Diff: DebouncedFallingEdgeCounter.h

Revision:

0:457832d52954

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedFallingEdgeCounter.h	Sat Feb 25 03:23:51 2012 +0000
@@ -0,0 +1,52 @@
+/* Copyright 2012 Adam Green (http://mbed.org/users/AdamGreen/)
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+/* Header file for wrapper class of InterruptIn used for counting falling edge
+   events with specified hold off time for the purpose of debouncing.
+*/
+#ifndef _DEBOUNCED_FALLING_EDGE_COUNT_H_
+#define _DEBOUNCED_FALLING_EDGE_COUNT_H_
+
+namespace AFP
+{
+
+class CDebouncedFallingEdgeCounter
+{
+protected:
+    InterruptIn     m_FallingEdgeInterruptIn;
+    // UNDONE: Run for over 30 minutes and make sure that this rolls over as expected.
+    Timer           m_Timer;
+    unsigned int    m_IgnoreTimeForDebounce;
+    unsigned int    m_LastFallingEdgeTime;
+    unsigned int    m_FallingEdgeCount;
+
+public:
+    CDebouncedFallingEdgeCounter(PinName InterruptInPin, unsigned int IgnoreTimeForDebounceInMicroSeconds);
+    
+    unsigned int GetCountAndZero();
+    void         ZeroCount();
+    unsigned int GetCount();
+
+protected:
+    void          InitLastFallingEdgeTime();
+    void          InitLastFallingEdgeTime(unsigned int CurrentTime);
+    void          FallingEdgeISR();
+    void          RefreshTimers();
+    unsigned int  TimeSinceLastFallingEdge(unsigned int CurrentTime);
+};
+
+} // namespace AFP
+using namespace AFP;
+
+#endif // _DEBOUNCED_FALLING_EDGE_COUNT_H_