ESP32 Forum

hi
im new in esp32
can anyone help me how can connect esp32-s3-wroom to the sd card in 4-bit sdio protocol?

There's an example for this under esp-idf/examples/storage/sdmmc.
From a hardware perspective, using sdio with the s3 is easy because the s3 allows you to use just about any GPIO for any of the sdio signals.

thanks gtjoseph

isnt any default IO for SDIO?
how can i setup pin number for use sdio ?

The example at https://github.com/espressif/esp-idf/tr ... card/sdmmc
shows you exactly how to set the pins.

Hello,

Related to this question, we are looking to use the ESP32-S3-WROOM-2-N32R8V in a project.

We want to attach an SD card in 4 bit mode.

Per the datasheet, it appears the -S3 supports two separate SD card "slots".

* Would we be able to connect the SD card in 4 bit mode independent of the internal PSRAM and flash?
* Would we be able to map all of the signal lines to arbitrary GPIO pins on the module we're working with?

Looking at https://github.com/espressif/esp-idf/tr ... card/sdmmc

It suggests attaching GPIO33 and 34 to my SD card, but 33/34 is not connected to the pads on the module we are using - they're internally connected to the flash.
For our SD card, could we map GPIO33/34 to a different pin on our module?

TIA

Hi nullbert,

On ESP32-S3 you can use any available I/Os (not used for other purposes) for SDMMC peripheral. The driver will use the GPIO matrix to route the I/Os to the peripheral signals.

Please see the first paragraph in the S3 related part of the example README file: https://github.com/espressif/esp-idf/tr ... r-esp32-s3

Or the API reference: https://docs.espressif.com/projects/esp ... ring-gpios

So yes, you can use different IOs than 33 and 34 in your project.