qtvcp -add a very useful pyqt HAL signal

This return the pin instance as well as the state.

Author: c-morley

lib/python/qtvcp/core.py

@@ -39,6 +39,7 @@ def __new__(cls, *args, **kwargs):
 class QPin(hal.Pin, QObject):
 
     value_changed = pyqtSignal('PyQt_PyObject')
+    pinValueChanged = pyqtSignal('PyQt_PyObject','PyQt_PyObject')
     REGISTRY = []
     UPDATE = False
 
@@ -54,6 +55,7 @@ def update(self):
         tmp = self.get()
         if tmp != self._prev:
             self.value_changed.emit(tmp)
+            self.pinValueChanged.emit(self, tmp)
         self._prev = tmp
 
     def text(self):