Revision 0:810519ce94bf, committed 2016-02-29

Comitter:

Hotboards

Date:

Mon Feb 29 02:30:13 2016 +0000

Commit message:

Driver to control buttons (with hardware debounce), this driver considered external pull-ups (or pull-downs) are in use

Changed in this revision

diff -r 000000000000 -r 810519ce94bf Hotboards_buttons.cpp
--- /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;
+}

diff -r 000000000000 -r 810519ce94bf Hotboards_buttons.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Hotboards_buttons.h	Mon Feb 29 02:30:13 2016 +0000
@@ -0,0 +1,98 @@
+/*
+  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.
+*/
+#ifndef Hotboards_buttons_h
+#define Hotboards_buttons_h
+
+#include "mbed.h"
+
+/** Hotboards_buttons class.
+ *  Used to read mechanical buttons
+ *
+ * Example:
+ * @code
+ * #include "Hotboards_buttons.h"
+ *
+ * Hotboards_buttons btn( 5 );
+ *
+ * int main( void )
+ * {
+ *     for(;;){
+ *         if( btn.isPressed( ) )
+ *             // do something
+ *     }
+ * }
+ * @endcode
+ */
+class Hotboards_buttons
+{
+    public :
+        /** Create Hotboards_buttons instance
+          * @param pin pin where the button will be read it
+          * @param active logic level that gives you when the button is pressed
+          *
+          * Example:
+          * @code
+          *   // instance one button on pin 5 (with pull-ups)
+          *   Hotboards_buttons btn( 5 );
+          *   // instance one button on pin 6 (with pull-downs)
+          *   Hotboards_buttons btn( 6, 1 );
+          * @endcode
+          */
+        Hotboards_buttons( PinName pin, bool active=0 );
+
+        /** Tells you if a button has been pressed (only once)
+          * @return '1' if the buttons has been pressed
+          *
+          * Example:
+          * @code
+          *   // instance one button on pin 5
+          *   Hotboards_buttons btn( 5 );
+          *   if( btn.isPressed( ) )
+          *       // do something
+          * @endcode
+          */
+        bool isPressed( void );
+
+        /** Tells you if a button has been Released (only once)
+          * @return '1' if the buttons has been Released
+          *
+          * Example:
+          * @code
+          *   // instance one button on pin 5
+          *   Hotboards_buttons btn( 5 );
+          *   if( btn.isReleased( ) )
+          *       // do something
+          * @endcode
+          */
+        bool isReleased( void );
+
+        /** Tells you the button state
+          * @return '1' if the buttons is pressed
+          *
+          * Example:
+          * @code
+          *   // instance one button on pin 5
+          *   Hotboards_buttons btn( 5 );
+          *   if( btn.istatus( ) )
+          *       // button pressed
+          *   else
+          *       // button not pressed
+          * @endcode
+          */
+        bool status( void );
+
+    private :
+        void poll( void );
+        DigitalIn _pin;
+        bool _pressed;
+        bool _lastButtonState;
+        bool _isPressed;
+        bool _isReleased;
+};
+
+#endif