/*
  by Dileepa Jayawardena
  ii.lk

*/
#include<FrequencyTimer2.h>

int rows[] = {2, 3, 4, 5, 6, 7, 8, 9};//Anode Pins (+)
int cols[] = {10, 11, 12, 13, A0, A1, A2, A3};//Cathode Pins (-)

int cells[8][8] = {
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
  {0, 0, 0, 0, 0, 0, 0, 0},
};

void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(rows[i], OUTPUT);
  }
  for (int i = 0; i < 8; i++) {
    pinMode(cols[i], OUTPUT);
  }
  FrequencyTimer2::disable();
  // Set refresh rate (interrupt timeout period)
  FrequencyTimer2::setPeriod(2000);
  // Set interrupt routine to be called
  FrequencyTimer2::setOnOverflow(display);
  
}

void loop() {
 
  for (int y = 0; y < 8; y++) {
   for (int x = 0; x < 8; x++) {
     clear();
      cells[x][y] = 1;
    
       delay(50);
    }
  }
 
}
void clear() {
  for (int x = 0; x < 8; x++) {
    for (int y = 0; y < 8; y++) {
      cells[x][y] = 0;
    }
  }

}

int py = 0;
void display() {
  digitalWrite(cols[py], HIGH);
  for (int px = 0; px < 8; px++) {
    digitalWrite(rows[px], LOW);
  }
  py++;
  if (py == 8) {
    py = 0;
  }
  digitalWrite(cols[py], LOW);

  for (int px = 0; px < 8; px++) {
    if (cells[px][py] == 1) {
      digitalWrite(rows[px], HIGH);
    } else {
      digitalWrite(rows[px], LOW);
    }
  }

}