can

CAN bus decoder in C++20. Give it a DBC file and a candump log, get CSV out.

./tool vehicle.dbc candump.log

1700000000.032871,SteeringAngle,-3.5
1700000000.032871,SteeringSpeed,0
1700000000.033104,BrakePedalPos,0
...

Pass just a DBC to list the messages and signals in it:

./tool vehicle.dbc

What it does

CAN frames are raw bytes. A DBC file is the schema -- which bits mean what, byte order, scale, offset. This reads both and decodes every frame it recognizes.

Handles Intel (LE) and Motorola (BE) byte order, multiplexed signals, extended 29-bit frame IDs, and scale/offset to physical values.

Build

make        # build
make test   # run tests

Requires g++ with C++20 support. No external dependencies.

Options

./tool file.dbc log.log -s SteeringAngle,BrakePedalPos   # filter to specific signals
./tool file.dbc log.log --stats                           # print min/max/mean per signal to stderr

Tests were written with AI assistance.