Imported from GitHub: rmingon/lin-to-can-gateway · commit 2df7b24 · license CERN-OHL-S-2.0
Description
A secure LIN-to-CAN gateway PCB based on STM32F107 with AES encryption, featuring MCP2551 CAN and TJA1020 LIN transceivers. Designed for automotive, industrial, and IoT applications.
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
- Assemble the PCB with the provided KiCad files and BOM.
- Flash the firmware via the SWD interface.
- Connect LIN and CAN networks to the respective terminals.
- 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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