digitalio: Enable Pull.DOWN mode

Author: jepler

adafruit_seesaw/digitalio.py

@@ -62,8 +62,8 @@ def switch_to_output(self, value=False, drive_mode=digitalio.DriveMode.PUSH_PULL
     def switch_to_input(self, pull=None):
         """Switch the pin to input mode"""
         if pull == digitalio.Pull.DOWN:
-            raise ValueError("Pull Down currently not supported")
-        if pull == digitalio.Pull.UP:
+            self._seesaw.pin_mode(self._pin, self._seesaw.INPUT_PULLDOWN)
+        elif pull == digitalio.Pull.UP:
             self._seesaw.pin_mode(self._pin, self._seesaw.INPUT_PULLUP)
         else:
             self._seesaw.pin_mode(self._pin, self._seesaw.INPUT)
@@ -117,8 +117,8 @@ def pull(self, mode):
         if self._direction == digitalio.Direction.OUTPUT:
             raise AttributeError("cannot set pull on an output pin")
         if mode == digitalio.Pull.DOWN:
-            raise ValueError("Pull Down currently not supported")
-        if mode == digitalio.Pull.UP:
+            self._seesaw.pin_mode(self._pin, self._seesaw.INPUT_PULLDOWN)
+        elif mode == digitalio.Pull.UP:
             self._seesaw.pin_mode(self._pin, self._seesaw.INPUT_PULLUP)
         elif mode is None:
             self._seesaw.pin_mode(self._pin, self._seesaw.INPUT)