Merge pull request #60 from regicidalplutophage/patch-1

digital_inout.py: add exceptions when ipol register is absent

Author: tannewt

adafruit_mcp230xx/digital_inout.py

@@ -148,13 +148,19 @@ def invert_polarity(self) -> bool:
         """The polarity of the pin, either True for an Inverted or
         False for an normal.
         """
-        if _get_bit(self._mcp.ipol, self._pin):
+        if hasattr(self._mcp, "ipol") and _get_bit(self._mcp.ipol, self._pin):
             return True
         return False
 
     @invert_polarity.setter
     def invert_polarity(self, val: bool) -> None:
         if val:
-            self._mcp.ipol = _enable_bit(self._mcp.ipol, self._pin)
+            if hasattr(self._mcp, "ipol"):
+                self._mcp.ipol = _enable_bit(self._mcp.ipol, self._pin)
+            else:
+                raise ValueError("Inverted polarity is not supported.")
         else:
-            self._mcp.ipol = _clear_bit(self._mcp.ipol, self._pin)
+            if hasattr(self._mcp, "ipol"):
+                self._mcp.ipol = _clear_bit(self._mcp.ipol, self._pin)
+            else:
+                return