listfiles.ino

/*
  Listfiles

  This example shows how print out the files in a
  directory on a SD card

  The circuit:
   SD card attached to SPI bus as follows:
 ** MOSI - pin 11
 ** MISO - pin 12
 ** CLK - pin 13
 ** CS - pin 4

  created   Nov 2010
  by David A. Mellis
  modified 9 Apr 2012
  by Tom Igoe
  modified 2 Feb 2014
  by Scott Fitzgerald

  This example code is in the public domain.

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

File root;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(115200);

  Serial.print("Initializing SD card...");

  if (!SD.begin(SS)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");

  root = SD.open("/");

  printDirectory(root, 0);

  Serial.println("done!");
}

void loop() {
  // nothing happens after setup finishes.
}

void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      // no more files
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\t\t");
      Serial.print(entry.size(), DEC);
      time_t cr = entry.getCreationTime();
      time_t lw = entry.getLastWrite();
      struct tm * tmstruct = localtime(&cr);
      Serial.printf("\tCREATION: %d-%02d-%02d %02d:%02d:%02d", (tmstruct->tm_year) + 1900, (tmstruct->tm_mon) + 1, tmstruct->tm_mday, tmstruct->tm_hour, tmstruct->tm_min, tmstruct->tm_sec);
      tmstruct = localtime(&lw);
      Serial.printf("\tLAST WRITE: %d-%02d-%02d %02d:%02d:%02d\n", (tmstruct->tm_year) + 1900, (tmstruct->tm_mon) + 1, tmstruct->tm_mday, tmstruct->tm_hour, tmstruct->tm_min, tmstruct->tm_sec);
    }
    entry.close();
  }
}