Using SD Fat on Teensy 4.1

[tedm]

I'm starting a project that uses the SD card slot on the Teensy 4.1. Can anyone please provide:

1. An example of code that's written to use the SD Fat code on a Teensy 4.1 and using the SD slot on the Teensy 4.1 running QSPI?
2. Where are the recommended SD Fat drivers for use with a Teensy 4.1 located?
3. Where can I find the documentation that describes the functions available in that library?

Thanks in advance,

Ted

 

[KurtE]

Simplest answer: Install the latest version of Teensyduino. Either 56 or 57 beta 3...

The install will install both the SD library as well as SDFat. Note: with the more recent versions of Teensyduino, SD is a thin wrapper on SDFat.
Note: you should verify that it builds with these versions and not with other versions of these libraries that might be contained in (sketches folder)/libraries

Maybe easiest to start of the examples. For example SD->listfiles

Which has stuff like:

#include <SD.h>

// change this to match your SD shield or module;
// Teensy 2.0: pin 0
// Teensy++ 2.0: pin 20
// Wiz820+SD board: pin 4
// Teensy audio board: pin 10
// Teensy 3.5 & 3.6 & 4.1 on-board: BUILTIN_SDCARD
const int chipSelect = 10;

void setup()
{
  //Uncomment these lines for Teensy 3.x Audio Shield (Rev C)
  //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:
  Serial.begin(9600);
   while (!Serial) {
    ; // wait for serial port to connect.
  }

  Serial.print("Initializing SD card...");

  if (!SD.begin(chipSelect)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");
...

So for 4.1 you would want to use BUILTIN_SDCARD
Which will build using the qspi support.

As for reference. Not sure... There is some documention for SDFat up on github

 

[tedm]

Thanks Kurt, I'll dig into that.

Ted

 

[tedm]

Just to help anyone following in my footsteps...

To get documentation on SDFAT, go to this github page, download the zip file and expand it to a location of your choice, then look for the file index.html and open it in your browser (just double click in file explorer).