Diff: button.cpp

Revision:

0:badcd0d61c7b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/button.cpp	Fri Feb 04 08:31:00 2011 +0000
@@ -0,0 +1,73 @@
+/*
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @file button.cpp
+ * @author Andre Moehl
+ * @date 01/2011
+ * @brief Button Class definition
+ */
+ 
+/*--- Includes ------------------------*/
+#include "button.h"
+
+/*--- Functions -----------------------*/
+//Contructor 
+Button::Button(PinName pin, const char *name): DigitalIn(pin,name)
+{
+    _counter = 0;
+    _samples = 10;
+    set_debounce_us(1000);
+}
+
+// sets Sample for debounce
+void Button::set_samples(int i)
+{
+        _samples = i;
+}
+
+// set debounce time
+void Button::set_debounce_us(int i)
+{
+    _ticker.attach_us(this, &Button::_callback, i);
+}
+
+// return the final state   
+int Button::read()
+{
+    return _shadow;
+}
+
+//overwrite fuction from derived "DigitalIn"
+Button::operator int()
+{
+    return read();
+}
+
+
+// counts the oscillations of the button
+void Button::_callback(void) 
+{ 
+    if (DigitalIn::read()) 
+    { 
+        if (_counter < _samples) _counter++; 
+        if (_counter == _samples) _shadow = 1; 
+    }
+    else { 
+        if (_counter > 0) _counter--; 
+        if (_counter == 0) _shadow = 0; 
+    }
+}
+
+