DebouncedInterrupt.h

00001 
00002 /** A replacement for InterruptIn that debounces the interrupt
00003  *  Anil Kandangath
00004  *
00005  * @code
00006  *
00007  * #include "DebouncedInterrupt.h"
00008  *
00009  * DebouncedInterrupt up_button(p15);
00010  * 
00011  * void onUp()
00012  * {
00013  *    // Do Something
00014  * }
00015  * 
00016  * int main()
00017  * {
00018  *     up_button.attach(&onUp, 100);
00019  *     while(1) {
00020  *         ...
00021  *     }
00022  * }
00023  * @endcode
00024  */
00025  
00026 #ifndef DEBOUNCED_INTERRUPT_H
00027 #define DEBOUNCED_INTERRUPT_H
00028 
00029 #include <stdint.h>
00030 #include "mbed.h"
00031 
00032 class DebouncedInterrupt {
00033 private:
00034     unsigned int _debounce_us;
00035     InterruptIn *_in;
00036     DigitalIn *_din;
00037     
00038     // Diagnostics
00039     volatile unsigned int _bounce_count;
00040     volatile unsigned int _last_bounce_count;
00041     
00042     void (*fCallback)(void);
00043     void _onInterrupt(void);
00044     void _callback(void);
00045 public:
00046     DebouncedInterrupt(PinName pin);
00047     ~DebouncedInterrupt();
00048     
00049     // Start monitoring the interupt and attach a callback
00050     void attach(void (*fptr)(void), const uint32_t& debounce_ms=10);
00051    
00052     // Stop monitoring the interrupt
00053     void reset();
00054     
00055     
00056     /*
00057     * Get number of bounces 
00058     * @return: bounce count
00059     */
00060     unsigned int get_bounce();
00061 };
00062 #endif