This component implements a driver for the I2C interface of the CH32V203 coprocessor on Tanmatsu.
You can find the firmware running on the CH32V203 coprocessor in the Tanmatsu coprocessor firmware repository.
Packages from this repository are uploaded to Espressif's component service.
You can add them to your project via idf.py add-dependancy, e.g.
idf.py add-dependency "nicolaielectronics/tanmatsu_coprocessor"
Alternatively, you can manually create an idf_component.yml file for your project (more information in Espressif's documentation) or clone this repository into your projects components folder (be sure to name the folder tanmatsu_coprocessor).