General issue report Description: I’m trying to use the SPI SD card example from ESP-IDF to mount a micro-SD card via an SPI SD card module. It works fine using Arduino-ESP32, but fails in ESP-IDF.

We will have 4 different layers within this project: SPI layer where we set up and activate the SPI module within the SAMD21 SD card layer where we set up the functions to send commands and data to ...

SD cards can be accessed with two modes. The first is the SDIO mode, which is what cameras, laptops, and other card readers use. The second mode is SPI mode. SPI is slower, but much, much simpler.

A maker developer has squeezed an Arduino onto an SD card. He was inspired by Intel’s Edison compute module and he tried to go one better. The result is the SDuino, an ATMega328P processor-based ...