Support to config ESP32-S3 in I2C Slave Mode in Zephyr

[kavandhamsania]

Hello Zephyr community,

I’m currently working on a project involving the ESP32-S3 and using Zephyr RTOS. I’ve been trying to configure the ESP32-S3 as an I2C slave (target) device, but it seems that Zephyr’s current i2c_esp32.c driver does not support slave mode or the i2c_target_register() API.

I’d like to know if anyone has successfully implemented I2C slave functionality on ESP32-S3 in Zephyr, or if there’s any ongoing discussion around extending the ESP32 I2C driver to support this mode—possibly by utilizing the ESP-IDF’s I2C slave APIs.

I’d appreciate any guidance, references, or collaboration if others are working on a similar goal.

Thanks in advance!

Best regards,
Kavan

[rftafas]

FWIW, the LL functions are present in hal_espressif, but there is no roadmap for this by the Espressif team (as of today).

The required work to do is to glue this LL layer to the Zephyr driver layer.