95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
#!/usr/bin/env python3
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"""Install deterministic 0.8-mm-pitch dogbone escapes for connected Ti375 balls."""
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from __future__ import annotations
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import argparse
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import shutil
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from pathlib import Path
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import pcbnew
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ROOT = Path(__file__).resolve().parents[1]
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DEFAULT_INPUT = ROOT / "hardware" / "board.kicad_pcb"
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DEFAULT_OUTPUT = ROOT / "hardware" / "board_prerouted.kicad_pcb"
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POWER_NETS = {
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"GND", "VCC0V95", "VCC1V8", "VCC3V3", "VCC3V0_DIG",
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}
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def mm(value: float) -> int:
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return pcbnew.FromMM(value)
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def add_segment(board: pcbnew.BOARD, pad: pcbnew.PAD,
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end: pcbnew.VECTOR2I, width_mm: float) -> None:
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track = pcbnew.PCB_TRACK(board)
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track.SetStart(pad.GetPosition())
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track.SetEnd(end)
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track.SetWidth(mm(width_mm))
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track.SetLayer(pcbnew.F_Cu)
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track.SetNet(pad.GetNet())
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track.SetLocked(True)
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board.Add(track)
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def add_via(board: pcbnew.BOARD, pad: pcbnew.PAD,
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position: pcbnew.VECTOR2I) -> None:
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via = pcbnew.PCB_VIA(board)
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via.SetPosition(position)
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via.SetWidth(mm(0.45))
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via.SetDrill(mm(0.225))
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via.SetLayerPair(pcbnew.F_Cu, pcbnew.B_Cu)
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via.SetNet(pad.GetNet())
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via.SetLocked(True)
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board.Add(via)
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def main() -> None:
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parser = argparse.ArgumentParser()
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parser.add_argument("input", nargs="?", type=Path, default=DEFAULT_INPUT)
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parser.add_argument("output", nargs="?", type=Path, default=DEFAULT_OUTPUT)
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args = parser.parse_args()
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board = pcbnew.LoadBoard(str(args.input))
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fpga = board.FindFootprintByReference("U1")
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if fpga is None:
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raise RuntimeError("U1 Ti375 footprint is missing")
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centre = fpga.GetPosition()
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occupied: set[tuple[int, int]] = set()
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counts = {"power": 0, "signal": 0}
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for pad in fpga.Pads():
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if not pad.GetNetname():
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continue
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position = pad.GetPosition()
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# Move each ball toward its package quadrant. Centre-row/column balls
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# use the positive direction, leaving a full 0.8-mm via grid without
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# duplicated interstitial locations.
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dx = 0.4 if position.x >= centre.x else -0.4
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dy = 0.4 if position.y >= centre.y else -0.4
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via_position = pcbnew.VECTOR2I(position.x + mm(dx), position.y + mm(dy))
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key = (via_position.x, via_position.y)
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if key in occupied:
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raise RuntimeError(f"Duplicate dogbone via at {key} for U1.{pad.GetNumber()}")
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occupied.add(key)
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is_power = pad.GetNetname() in POWER_NETS
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add_segment(board, pad, via_position, 0.15 if is_power else 0.10)
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add_via(board, pad, via_position)
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counts["power" if is_power else "signal"] += 1
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if not pcbnew.ZONE_FILLER(board).Fill(board.Zones()):
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raise RuntimeError("Zone fill failed after BGA fanout")
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pcbnew.SaveBoard(str(args.output), board)
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for suffix in (".kicad_pro", ".kicad_dru"):
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source = args.input.with_suffix(suffix)
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if source.exists():
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shutil.copyfile(source, args.output.with_suffix(suffix))
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print(f"Installed {counts['power']} power/GND and {counts['signal']} signal dogbones")
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print(f"Saved {args.output}")
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if __name__ == "__main__":
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main()
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