TimerEvent.h

00001 /* mbed Microcontroller Library - TimerEvent
00002  * Copyright (c) 2007-2009 ARM Limited. All rights reserved.
00003  */ 
00004  
00005 #ifndef MBED_TIMEREVENT_H
00006 #define MBED_TIMEREVENT_H
00007 
00008 namespace mbed {
00009 
00010 /** Base abstraction for timer interrupts
00011 */
00012 class TimerEvent {
00013 
00014 public:
00015 
00016     TimerEvent();
00017     
00018     /** The handler registered with the underlying timer interrupt
00019      */
00020     static void irq();
00021 
00022     /** Destruction removes it...
00023      */
00024     virtual ~TimerEvent();
00025 
00026 protected:
00027 
00028     /** The handler called to service the timer event of the derived class
00029      */
00030     virtual void handler() = 0;
00031     
00032     /** Insert in to linked list
00033      */
00034     void insert(unsigned int timestamp);
00035     
00036     /** Remove from linked list, if in it
00037      */
00038     void remove();
00039     
00040     /** Get the current usec timestamp
00041      */
00042     static unsigned int timestamp();
00043 
00044     /** The head of the list of the events, NULL if none
00045      */
00046     static TimerEvent *_head;
00047     
00048     /** Pointer to the next in the list, NULL if last
00049      */
00050     TimerEvent *_next;
00051     
00052     /** The timestamp at which the even should be triggered
00053      */
00054     unsigned int _timestamp;
00055 
00056 };
00057 
00058 } // namespace mbed
00059 
00060 #endif