Commit edb8f3f8 authored by Erik Strand's avatar Erik Strand

Add Arduino SD card info example

I commented out all uses of the Serial library. As expected it still
doesn't compile, since the Serial library assumes SPI hardware of a
different MCU.
parent 114dfd62
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 <SPI.h>
#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 native USB port only
//Serial.print("\nInitializing SD card...");
// 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 inserted?");
//Serial.println("* is your wiring correct?");
//Serial.println("* did you change the chipSelect pin to match your shield or module?");
while (1);
} else {
//Serial.println("Wiring is correct and a card is present.");
// print the type of card
//Serial.print("Card 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");
while (1);
//Serial.print("Clusters: ");
//Serial.print("Blocks x Cluster: ");
//Serial.print("Total Blocks: ");
//Serial.println(volume.blocksPerCluster() * volume.clusterCount());
// print the type and size of the first FAT-type volume
uint32_t volumesize;
//Serial.print("Volume 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 /= 2; // SD card blocks are always 512 bytes (2 blocks are 1KB)
//Serial.print("Volume size (Kb): ");
//Serial.print("Volume size (Mb): ");
volumesize /= 1024;
//Serial.print("Volume size (Gb): ");
//Serial.println((float)volumesize / 1024.0);
//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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