#include <SPI.h>
#include <SD.h>
// Your wiring
#define SD_MISO D9
#define SD_MOSI D10
#define SD_SCK  D8
#define SD_CS   D7

SPIClass spi = SPIClass(HSPI);  // use HSPI so we can assign pins

void setup() {
  Serial.begin(115200);
  while (!Serial) {}
  // Initialize custom SPI bus
  spi.begin(SD_SCK, SD_MISO, SD_MOSI, SD_CS);
  if (!SD.begin(SD_CS, spi)) {
    Serial.println("Card failed, or not present");
    return;
  }
  Serial.println("SD card initialized.");

  // --- Write to file ---
  File file = SD.open("/myname.txt", FILE_WRITE);
  if (file) {
    file.println("Ankit Bhurane");  // write name
    file.close();
    Serial.println("Name written to myname.txt");
  } else {
    Serial.println("Error opening file for writing");
  }

  // --- Read back file ---
  file = SD.open("/myname.txt", FILE_READ);
  if (file) {
    Serial.println("Reading back file contents:");
    while (file.available()) {
      Serial.write(file.read());  // print character by character
    }
    file.close();
    Serial.println("\nDone reading.");
  } else {
    Serial.println("Error opening file for reading");
  }
}

void loop() {
  // Nothing here
}