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lin-to-can-gateway

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@rmingon

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KiCad projectAll 6 files, ready to open in KiCad143 KBSchematic PDFEvery sheet, to read or print110 KB3D modelThe board with its parts, for an enclosure (GLB)3.3 MB
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README

Secure LIN-to-CAN Gateway with AES Encryption

This project implements a custom PCB gateway that bridges Local Interconnect Network (LIN) and Controller Area Network (CAN) communication buses. It integrates AES-based cryptographic software to ensure secure message transfer across networks, making it suitable for both embedded research and industrial-grade applications.

Features

  • MCU Core: STM32F107 microcontroller
  • CAN Transceiver: MCP2551 for reliable CAN bus communication
  • LIN Transceiver: TJA1020 for LIN bus interface
  • Crypto Layer: AES software encryption for secure message payloads
  • Voltage Regulation: On-board LM317 regulator provides stable 3.3V supply
  • Programming & Debugging: SWD interface for firmware upload and debugging
  • User Interface: Reset button, status LEDs, and configuration jumper
  • Compact PCB Design: 2-layer PCB optimized for automotive and embedded systems

Hardware Overview

Major Components

  • U3 – STM32F107: 32-bit ARM Cortex-M3 MCU
  • U1 – MCP2551: High-speed CAN transceiver
  • U4 – TJA1020: LIN transceiver for automotive communication
  • U2 – LM317: Adjustable linear regulator, set to 3.3V output
  • Y2: External crystal oscillator for precise MCU timing

Connectors

  • J1 / J2: LIN and CAN bus connections
  • J3: SWD programming/debugging interface
  • JP1: Boot configuration jumper

Firmware

The firmware implements:

  • LIN message reception, decryption, and forwarding to CAN
  • CAN message reception, encryption, and forwarding to LIN
  • AES-based payload encryption for secure communication
  • Error handling and bus monitoring

Applications

  • Automotive Systems: Securely bridging LIN and CAN buses in vehicles
  • Industrial Automation: Protecting data integrity across mixed communication buses
  • IoT Gateways: Encrypted transport between legacy fieldbuses and modern networks
  • Research & Development: Testing secure communication protocols in embedded systems

Getting Started

  1. Assemble the PCB with the provided KiCad files and BOM.
  2. Flash the firmware via the SWD interface.
  3. Connect LIN and CAN networks to the respective terminals.
  4. Test secure message transfer with your chosen CAN/LIN monitoring tools.

License

This project is licensed under the CERN Open Hardware Licence Version 2 - Strongly Reciprocal (CERN-OHL-S v2).

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