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Thread: Newbie SD card questions

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  1. #1
    Senior Member
    Join Date
    May 2015

    Newbie SD card questions

    I have an audio adaptor and teensy 3.2 hooked up and get the following output when running the cardinfo example.

    Initializing SD card...initialization failed. Things to check:
    * is a card inserted?
    * is your wiring correct?
    * did you change the chipSelect pin to match your shield or module?
    I have tried both 72 Mhz and 24 Mhz compile options with the same result.

    I THINK I made the proper changes in the code:

      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, pin 7 on Teensy with audio board
     ** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
     ** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila, pin 14 on Teensy with audio board
     ** CS - depends on your SD card shield or module - pin 10 on Teensy with audio board
     		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>
    #include <SPI.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
    // Teensy audio board: pin 10
    // Teensy 3.5 & 3.6 on-board: BUILTIN_SDCARD
    // Wiz820+SD board: pin 4
    // Teensy 2.0: pin 0
    // Teensy++ 2.0: pin 20
    const int chipSelect = 10;    
    void setup()
      SPI.setMOSI(7);  // Audio shield has MOSI on pin 7
      SPI.setSCK(14);  // Audio shield has SCK on pin 14
     // 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...");
      // 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?");
      } else {
       Serial.println("Wiring is correct and a card is present."); 
      // print the type of card
      Serial.print("\nCard type: ");
      switch(card.type()) {
        case SD_CARD_TYPE_SD1:
        case SD_CARD_TYPE_SD2:
        case SD_CARD_TYPE_SDHC:
      // 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
      if (volumesize < 8388608ul) {
        Serial.print("Volume size (bytes): ");
        Serial.println(volumesize * 512);        // SD card blocks are always 512 bytes
      Serial.print("Volume size (Kbytes): ");
      volumesize /= 2;
      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) {

    Should the card at least report the card type even if its unformatted or formatted incorrectly? Unrelated but it shows the Teensy(R) is inserted correctly I can access the serial flash (erase and hardware tests) and play the tonesweep example.

    Latest released Teensyduino and Arduino packages both clean installs two days ago (I had to reformat my Macbook Pro hard drive).
    Last edited by DaQue; 11-17-2017 at 03:23 PM. Reason: compile fclock info added

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