Sample program to read and write data using the builtin sd card reader of Teensy 4.1

[teensy_teen]

Hi, is there a sample program on how to do that?

[PaulStoffregen]

Yes, there are 6 example programs for SD card access. In Arduino, click File > Examples > SD.

You will need to edit the chip select pin to BUILTIN_SDCARD, which is a special constant that tells the SD library to access the SD socket using fast SDIO protocol rather than a SD card connected to the SPI pins. Look for the comments in those examples which explain this.

[teensy_teen]

Thank you