Diff: DebouncedIn.cpp

Revision:

0:323110faffe5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DebouncedIn.cpp	Fri Aug 16 17:49:32 2013 +0000
@@ -0,0 +1,57 @@
+#include "DebouncedIn.h"
+#include "mbed.h"
+
+#define CHECK_MSEC 5 // Read hardware every 5 msec 
+#define PRESS_MSEC 100 // Stable time before registering pressed 
+#define RELEASE_MSEC 100 // Stable time before registering released
+ 
+
+bool DebounceKeyPress = false;
+ /*v
+  * Constructor
+  */
+ DebouncedIn::DebouncedIn(PinName pin): _pin(pin)
+ {    
+	  _pin.mode(PullDown);
+    _poll.attach(this, &DebouncedIn::CheckState, 0.005);     
+ }
+ 
+ bool DebouncedIn::get()
+ {
+	 return(DebounceKeyPress);
+ }
+ 
+ bool DebouncedIn::get_pin()
+ {
+	 return(_pin);
+ }
+ 
+ 
+ void DebouncedIn::CheckState()
+ {
+	 static int Count = RELEASE_MSEC / CHECK_MSEC;
+	 bool RawState = DebouncedIn::get_pin();
+	 if(RawState==DebounceKeyPress)
+	 {
+		 if(DebounceKeyPress)
+			Count = RELEASE_MSEC / CHECK_MSEC;
+		 else
+			Count = PRESS_MSEC / CHECK_MSEC; 
+	 }
+	 else
+	 {
+		 if(--Count == 0)
+		 {
+			 DebounceKeyPress = RawState;
+			 if(DebounceKeyPress)
+				Count = RELEASE_MSEC / CHECK_MSEC;
+			 else
+				Count = PRESS_MSEC / CHECK_MSEC; 
+				 
+		 }
+	 }
+	 
+ }
+
+
+ 
\ No newline at end of file