Add manual test for rp2_neopixel

Signed-off-by: Matthias Blankertz <matthias@blankertz.org>

software/src/led_test.py

@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2024 Matthias Blankertz <matthias@blankertz.org>
+
+# Run with mpremote.py run src/led_test.py
+
+from machine import Pin
+from math import pi, sin, pow
+from micropython import const
+from rp2_neopixel import NeoPixel
+from time import sleep, ticks_ms
+import asyncio
+
+pin = Pin.board.GP16
+leds = const(10)
+brightness = 0.5
+
+np = NeoPixel(pin, leds)
+
+# test fill and write
+
+print("LEDs should now turn red")
+np.fill((255, 0, 0))
+np.write()
+sleep(1)
+
+print("LEDs should now turn green")
+np.fill((0, 255, 0))
+np.write()
+sleep(1)
+
+print("LEDs should now turn blue")
+np.fill((0, 0, 255))
+np.write()
+sleep(1)
+
+
+# test async
+def gamma(value, X=2.2):
+    return min(max(int(brightness * pow(value / 255.0, X) * 255.0 + 0.5), 0), 255)
+
+
+async def rainbow(np, period=10):
+    count = 0.0
+    while True:
+        for i in range(leds):
+            ofs = (count + i) % leds
+            np[i] = (gamma((sin(ofs / leds * 2 * pi) + 1) * 127),
+                     gamma((sin(ofs / leds * 2 * pi + 2/3*pi) + 1) * 127),
+                     gamma((sin(ofs / leds * 2 * pi + 4/3*pi) + 1) * 127))
+        count += 0.2
+        before = ticks_ms()
+        await np.async_write()
+        now = ticks_ms()
+        if before + 20 > now:
+            await asyncio.sleep_ms(20 - (now - before))
+
+print("LEDs should now start rainbowing")
+asyncio.run(rainbow(np))