# Fixed-route data files

`power_routes.json` and `critical_routes.json` hold the **hand-drawn, audited
geometry** that used to live in `scripts/route_power_stage.py` and the RF/USB
block of `scripts/finalize_routing.py`. They are board-specific layout data —
not an algorithm — consumed by the project-independent loader

```
pcbrouter fixed --in <in.kicad_pcb> --out <out.kicad_pcb> --routes <file.json>
```

which resolves the anchors against the board's footprints and splices locked
copper, rule areas and the RF ground zone into the `.kicad_pcb`. Run
`kicad-cli pcb drc --refill-zones` afterwards so the planes re-carve around the
new vias (the Python scripts called `ZONE_FILLER.Fill()` for the same reason).

Regenerate from the (retired) scripts with
`/usr/bin/python3 scripts/_extract_fixed_routes.py`.

## Schema

```jsonc
{
  "tracks": [
    {
      "net":    "CORE_SW",          // net name (must exist on the board)
      "layer":  "F.Cu",             // KiCad canonical or user layer name
      "width":  0.20,               // mm
      "points": [ "U13.9", [99.25, 95.25], [100.0, 95.25] ]
                                    // each point: "REF.PAD" anchor  OR  [x, y] mm
    }
  ],
  "vias": [
    { "net": "VCC0V95", "at": [107.8, 92.6], "diameter": 0.75, "drill": 0.38 }
                                    // "at" may also be a "REF.PAD" anchor
  ],
  "rule_areas": [
    { "name": "RF_NO_DIGITAL",
      "layers": ["B.Cu", "In2.Cu", "In4.Cu", "In5.Cu"],
      "rect":   [152.0, 36.0, 174.5, 49.5] }     // x0 y0 x1 y1 mm
  ],
  "ground_zones": [
    { "net": "GND", "layer": "F.Cu",
      "clearance": 0.20, "min_thickness": 0.10, "priority": 100,
      "outline":   [[152.0,36.0],[174.5,36.0],[174.5,49.5],[152.0,49.5]],
      "via_fence": [[153,38.7],[155,38.7], ...] }  // 0.45/0.225 GND vias
  ]
}
```

All coordinates are millimetres in the board's own frame (KiCad screen-down Y).
Anchors are resolved to the pad centre. Every emitted item is `(locked yes)`.