The router began as a port of FreeRouting and has grown its own engine
(negotiated congestion, tree nets, exact checks, axis escapes), and
'freeroute' was one letter from the project it no longer follows. The
package, module and command are now rpmroute; the freeroute command stays
as an alias, and the RPMROUTE / RPMROUTE_ORACLE_JAVA variables fall back
to the old FREEROUTE names. Version 2026.10.07. Routing is unchanged: a
PCBench board routes to a byte-identical session either way.
On the TerraHawk rc4 power stage every engine misread the board's rule areas:
- A no-track ring along the board edge arrives as one keyhole polygon, and
keepout polygons were wrapped in a single convex tile, so the ring became
the whole board. Split keepout polygons into convex pieces instead.
- The grid engine rasterized an area by its overall bounding box, which for
that ring is again the whole board; it routed nothing. Rasterize per tile.
- "Keep router off" rule areas arrive as wire_keepout, which the reader did
not know, so tracks ran through them (172 DRC items_not_allowed). Read it
at board and image level. For now it blocks vias too, which is stricter
than KiCad and cannot create a violation.
- place_keepout only restricts part placement; stop treating it as copper.
The oracle now runs the JAR headless; it was opening FreeRouting's GUI on
the desktop for every oracle test.
FreeRouting ships no unit tests for its geometry/router, so there is no
value-level oracle to port against. This adds a dev/test-only harness that runs
the reference JAR to route a DSN, letting freeroute's output be diffed against
the reference implementation — the router phase will assert connectivity parity
(same nets routed) via routed_net_set().
- tests/oracle.py: locate Java 21+ and a freerouting JAR (env overrides:
FREEROUTE_ORACLE_JAVA, FREEROUTING_JAR), route a DSN, and extract routed
connectivity from the SES. requires_oracle skips when no JVM/JAR is present,
so the suite stays Java-free.
- tests/test_oracle.py: routes a routable board end-to-end and checks the
connectivity extraction.
- tests/dsn/fixtures/kicad_routable.dsn: a real KiCad pcbnew-exported DSN
(Arduino_Mega template, path sanitized) that actually routes — the smd_demo
fixture leaves its nets unrouted.
- pyproject: pythonpath=["tests"] so the harness imports as `oracle`.
rsp2k