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>

firmware/panel/WS2812.cpp

@@ -0,0 +1,92 @@
+/* WS2812 driver — from https://github.com/ForsakenNGS/Pico_WS2812 (BSD-style) */
+
+#include "WS2812.hpp"
+
+#include "WS2812.pio.h"
+
+#include <cstdlib>
+
+WS2812::WS2812(uint pin, uint length, PIO pio, uint sm) {
+    initialize(pin, length, pio, sm, NONE, GREEN, RED, BLUE);
+}
+
+WS2812::WS2812(uint pin, uint length, PIO pio, uint sm, DataFormat format) {
+    switch (format) {
+    case FORMAT_RGB:
+        initialize(pin, length, pio, sm, NONE, RED, GREEN, BLUE);
+        break;
+    case FORMAT_GRB:
+        initialize(pin, length, pio, sm, NONE, GREEN, RED, BLUE);
+        break;
+    case FORMAT_WRGB:
+        initialize(pin, length, pio, sm, WHITE, RED, GREEN, BLUE);
+        break;
+    }
+}
+
+WS2812::~WS2812() {
+    delete[] data;
+}
+
+void WS2812::initialize(uint pin, uint length, PIO pio, uint sm, DataByte b1, DataByte b2,
+                        DataByte b3, DataByte b4) {
+    this->pin = pin;
+    this->length = length;
+    this->pio = pio;
+    this->sm = sm;
+    this->data = new uint32_t[length];
+    this->bytes[0] = b1;
+    this->bytes[1] = b2;
+    this->bytes[2] = b3;
+    this->bytes[3] = b4;
+    uint offset = pio_add_program(pio, &ws2812_program);
+    uint bits = (b1 == NONE ? 24 : 32);
+    ws2812_program_init(pio, sm, offset, pin, 800000, bits);
+}
+
+uint32_t WS2812::convertData(uint32_t rgbw) {
+    uint32_t result = 0;
+    for (uint b = 0; b < 4; b++) {
+        switch (bytes[b]) {
+        case RED:
+            result |= (rgbw & 0xFF);
+            break;
+        case GREEN:
+            result |= (rgbw & 0xFF00) >> 8;
+            break;
+        case BLUE:
+            result |= (rgbw & 0xFF0000) >> 16;
+            break;
+        case WHITE:
+            result |= (rgbw & 0xFF000000) >> 24;
+            break;
+        default:
+            break;
+        }
+        result <<= 8;
+    }
+    return result;
+}
+
+void WS2812::setPixelColor(uint index, uint32_t color) {
+    if (index < length) {
+        data[index] = convertData(color);
+    }
+}
+
+void WS2812::setPixelColor(uint index, uint8_t red, uint8_t green, uint8_t blue) {
+    setPixelColor(index, RGB(red, green, blue));
+}
+
+void WS2812::fill(uint32_t color) {
+    color = convertData(color);
+    for (uint i = 0; i < length; i++) {
+        data[i] = color;
+    }
+}
+
+void WS2812::show() {
+    for (uint i = 0; i < length; i++) {
+        pio_sm_put_blocking(pio, sm, data[i]);
+    }
+}