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Overview

Not a j1939 specific thing!

USB-CAN bridge

Document v0.1 See LAWICEL / SLCAN linux support

1. Design Goals

This firmware is a USB-CAN bridge by way of SLCAN protocol. Technically supported by Linux, macOS and Windows (See Section 2)

1.1. SLCAN protocol implementation

Also known as LAWICEL, this protocol is a USB implementation of the older UART-CAN protocol. Supported:

  • RTR requests
  • Auto-polling on or off (default on)
  • Error/Alert interrogation

2. Infrastructure

3. Observations & Opinions

3.1. Unexpected host->USB traffic

Seeing a ^G appear during slcan_attach, so far don't have a clue what that is.

3.2. Linux can utilities

Linux SLCAN and friends are really quite extensive, including a bunch of J1939 test tools [2]

3.3. Dev on ESP32S3

So far I can't quite get USJ + console to place nice together. I feel there is a way to do it, however

Results

  • 20JUN24 - ESP32C6 DevKit - PASS
  • 21JUN24 - ESP32S3 LilyGo QT - PASS

References

  1. https://accesio.com/MANUALS/CAN232FD_Reference.html
  2. https://github.com/linux-can/can-utils/tree/master