#include "LedControl.h"

// Pin configuration for the MAX7219 driver
const int DIN_PIN = 11;  // Data in
const int CS_PIN = 10;   // Chip select
const int CLK_PIN = 13;  // Clock

LedControl lc = LedControl(DIN_PIN, CLK_PIN, CS_PIN, 1);

void setup() {
  // Initialize the MAX7219
  lc.shutdown(0, false);
  lc.setIntensity(0, 8);
  lc.clearDisplay(0);
}

void scrollSmileyLeft(int delayTime) {
  byte smiley[8] = {
    B00111100,
    B01000010,
    B10100101,
    B10000001,
    B10100101,
    B10011001,
    B01000010,
    B00111100
  };

  for (int col = 0; col <= 8; col++) {
    for (int row = 0; row <= 8; row++) {
      byte shiftedValue = (smiley[row] << col);
      lc.setRow(0, row, shiftedValue);
    }
    delay(delayTime);
  }
  for (int col = 8; col >= 0; col--) {
    for (int row = 8; row >= 0; row--) {
      byte shiftedValue = (smiley[row] >> col);
      lc.setRow(0, row, shiftedValue);
    }
    delay(delayTime);
  }
}

void loop() {
  scrollSmileyLeft(250);
}