#include <SPI.h>
#include <SD.h>

// Chip select pin for the SD card module
const int chipSelect = 10;

void setup() {
  // Start the serial communication
  Serial.begin(9600);
  Serial.println("Initializing SD card...");

  // Check if the SD card is present and can be initialized
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // Don't do anything more
    return;
  }
  Serial.println("Card initialized.");

  // Open a file for writing
  File dataFile = SD.open("example.txt", FILE_WRITE);

  // If the file is available, write to it
  if (dataFile) {
    dataFile.println("Hello, Wokwi!");
    dataFile.close(); // Close the file
    Serial.println("Writing to example.txt done.");
  } else {
    // If the file didn't open, print an error
    Serial.println("Error opening example.txt");
  }

  // Open the file for reading
  dataFile = SD.open("example.txt");
  if (dataFile) {
    Serial.println("example.txt contents:");
    // Read from the file until there's nothing else in it
    while (dataFile.available()) {
      Serial.write(dataFile.read());
    }
    dataFile.close(); // Close the file
  } else {
    // If the file didn't open, print an error
    Serial.println("Error opening example.txt");
  }
}

void loop() {
  // Nothing to do here
}