Ryan Malloy
89c0481ccc
Implements a working autorouter and the Java-free replacement for the freerouting.jar step: dsn_text -> parse_dsn -> build_board -> route -> write_ses. GridRouter is a single-layer A* maze search over a uniform occupancy grid: a cell is blocked by another net's pad (inflated by clearance + half trace width) or a keepout; each net's ratsnest is connected pin to pin; a routed trace then blocks other nets. The cell path becomes a trace polyline whose endpoints are the exact pin locations. Board-unit paths are converted back to DSN units for the SES (wire (path ...)) scopes. This is an MVP, not a port of FreeRouting's expansion-room maze: free-space rooms, rip-up-and-retry, multi-layer via search, and shove are deferred (they raise quality/coverage, not the connectivity milestone). It reaches connectivity on boards whose nets route on one layer without crossing. Adds tests/dsn/fixtures/simple_2net.dsn (a guaranteed-routable 2-net board). Invariant tests: both nets route, the emitted SES parses, every trace stays on a valid layer and within the board outline, and every routed net's trace endpoints sit exactly on its two pads. An oracle-gated test asserts connectivity parity with the reference FreeRouting JAR on the simple board.
74 lines
1.3 KiB
Plaintext
74 lines
1.3 KiB
Plaintext
(pcb "simple_2net.dsn"
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(parser
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(string_quote ")
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(space_in_quoted_tokens on)
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(host_cad "freeroute-test")
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(host_version "1.0")
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)
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(resolution um 10)
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(unit um)
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(structure
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(layer Top
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(type signal)
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(property
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(index 0)
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)
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)
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(layer Bottom
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(type signal)
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(property
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(index 1)
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)
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)
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(boundary
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(path pcb 0 0 0 200000 0 200000 -80000 0 -80000 0 0)
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)
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(via "Via[0-1]_600:300_um")
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(rule
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(width 2000)
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(clearance 2000)
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)
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)
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(library
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(padstack Rect_Pad
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(shape (rect Top -1000 -1000 1000 1000))
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(attach off)
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)
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(padstack "Via[0-1]_600:300_um"
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(shape (circle Top 600))
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(shape (circle Bottom 600))
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(attach off)
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)
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(image PAD
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(pin Rect_Pad 1 0 0)
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)
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)
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(placement
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(component PAD
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(place A1 20000 -20000 front 0)
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(place A2 180000 -20000 front 0)
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(place B1 20000 -60000 front 0)
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(place B2 180000 -60000 front 0)
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)
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)
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(network
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(net NET_A
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(pins A1-1 A2-1)
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)
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(net NET_B
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(pins B1-1 B2-1)
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)
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(class default
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(circuit
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(use_via "Via[0-1]_600:300_um")
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)
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(rule
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(width 2000)
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(clearance 2000)
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)
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)
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)
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(wiring
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)
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)
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