Ryan Malloy
49c258e81d
Adds crossing_2net.dsn: NET_A is a full-width horizontal wall and NET_B's pins sit above and below it, so single-layer routing cannot connect NET_B but two-layer routing succeeds by dipping to the other layer through vias. Tests assert the multi-layer invariants: single-layer routing leaves a net unrouted with no vias; multi-layer connects both nets with >= 1 via; the SES contains a via scope; every via sits at a real layer transition of its net's path; trace/via endpoints still land on the pads; traces stay on valid layers and within the outline; and no two different nets cross on the same layer. Oracle-gated parity tests cover the simple and crossing boards.
freeroute
A native Python PCB autorouter — a Java-free port of the FreeRouting engine.
Why
kicad-mcp currently autoroutes by shelling out to freerouting.jar, which
drags in a JVM dependency. freeroute reimplements the routing engine in
pure Python so the toolchain needs no Java at all.
The contract
The entire integration surface is two Specctra files:
board.dsn ──▶ freeroute ──▶ board.ses
(unrouted) (routed session: traces + vias)
kicad-cli already exports .dsn and imports .ses, so freeroute is a
drop-in replacement for the JAR step — nothing else in the pipeline changes.
Status
Pre-alpha. Under active development. See docs/PORTING_PLAN.md
for the architecture and porting roadmap.
Usage (target)
freeroute board.dsn -o board.ses
Development
uv sync
uv run pytest
uv run ruff check src/ tests/
License
GPL-3.0-or-later, matching the FreeRouting source it is ported from.