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Thread: Adafruit SPI Flash SD Card - XTSD 512 MB - Issues with Teensy 4.1

  1. #1
    Junior Member
    Join Date
    May 2021

    Adafruit SPI Flash SD Card - XTSD 512 MB - Issues with Teensy 4.1

    Having an issue with the Adafruit SPI Flash SD Card, there seem to be issues communicating via SPI.

    I'm running everything via Platform.IO on a Teensy 4.1.

    #include <Arduino.h>
    #include <SPI.h>
    #include <SD.h>
    // set up variables using the SD utility library functions:
    // 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 & 4.1 on-board: BUILTIN_SDCARD
    // Wiz820+SD board: pin 4
    // Teensy 2.0: pin 0
    // Teensy++ 2.0: pin 20
    const int chipSelect = 10;
    // const int SDchipSelect = BUILTIN_SDCARD;
    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.
      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) {
    The serial monitor shows:

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

    Card type: SD2
    Could not find FAT16/FAT32 partition.
    Make sure you've formatted the card

    I've successfully connected this chip to an Arduino Mega already. Any guidance would be appreciated!

  2. #2
    Senior Member+ KurtE's Avatar
    Join Date
    Jan 2014
    If it were me, I would try it running on Arduino, like 15... Along with the latest Teensyduino beta, which can be downloaded from the thread:

    The older SD library is limited on formats of cards it supports. The new version in the beta, is updated to the later version of SDFat which suppports Fat16, Fast32 and ExFat

    As for Platform IO. For the most part I don't use it, so not sure how to properly update the installed libraries.

  3. #3
    Junior Member
    Join Date
    May 2021
    Thank you! I will definitely be trying that, I appreciate it!

  4. #4
    Junior Member
    Join Date
    May 2021
    So running through the Arduino IDE did work, so I guess I can either just use that or figure out why it isn't working with Platform IO. Thanks!

  5. #5
    Junior Member
    Join Date
    May 2021
    So I completely replaced Platform IOs version of teensyduino with the latest release, and it worked! I completely replaced the teensy>avr>cores and the teensy>avr>libraries contents and got everything working. Thank you so much!

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