ESP32 or ESP32-2 or ESP8266 supports external MCU

[velmurugan7kmvs]

Hi All,

I want to add Wi-Fi feature to my existing board. My existing board has an MCU and want to interface this new Wi-Fi module to the MCU.
From the ESP32 or ESP32-2 or ESP8266 series product overview, all i see is that Expressif has MCU + WiFi (SoC) solution only.
Do expressif have an wi-fi module with just stack and that connects to an external MCU via SPI/SDIO/UART?

[chegewara]

https://github.com/sipeed/Maixduino_esp32_fimware
https://github.com/arduino/nina-fw

[velmurugan7kmvs]

Hi chegewara,

I don't get the answer from what you shared. Can you brief your answer?

[chegewara]

It was just example, how esp32 is used with other MCU as wifi.
In maixduino the MCU is kendryte k210, esp32 is controlled over SPI and is using NINA modified firmware (in addition 6 ADC is exposed over SPI).

Second link is NINA firmware that is designed for u-blox series but can be installed on any esp32.
https://www.u-blox.com/en/product/nina- ... s-open-cpu