#include <SPI.h>

const int DIN_PIN = 51;   // Pin SPI MOSI (Data In)
const int CS_PIN = 53;    // Pin Chip Select
const int CLK_PIN = 52;   // Pin SPI Clock
const int TombolA = 2;
const int TombolB = 3;

int count = 0; // Variabel untuk menghitung

byte numbers[][8] = {
  { B00011100, B00100010, B00100010, B00100010, B00100010, B00100010, B00011100 }, // 0
  { B00001000, B00001100, B00001000, B00001000, B00001000, B00001000, B00011100 }, // 1
  { B00111000, B01001000, B01000000, B00100000, B00010000, B00001000, B01111000 }, // 2
  { B00111000, B01001000, B01000000, B01100000, B01000000, B01000000, B00111000 }, // 3
  { B00001000, B00011000, B00010100, B00010010, B00011110, B00010000, B00010000 }, // 4
  { B01111000, B00001000, B00001000, B00111000, B01000000, B01001000, B00110000 }, // 5
  { B00110000, B01001000, B00001000, B00111000, B01001000, B01001000, B00110000 }, // 6
  { B01111000, B01000000, B00100000, B00010000, B00001000, B00001000, B00001000 }, // 7
  { B00110000, B01001000, B01001000, B00110000, B01001000, B01001000, B00110000 }, // 8
  { B00110000, B01001000, B01001000, B01110000, B01000000, B01000000, B00110000 }  // 9
};

void setup() {
  pinMode(DIN_PIN, OUTPUT);
  pinMode(CS_PIN, OUTPUT);
  pinMode(CLK_PIN, OUTPUT);
  pinMode(TombolA, INPUT_PULLUP); // Tombol A sebagai input pull-up
  pinMode(TombolB, INPUT_PULLUP); // Tombol B sebagai input pull-up

  SPI.begin();
}

void loop() {
  int statusTombolA = digitalRead(TombolA);
  int statusTombolB = digitalRead(TombolB);

  if (statusTombolA == LOW) { // Tombol A ditekan
    displayNumber(count);
    delay(200);
    count++;
    if (count > 9) {
      count = 0;
    }
  }

  if (statusTombolB == LOW) { // Tombol B ditekan
    displayNumber(count);
    delay(200);
    count--;
    if (count < 0) {
      count = 9; // Kembali ke 9 jika count kurang dari 0
    }
  }
}

void sendCommand(byte address, byte data) {
  // Send a command to the MAX7219
  digitalWrite(CS_PIN, LOW);
  SPI.transfer(address);
  SPI.transfer(data);
  digitalWrite(CS_PIN, HIGH);
}

void displayNumber(int num) {
  if (num >= 0 && num <= 9) {
    for (int digit = 1; digit <= 8; digit++) {
      sendCommand(digit, numbers[num][digit - 1]);
    }
  }
}