teensy-sdfat/SdFat/examples/OpenNext/OpenNext.ino

/*
 * Print size, modify date/time, and name for all files in root.
 */
#include <SdFat.h>

// SD chip select pin
const uint8_t chipSelect = SS;

// file system object
SdFat sd;

SdFile file;
//------------------------------------------------------------------------------
void setup() {
  Serial.begin(9600);
  while (!Serial) {} // wait for Leonardo
  delay(1000);
  
  // initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
  // breadboards.  use SPI_FULL_SPEED for better performance.
  if (!sd.begin(chipSelect, SPI_HALF_SPEED)) sd.initErrorHalt();

  // open next file in root.  The volume working directory, vwd, is root
  while (file.openNext(sd.vwd(), O_READ)) {
    file.printFileSize(&Serial);
    Serial.write(' ');
    file.printModifyDateTime(&Serial);
    Serial.write(' ');    
    file.printName(&Serial);
    if (file.isDir()) {
      // Indicate a directory.
      Serial.write('/');
    }
    Serial.println();
    file.close();
  }
  Serial.println("Done!");
}
//------------------------------------------------------------------------------
void loop() {}