add a specific test/reproducer

examples/dual_test.py

@@ -0,0 +1,36 @@
+# Test for https://github.com/adafruit/Adafruit_Blinka_Raspberry_Pi5_Neopixel/issues/3
+# With the bug NOT fixed, some of the pixels would be corrupted.
+#
+# This corruption wasn't seen (or wasn't seen as much) if the Python program
+# had any sleeps between updates, such as the dual_animation example. Thus,
+# a dedicated reproducer for the bug is desired.
+
+import time
+
+import adafruit_pixelbuf
+import board
+from adafruit_raspberry_pi5_neopixel_write import neopixel_write
+
+NEOPIXEL1 = board.D13
+NEOPIXEL2 = board.D12
+num_pixels = 96
+
+class Pi5Pixelbuf(adafruit_pixelbuf.PixelBuf):
+    def __init__(self, pin, size, **kwargs):
+        self._pin = pin
+        super().__init__(size=size, **kwargs)
+
+    def _transmit(self, buf):
+        neopixel_write(self._pin, buf)
+
+pixels1 = Pi5Pixelbuf(NEOPIXEL1, num_pixels, auto_write=True, byteorder="BGR")
+pixels2 = Pi5Pixelbuf(NEOPIXEL2, num_pixels, auto_write=True, byteorder="BGR")
+
+while True:
+    pixels1.fill(0x1)
+    pixels2.fill(0x100)
+    time.sleep(.1)
+
+    pixels1.fill(0x100)
+    pixels2.fill(0x10000)
+    time.sleep(.1)