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

// Define the new pin assignments
#define MOSI_PIN 23
#define MISO_PIN 19
#define SCK_PIN 18
#define CS_PIN 5

// DO (MISO) to GPIO 19
// GND to GND
// SCK to GPIO 18
// VCC to 3.3V
// DI (MOSI) to GPIO 23
// CS to GPIO 5

void setup() {
  Serial.begin(115200);

  // Initialize the SPI bus with the new pin assignments
  SPI.begin(SCK_PIN, MISO_PIN, MOSI_PIN, CS_PIN);

  // Initialize SD card
  if (!SD.begin(CS_PIN)) 
  {
    Serial.println("Card failed, or not present");
    return;
  }
  Serial.println("Card initialized.");

  // Open a file for writing
  File dataFile = SD.open("/example.txt", FILE_WRITE);
  if (dataFile)
  {
    dataFile.println("Hello, world!");
    dataFile.close();
    Serial.println("Data written to file.");
  }
  else 
  {
    Serial.println("Failed to open file for writing.");
  }

  // Open a file for reading
  dataFile = SD.open("/example.txt");
  if (dataFile) 
  {
    Serial.println("Reading from file:");
    while (dataFile.available()) 
    {
      Serial.write(dataFile.read());
    }
    dataFile.close();
  } 
  else 
  {
    Serial.println("Failed to open file for reading.");
  }
}

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