ESP32 Forum

Hi,

We are referring to the ESP32-S3 TRM, and based on the SPI architecture, it looks like SPI1 and GP-SPI2 share the APB, and while the TRM says its safe to use GP-SPI2 and GP-SPI3 for our peripherals, I am not sure if the ESP32-S3-MINI-1U-N4R2 module that has 4MB Flash and 2MB PSRAM is connected or uses GP-SPI2 in any way. The ESP32-S3-MINI-1U-N4R2 datasheet has a footnote that says "The modules use flash and PSRAM integrated in the chip’s package." I am not sure how to interpret it.

We wish to have more storage on the IoT device we are prototyping (adding a 512 MB NOR flash for sensor logs to have an offline store and forward design for data), just wanted to confirm if it is safe to use GP-SPI2 to connect this module for extra storage.

Any help/guidance would be truly appreciated.

Thanks,

GP-SPI2 and GP-SPI3 are general-purpose SPI peripherals that are not used for internal ESP32-S3 functionality; as such you're free to hook them up to whatever you desire.

Thank you, appreciate the response.

@ESP_Sprite, does this apply to the specific module too (specifically, ESP32-S3-MINI-1U-N4R2), since the module has embedded PSRAM and Flash, is it possible that any of these use GP-SPI2 or GP-SPI3? I am looking for any documentation that would confirm but not able to find anything concrete.

It would help if you can point me the right way. Thanks.

On the S3, both flash as well as PSRAM use SPI0 and SPI1. SPI2 and 3 are available to use.