Migrate MCP and utilities to CircuitPython, including color GIF and volume fixes

circuitpython/lib/rgb_led_cp.py

@@ -0,0 +1,43 @@
+"""CircuitPython NeoPixel LED utility.
+
+Uses the neopixel library and time.monotonic() to run breathing and rainbow animations.
+"""
+
+import math
+import time
+import neopixel
+
+class BoardLED:
+    def __init__(self, pin):
+        # Initialize 1 NeoPixel on the specified pin
+        self.np = neopixel.NeoPixel(pin, 1, brightness=1.0, auto_write=False)
+        self.base_color = (0, 0, 0)
+        self.off()
+
+    def set_color(self, r, g, b):
+        self.base_color = (r, g, b)
+        self.np[0] = (r, g, b)
+        self.np.show()
+
+    def off(self):
+        self.set_color(0, 0, 0)
+
+    def update_breathing(self, speed_factor=1.0):
+        if self.base_color == (0, 0, 0):
+            return
+        t = time.monotonic() * speed_factor
+        # Sine wave from 0.05 to 1.0
+        factor = 0.525 + 0.475 * math.sin(t * math.pi)
+        br = int(self.base_color[0] * factor)
+        bg = int(self.base_color[1] * factor)
+        bb = int(self.base_color[2] * factor)
+        self.np[0] = (br, bg, bb)
+        self.np.show()
+
+    def update_rainbow(self, speed_factor=0.2):
+        t = time.monotonic() * speed_factor
+        r = int(127.5 * (1.0 + math.sin(t * 2.0 * math.pi)))
+        g = int(127.5 * (1.0 + math.sin(t * 2.0 * math.pi + 2.0 * math.pi / 3.0)))
+        b = int(127.5 * (1.0 + math.sin(t * 2.0 * math.pi + 4.0 * math.pi / 3.0)))
+        self.np[0] = (r, g, b)
+        self.np.show()