Diff: Hotboards_buttons.cpp

Revision:

0:810519ce94bf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Hotboards_buttons.cpp	Mon Feb 29 02:30:13 2016 +0000
@@ -0,0 +1,67 @@
+/*
+  Hotboards_buttons.h - Driver to control buttons (with hardware debounce)
+  this driver considered external pull-ups (or pull-downs) are in use
+  Hotboards buttons board (http://hotboards.org)
+  Created by Diego Perez, January 16, 2016.
+  Released into the public domain.
+*/
+#include "Hotboards_buttons.h"
+
+Hotboards_buttons::Hotboards_buttons( PinName pin, bool active ) :
+   _pin( pin )
+{
+    _lastButtonState = 0;
+    _pressed = active;
+    _isPressed = 0;
+    _isReleased = 0;
+}
+
+bool Hotboards_buttons::isPressed( void )
+{
+    bool isPressed;
+    poll( );
+    isPressed = _isPressed;
+    _isPressed = 0;
+    return isPressed;
+}
+
+bool Hotboards_buttons::isReleased( void )
+{
+    bool isReleased;
+    poll( );
+    isReleased = _isReleased;
+    _isReleased = 0;
+    return isReleased;
+}
+
+bool Hotboards_buttons::status( void )
+{
+    if( _pin == _pressed ) return 1;
+    else return 0;
+}
+
+void Hotboards_buttons::poll( void )
+{
+    bool buttonState;
+    // leemos el boton de la tarjeta
+    buttonState = status( );
+
+    // comparemos el estado actual con la anterior lectura
+    if( buttonState != _lastButtonState )
+    {
+        // si el estado cambio esque recien se presiono
+        if( buttonState )
+        {
+            // regresamos un uno si el boton cambio a presionado
+            _isPressed = 1;
+        }
+        else
+        {
+            // si no es que fue soltado
+            _isReleased = 1;
+        }
+    }
+    // respaldamos el esatdo actual para compararlo la sigentoie
+    // vez que preguntemos
+    _lastButtonState = buttonState;
+}