Hotboards MX / Hotboards_buttons

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

Dependents:   buttons is_released is_pressed button_status ... more

Hotboards_buttons.cpp@0:810519ce94bf, 2016-02-29 (annotated)

Committer:
Hotboards
Date:
Mon Feb 29 02:30:13 2016 +0000
Revision:
0:810519ce94bf
Driver to control buttons (with hardware debounce),  this driver considered external pull-ups (or pull-downs) are in use

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Hotboards 0:810519ce94bf 1 /*
Hotboards 0:810519ce94bf 2 Hotboards_buttons.h - Driver to control buttons (with hardware debounce)
Hotboards 0:810519ce94bf 3 this driver considered external pull-ups (or pull-downs) are in use
Hotboards 0:810519ce94bf 4 Hotboards buttons board (http://hotboards.org)
Hotboards 0:810519ce94bf 5 Created by Diego Perez, January 16, 2016.
Hotboards 0:810519ce94bf 6 Released into the public domain.
Hotboards 0:810519ce94bf 7 */
Hotboards 0:810519ce94bf 8 #include "Hotboards_buttons.h"
Hotboards 0:810519ce94bf 9
Hotboards 0:810519ce94bf 10 Hotboards_buttons::Hotboards_buttons( PinName pin, bool active ) :
Hotboards 0:810519ce94bf 11 _pin( pin )
Hotboards 0:810519ce94bf 12 {
Hotboards 0:810519ce94bf 13 _lastButtonState = 0;
Hotboards 0:810519ce94bf 14 _pressed = active;
Hotboards 0:810519ce94bf 15 _isPressed = 0;
Hotboards 0:810519ce94bf 16 _isReleased = 0;
Hotboards 0:810519ce94bf 17 }
Hotboards 0:810519ce94bf 18
Hotboards 0:810519ce94bf 19 bool Hotboards_buttons::isPressed( void )
Hotboards 0:810519ce94bf 20 {
Hotboards 0:810519ce94bf 21 bool isPressed;
Hotboards 0:810519ce94bf 22 poll( );
Hotboards 0:810519ce94bf 23 isPressed = _isPressed;
Hotboards 0:810519ce94bf 24 _isPressed = 0;
Hotboards 0:810519ce94bf 25 return isPressed;
Hotboards 0:810519ce94bf 26 }
Hotboards 0:810519ce94bf 27
Hotboards 0:810519ce94bf 28 bool Hotboards_buttons::isReleased( void )
Hotboards 0:810519ce94bf 29 {
Hotboards 0:810519ce94bf 30 bool isReleased;
Hotboards 0:810519ce94bf 31 poll( );
Hotboards 0:810519ce94bf 32 isReleased = _isReleased;
Hotboards 0:810519ce94bf 33 _isReleased = 0;
Hotboards 0:810519ce94bf 34 return isReleased;
Hotboards 0:810519ce94bf 35 }
Hotboards 0:810519ce94bf 36
Hotboards 0:810519ce94bf 37 bool Hotboards_buttons::status( void )
Hotboards 0:810519ce94bf 38 {
Hotboards 0:810519ce94bf 39 if( _pin == _pressed ) return 1;
Hotboards 0:810519ce94bf 40 else return 0;
Hotboards 0:810519ce94bf 41 }
Hotboards 0:810519ce94bf 42
Hotboards 0:810519ce94bf 43 void Hotboards_buttons::poll( void )
Hotboards 0:810519ce94bf 44 {
Hotboards 0:810519ce94bf 45 bool buttonState;
Hotboards 0:810519ce94bf 46 // leemos el boton de la tarjeta
Hotboards 0:810519ce94bf 47 buttonState = status( );
Hotboards 0:810519ce94bf 48
Hotboards 0:810519ce94bf 49 // comparemos el estado actual con la anterior lectura
Hotboards 0:810519ce94bf 50 if( buttonState != _lastButtonState )
Hotboards 0:810519ce94bf 51 {
Hotboards 0:810519ce94bf 52 // si el estado cambio esque recien se presiono
Hotboards 0:810519ce94bf 53 if( buttonState )
Hotboards 0:810519ce94bf 54 {
Hotboards 0:810519ce94bf 55 // regresamos un uno si el boton cambio a presionado
Hotboards 0:810519ce94bf 56 _isPressed = 1;
Hotboards 0:810519ce94bf 57 }
Hotboards 0:810519ce94bf 58 else
Hotboards 0:810519ce94bf 59 {
Hotboards 0:810519ce94bf 60 // si no es que fue soltado
Hotboards 0:810519ce94bf 61 _isReleased = 1;
Hotboards 0:810519ce94bf 62 }
Hotboards 0:810519ce94bf 63 }
Hotboards 0:810519ce94bf 64 // respaldamos el esatdo actual para compararlo la sigentoie
Hotboards 0:810519ce94bf 65 // vez que preguntemos
Hotboards 0:810519ce94bf 66 _lastButtonState = buttonState;
Hotboards 0:810519ce94bf 67 }