Add multi-panel Pico UDP firmware and Python LED control.

Pico panels get static IPs on 10.1.1.10–14 with per-panel LED counts, Makefile deploy targets, and Python examples for animations, sync tests, and direct Pi SPI control.

Co-authored-by: Cursor <cursoragent@cursor.com>

examples/fix_spi1_config.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+"""Ensure dtoverlay=spi1-3cs is under [all] for Pi 5 Model B."""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+CONFIG = Path("/boot/firmware/config.txt")
+OVERLAY = "dtoverlay=spi1-3cs"
+
+
+def main() -> int:
+    if not CONFIG.exists():
+        print(f"Error: {CONFIG} not found", file=sys.stderr)
+        return 1
+
+    lines = CONFIG.read_text().splitlines()
+    out: list[str] = []
+    in_cm5 = False
+    has_overlay = False
+    inserted = False
+
+    for line in lines:
+        stripped = line.strip()
+        if stripped == "[cm5]":
+            in_cm5 = True
+        elif stripped.startswith("[") and stripped.endswith("]"):
+            if in_cm5 and not inserted and not has_overlay:
+                out.append(OVERLAY)
+                inserted = True
+            in_cm5 = False
+
+        if stripped == "dtparam=spi1=on":
+            continue
+        if stripped == OVERLAY:
+            has_overlay = True
+            if in_cm5:
+                continue
+            out.append(line)
+            continue
+        out.append(line)
+
+    if not has_overlay and not inserted:
+        if out and out[-1].strip():
+            out.append("")
+        out.append(OVERLAY)
+
+    new_text = "\n".join(out) + "\n"
+    if new_text == CONFIG.read_text():
+        print("config.txt already correct.")
+    else:
+        CONFIG.write_text(new_text)
+        print("Updated /boot/firmware/config.txt:")
+        print(f"  - removed dtparam=spi1=on (ignored on Pi 5)")
+        print(f"  - moved {OVERLAY} out of [cm5] into [all]")
+        print("Reboot for the change to take effect on boot.")
+
+    print(
+        "\nWiring:\n"
+        "  strip 0 DIN → GPIO 10 (SPI0 MOSI)  /dev/spidev0.0\n"
+        "  strip 1 DIN → GPIO 20 (SPI1 MOSI)  /dev/spidev1.0"
+    )
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())