How to Interface SD card to Arduino (without SD card shield)?

  1/*
  2  SD card test
  3
  4  This example shows how use the utility libraries on which the'
  5  SD library is based in order to get info about your SD card.
  6  Very useful for testing a card when you're not sure whether its working or not.
  7
  8  The circuit:
  9    SD card attached to SPI bus as follows:
 10 ** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
 11 ** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
 12 ** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
 13 ** CS - depends on your SD card shield or module.
 14   Pin 4 used here for consistency with other Arduino examples
 15
 16
 17  created  28 Mar 2011
 18  by Limor Fried
 19  modified 9 Apr 2012
 20  by Tom Igoe
 21*/
 22// include the SD library:
 23#include <spi .h="">
 24#include <sd .h="">
 25
 26// set up variables using the SD utility library functions:
 27Sd2Card card;
 28SdVolume volume;
 29SdFile root;
 30
 31// change this to match your SD shield or module;
 32// Arduino Ethernet shield: pin 4
 33// Adafruit SD shields and modules: pin 10
 34// Sparkfun SD shield: pin 8
 35// MKRZero SD: SDCARD_SS_PIN
 36const int chipSelect = 10;
 37
 38void setup() {
 39  // Open serial communications and wait for port to open:
 40  Serial.begin(9600);
 41  while (!Serial) {
 42    ; // wait for serial port to connect. Needed for native USB port only
 43  }
 44
 45
 46  Serial.print("nInitializing SD card...");
 47
 48  // we'll use the initialization code from the utility libraries
 49  // since we're just testing if the card is working!
 50  if (!card.init(SPI_HALF_SPEED, chipSelect)) {
 51    Serial.println("initialization failed. Things to check:");
 52    Serial.println("* is a card inserted?");
 53    Serial.println("* is your wiring correct?");
 54    Serial.println("* did you change the chipSelect pin to match your shield or module?");
 55    while (1);
 56  } else {
 57    Serial.println("Wiring is correct and a card is present.");
 58  }
 59
 60  // print the type of card
 61  Serial.println();
 62  Serial.print("Card type:         ");
 63  switch (card.type()) {
 64    case SD_CARD_TYPE_SD1:
 65      Serial.println("SD1");
 66      break;
 67    case SD_CARD_TYPE_SD2:
 68      Serial.println("SD2");
 69      break;
 70    case SD_CARD_TYPE_SDHC:
 71      Serial.println("SDHC");
 72      break;
 73    default:
 74      Serial.println("Unknown");
 75  }
 76
 77  // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
 78  if (!volume.init(card)) {
 79    Serial.println("Could not find FAT16/FAT32 partition.nMake sure you've formatted the card");
 80    while (1);
 81  }
 82
 83  Serial.print("Clusters:          ");
 84  Serial.println(volume.clusterCount());
 85  Serial.print("Blocks x Cluster:  ");
 86  Serial.println(volume.blocksPerCluster());
 87
 88  Serial.print("Total Blocks:      ");
 89  Serial.println(volume.blocksPerCluster() * volume.clusterCount());
 90  Serial.println();
 91
 92  // print the type and size of the first FAT-type volume
 93  uint32_t volumesize;
 94  Serial.print("Volume type is:    FAT");
 95  Serial.println(volume.fatType(), DEC);
 96
 97  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks
 98  volumesize *= volume.clusterCount();       // we'll have a lot of clusters
 99  volumesize /= 2;                           // SD card blocks are always 512 bytes (2 blocks are 1KB)
100  Serial.print("Volume size (Kb):  ");
101  Serial.println(volumesize);
102  Serial.print("Volume size (Mb):  ");
103  volumesize /= 1024;
104  Serial.println(volumesize);
105  Serial.print("Volume size (Gb):  ");
106  Serial.println((float)volumesize / 1024.0);
107
108  Serial.println("nFiles found on the card (name, date and size in bytes): ");
109  root.openRoot(volume);
110
111  // list all files in the card with date and size
112  root.ls(LS_R | LS_DATE | LS_SIZE);
113}
114
115void loop(void) {
116}