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EtherShield SD Card Access

Since I was playing with my EtherShield SD, I figured I’d load up the example sketch “CardInfo” in the SD folder. I popped in the microSD card from my digital camera, and it started listing the files on my card (but did not recognize the full 16GB partition).

Initializing SD card…Wiring is correct and a card is present.

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Card type: SDHC

Volume type is FAT32

Volume size (bytes): 3038248960
Volume size (Kbytes): 2967040
Volume size (Mbytes): 2897

Files found on the card (name, date and size in bytes):
DCIM/         2011-06-20 14:58:52
100_PANA/     2011-06-20 19:07:48
P1000812.JPG  2011-09-08 09:19:54 4158647
P1000781.JPG  2011-08-20 21:02:02 4309863
P1000813.JPG  2011-09-08 09:20:00 4258311
P1000814.JPG  2011-09-08 09:20:06 4145655
P1000954.JPG  2011-10-05 19:11:52 3605223

SD card test

This example shows how use the utility libraries on which the’
SD library is based in order to get info about your SD card.
Very useful for testing a card when you’re not sure whether its working or not.

The circuit:
* SD card attached to SPI bus as follows:
** MOSI – pin 11 on Arduino Uno/Duemilanove/Diecimila
** MISO – pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK – pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS – depends on your SD card shield or module.
Pin 4 used here for consistency with other Arduino examples

created  28 Mar 2011
by Limor Fried
modified 9 Apr 2012
by Tom Igoe
// include the SD library:
#include <SD.h>

// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;

// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = 4;

void setup()
// Open serial communications and wait for port to open:
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only

Serial.print(“nInitializing SD card…”);
// On the Ethernet Shield, CS is pin 4. It’s set as an output by default.
// Note that even if it’s not used as the CS pin, the hardware SS pin
// (10 on most Arduino boards, 53 on the Mega) must be left as an output
// or the SD library functions will not work.
pinMode(10, OUTPUT);     // change this to 53 on a mega

// we’ll use the initialization code from the utility libraries
// since we’re just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println(“initialization failed. Things to check:”);
Serial.println(“* is a card is inserted?”);
Serial.println(“* Is your wiring correct?”);
Serial.println(“* did you change the chipSelect pin to match your shield or module?”);
} else {
Serial.println(“Wiring is correct and a card is present.”);

// print the type of card
Serial.print(“nCard type: “);
switch(card.type()) {

// Now we will try to open the ‘volume’/’partition’ – it should be FAT16 or FAT32
if (!volume.init(card)) {
Serial.println(“Could not find FAT16/FAT32 partition.nMake sure you’ve formatted the card”);

// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print(“nVolume type is FAT”);
Serial.println(volume.fatType(), DEC);

volumesize = volume.blocksPerCluster();    // clusters are collections of blocks
volumesize *= volume.clusterCount();       // we’ll have a lot of clusters
volumesize *= 512;                            // SD card blocks are always 512 bytes
Serial.print(“Volume size (bytes): “);
Serial.print(“Volume size (Kbytes): “);
volumesize /= 1024;
Serial.print(“Volume size (Mbytes): “);
volumesize /= 1024;

Serial.println(“nFiles found on the card (name, date and size in bytes): “);

// list all files in the card with date and size | LS_DATE | LS_SIZE);

void loop(void) {


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