Fix issue adafruit#6 and add tca8418_simpletest.py

Author: prcutler

examples/tca8418_simpletest.py

@@ -0,0 +1,22 @@
+# SPDX-FileCopyrightText: Copyright (c) 2022 ladyada for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+import time
+import board
+from adafruit_tca8418 import TCA8418
+
+i2c = board.I2C()  # uses board.SCL and board.SDA
+tca = TCA8418(i2c)
+
+# setup R0 as an output GPIO
+OUTPIN = TCA8418.R0
+tca.gpio_mode[OUTPIN] = True
+tca.gpio_direction[OUTPIN] = True
+
+# blink it!
+while True:
+    tca.output_value[OUTPIN] = True
+    time.sleep(0.1)
+    tca.output_value[OUTPIN] = False
+    time.sleep(0.1)