ESP32 Forum

Hello.
In the ESP32-DevKitM-1 Development Board documentation (https://docs.espressif.com/projects/esp ... itm-1.html) we can read:

! Attention
ESP32-DevKitM-1 is a board with a single core module, please enable single core mode (CONFIG_FREERTOS_UNICORE) in menuconfig before flashing your applications.

On the other hand, this board incorporates an ESP32-MINI-1 module which, according to the documentation (https://www.espressif.com/sites/default ... eet_en.pdf), is a dual-core microprocessor:

1.1 Features
CPU and On­Chip Memory
• ESP32-U4WDH embedded, Xtensa dual-core
32-bit LX6 microprocessor, up to 240 MHz

Could you please explain this apparent contradiction?

Thank you and have a nice day!

I think it used to use a Solo chip, but we changed things later on. It may depends on the specific devkit.

Thank you ESP_Sprite for your answer.
In my question I have made reference to a specific development board and a specific microprocessor.
Could I have a more specific answer, please?

I mean, it may depend on the specific devkit as in the actual piece of hardware in your hands, not the model. If the ESP32-DevKitM-1 you get is older, it may have only one usable core as it says in the specs; if you get one that is newer you may have an usable extra core for free.

Now I understand. Thank you very much!

BTW, there is conflicting information in the ESP Product Selector https://products.espressif.com/#/product-comparison and the ESP32-MINI-1 Datasheet https://espressif.com/sites/default/fil ... eet_en.pdf:

In all versions of the ESP32-MINI-1 Module it says

CPU Xtensa® single-core 32-bit LX6
Core 2

and in the Datasheet it says

Built around ESP32 series of SoC, Xtensa® dual­-core 32­bit LX6 microprocessor

So, is the ESP32-MINI-1 Module single-core or dual-core?

Hi ALGONSI,

ESP32-U4WDH chip variant installed inside ESP32-MINI-1 module has been upgraded from single to dual-core in December 2021. This information is covered in ESP32 Datasheet on page 52 in the footnote. After that date, newly manufactured ESP32-MINI-1 modules and then ESP32-DevKitM-1 boards should contain the new dual-core chip.
Further details on this change are in PCN-2021-021.

I am sorry for the confusion. The note in the ESP32-DevKitM-1 user guide and the information about ESP32-MINI-1 in the ESP Product Selector will be updated soon.

Thank you very much ESP_krzychb !