Mask in getValues()

diff --git a/graphit/pin/pcf8574.py b/graphit/pin/pcf8574.py
index 6d54e749de5d3c192f322761730ecb4b0266fc86..8c98360ba1367fd92b1f48e6a46b3f26dd5f0caa 100644 (file)
--- a/graphit/pin/pcf8574.py
+++ b/graphit/pin/pcf8574.py
@@ -71,7 +71,7 @@ class PCF8574Input(graphit.event.EventEmitterMixin):
         return not bool(self.__values & (1 << pin))
 
     def getValues(self) -> int:
-        return ~self.__values
+        return (~self.__values & 0xFF)
 
 
 class PCF8574Output(graphit.event.EventEmitterMixin):
@@ -106,7 +106,7 @@ class PCF8574Output(graphit.event.EventEmitterMixin):
         return not bool(self.__values & (1 << pin))
 
     def getValues(self) -> int:
-        return ~self.__values
+        return (~self.__values & 0xFF)
 
     def setValue(self, pin: int, value: bool) -> None:
         assert isinstance(pin, int), 'pin must be an integer'