joystick.hpp

00001 #ifndef JOYSTICK_H
00002 #define JOYSTICK_H
00003 
00004 #include <mbed.h>
00005 
00006 class Joystick{
00007     private:
00008         class Button {
00009             protected:          
00010                 Callback<void()> _callback_rise;
00011                 Callback<void()> _callback_fall;
00012             public:
00013                 InterruptIn     _irqpin;
00014 
00015                 enum Edge { RisingEdge = 0, FallingEdge };
00016                 
00017                 Button(PinName p, PinMode mode = PullUp) : _irqpin(p, mode) {
00018                     _irqpin.rise(callback(this, &Button::call_rise));
00019                     _irqpin.fall(callback(this, &Button::call_fall));
00020                 }
00021                 
00022                 void attach(Edge edge, Callback<void()> cb) { 
00023                     if (edge == RisingEdge) _callback_rise = cb ; 
00024                     else {                  _callback_fall = cb ; }
00025                 }
00026                  
00027                 void call_rise(void) { if (_callback_rise) _callback_rise.call(); }
00028                 void call_fall(void) { if (_callback_fall) _callback_fall.call(); }
00029         };
00030 
00031         Button _key_up;
00032         Button _key_down;
00033         Button _key_left;
00034         Button _key_right;
00035         Button _key_select;
00036     public:
00037         enum Action { Press = 0, Release };
00038         enum Direction { Up, Down, Left, Right, Select };
00039         
00040         Joystick(PinName key_up = PI_8,    \
00041                  PinName key_down = PI_10,  \
00042                  PinName key_left = PI_9,    \
00043                  PinName key_right = PF_11,   \
00044                  PinName key_select = PC_13) : \
00045         _key_up(key_up, PullDown), \
00046         _key_down(key_down, PullDown),\
00047         _key_left(key_left, PullDown),\
00048         _key_right(key_right, PullDown),\
00049         _key_select(key_select, PullDown)
00050         {
00051         }
00052 
00053         void attach(Direction direction, Action action, Callback<void()> cb) { 
00054             Button * button;
00055             switch(direction){
00056                 case Up:
00057                 button = &_key_up;
00058                 break;
00059                 case Down:
00060                 button = &_key_down;
00061                 break;
00062                 case Left:
00063                 button = &_key_left;
00064                 break;
00065                 case Right:
00066                 button = &_key_right;
00067                 break;
00068                 case Select:
00069                 button = &_key_select;
00070                 break;
00071             }           
00072             if (action == Press)    button->attach( Button::RisingEdge,  cb ); 
00073             else                    button->attach( Button::FallingEdge, cb ); 
00074         }
00075 };
00076 
00077 #endif