Crosstalk-test: Identify strips with a binary code

tools/crosstalk-test.py

@@ -3,16 +3,29 @@
 # Open Pixel Control client: Test crosstalk between LED strips;
 # send each strip a different pattern, use a lot of low-brightness
 # pixels so that glitches show up clearly.
+#
+# This also helps identify strips. The first three LEDs are colored
+# according to the strip number, in binary: MSB first, bright green
+# for 1 and dim red for 0.
 
 import opc, time
 
 client = opc.Client('localhost:7890')
 
+bits = ( (40,0,0), (0,255,0) )
+
 while True:
+	# Flash each strip in turn
 	for strip in range(8):
 		pixels = [ (40,40,40) ] * 512
 		for i in range(32):
 			pixels[strip * 64 + i * 2] = (100,100,100)
 
+		# Label all strips always
+		for s in range(8):
+			pixels[s * 64 + 0] = bits[(s >> 2) & 1]
+			pixels[s * 64 + 1] = bits[(s >> 1) & 1]
+			pixels[s * 64 + 2] = bits[(s >> 0) & 1]
+
 		client.put_pixels(pixels)
 		time.sleep(0.5)