8x8_Dot_LED_Matrix.c

#define ROW_1 2
#define ROW_2 3
#define ROW_3 4
#define ROW_4 5
#define ROW_5 6
#define ROW_6 7
#define ROW_7 8
#define ROW_8 9
#define COL_1 10
#define COL_2 11
#define COL_3 12
#define COL_4 13
#define COL_5 A0
#define COL_6 A1
#define COL_7 A2
#define COL_8 A3

const byte rows[] = {
    ROW_1, ROW_2, ROW_3, ROW_4, ROW_5, ROW_6, ROW_7, ROW_8
};
const byte col[] = {
  COL_1,COL_2, COL_3, COL_4, COL_5, COL_6, COL_7, COL_8
};
byte GG[] = {B11110000,B10000000,B10110000,B10011111,B11111000,B00001011,B00001001,B00001111};

void setup()
{
    Serial.begin(9600);
    for (byte i = 2; i <= 13; i++)
        pinMode(i, OUTPUT);
    pinMode(A0, OUTPUT);
    pinMode(A1, OUTPUT);
    pinMode(A2, OUTPUT);
    pinMode(A3, OUTPUT);
}

void loop() {
drawScreen(GG);
}
 void  drawScreen(byte buffer2[])
 {
    for (byte i = 0; i < 8; i++)
     {
        digitalWrite(rows[i], HIGH);
        for (byte a = 0; a < 8; a++)
        {
          digitalWrite(col[a], (buffer2[i] >> a) & 0x01);
          delayMicroseconds(100);
          digitalWrite(col[a], 1);
        }
        digitalWrite(rows[i], LOW);
    }
}