } 
  else if (inByte == '2') {
    frame = 2; 
  }


}