digitalio: Enable Pull.DOWN mode

Author: jepler

adafruit_seesaw/digitalio.py

@@ -46,7 +46,7 @@ def switch_to_output(self, value=False, drive_mode=digitalio.DriveMode.PUSH_PULL
 
     def switch_to_input(self, pull=None):
         if pull == digitalio.Pull.DOWN:
-            raise ValueError("Pull Down currently not supported")
+            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:
@@ -97,7 +97,7 @@ def pull(self, mode):
         if self._direction == digitalio.Direction.OUTPUT:
             raise AttributeError("cannot set pull on an output pin")
         elif mode == digitalio.Pull.DOWN:
-            raise ValueError("Pull Down currently not supported")
+            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: