ESP-Hosted SDIO WiFi

The ESP32-p4 does not have a WiFi radio built in. Therefore each ESP32-p4 board is equiped with a separate ESP32-C6 module to add WiFi-support.

Both ESP32-p4 and ESP32-c6 are connected via a fast SDIO bus.

The ESP32-c6 does run a firmware on its own. This is the esp-hosted-mcu firmware. For more information see esp-hosted-mcu GitHub docs

The factory flashed firmware of this ESP32-c6 is quite old and typically is running version 0.0.6

N.B. Whenever the ESP32-C6 module is not yet flashed, or an update failed, the C6 can be flashed again with build 0.0.6 using this site For this, a separate USB to serial adapter must be wired to the RX/TX pins of the C6, which are accessible via some pin header. (at least on all P4 boards currently available)

ESP-IDF 5.5 is compiled to link against firmware 2.0.12

As stated in the esp-hosted-mcu troubleshooting docs, both the 'hosted code' (running on the ESP32-p4) and the 'slave code' (running on the ESP32-c6) should be kept in sync.

OTA update ESP-Hosted-MCU firmware

In this folder, there is a freshly build firmware for the ESP32-C6, based on version 2.0.13

This file must be made available via some HTTP (not HTTPS) web server, which can be accessed by the ESP32-P4 via WiFi.

For example upload the file to another ESPEasy node with at least 1.2 MByte free space on its file system. (e.g. some ESP32-S3 with 16M flash)

Then this command must be given (adapt the URL for your own situation)

wifiotahostedmcu,"http://192.168.11.1/network_adapter.bin"

Make sure the complete URL is given, including http:// and ending with network_adapter.bin

Keep an eye on the logs via the serial port of the P4 to see its progres.

After about 30 - 60 seconds (depending also on the connection speed of the ESP board serving the file) the ESP32-P4 will reboot and start using the newly flashed WiFi firmware.