Module level variable: LastButtonState, LastPinState

FUNCTION InitButtonDebounce
	
	Initialize the port line to monitor the button
    Sample the button port pin and use it to initialize LastPinState
    Set CurrentState to be DEBOUNCING
    Start debounce timer (timer posts to ButtonDebounceSM)
    post the initial transition event
END InitButtonDebounce





FUNCTION RunButtonDebounce(ES_Event_t ThisEvent)

Local Variables: ReturnEvent, NextButtonState
Set ReturnEvent to ES_NO_EVENT

If our current state is debouncing
  If EventType is ES_TIMEOUT
        Set NextButtonState to Ready2Sample;
  End If
End If

If our current state is Ready2Sample
    If our event is START_BUTTON_UP 
		Start debounce timer
        Set the next state to Debouncing;
	End If
	
	If our event is START_BUTTON_UP 
      Start debounce timer
      Set next state
      Post Debounced start button event up to master SM_
    End If
End If

Update LastButtonState
Return ReturnEvent

END RunButtonDebounce




FUNCTION CheckStartButton

Local Variables:  CurrentPinState, ReturnVal
Set ReturnVal to false

Set CurrentPinState to state read from port pin

If the CurrentPinState is different from the LastButtonState
  If the CurrentPinState is LOW (Button down)
	PostEvent ButtonDown to ButtonDebounce queue
  Otherwise
    PostEvent ButtonUp to ButtonDebounce queue
  End If
    Set ReturnVal to true
End If

Set LastPinState to CurrentPinState

Return ReturnVal

END CheckStartButton