# TCP → I2C bridge

## Authorship

This document was generated using ChatGPT (OpenAI), version 5.2.
It has not been independently reviewed or validated yet.

# Translation units

## `i2c_controller.c`

* `i2c_handle_frame(cmd, payload, len, reply_buf, *reply_len)`
* No transport knowledge.
* Pure logic + hardware calls.


## `usb_transport.c`

* Parses frames from CDC.
* Calls `i2c_handle_frame()`.
* Writes reply back over USB.

## `tcp_transport.c`

* Same framing.
* Calls same `i2c_handle_frame()`.
* Writes reply over TCP.


# Notes

* The framing + transport layer is swappable.
* The I²C logic is isolated.

# Result

* USB for development/debug.
* TCP for deployment.
* Zero duplication of protocol logic.