Countdown.h

00001 /*******************************************************************************
00002  * Copyright (c) 2014 IBM Corp.
00003  *
00004  * All rights reserved. This program and the accompanying materials
00005  * are made available under the terms of the Eclipse Public License v1.0
00006  * and Eclipse Distribution License v1.0 which accompany this distribution.
00007  *
00008  * The Eclipse Public License is available at
00009  *    http://www.eclipse.org/legal/epl-v10.html
00010  * and the Eclipse Distribution License is available at
00011  *   http://www.eclipse.org/org/documents/edl-v10.php.
00012  *
00013  * Contributors:
00014  *    Ian Craggs - initial API and implementation and/or initial documentation
00015  *******************************************************************************/
00016 
00017 #if !defined(COUNTDOWN_H)
00018 #define COUNTDOWN_H
00019 
00020 class Countdown
00021 {
00022 public:
00023     Countdown()
00024     {  
00025         interval_end_ms = 0L;
00026     }
00027     
00028     Countdown(int ms)
00029     {
00030         countdown_ms(ms);   
00031     }
00032     
00033     bool expired()
00034     {
00035         return (interval_end_ms > 0L) && (millis() >= interval_end_ms);
00036     }
00037     
00038     void countdown_ms(unsigned long ms)  
00039     {
00040         interval_end_ms = millis() + ms;
00041     }
00042     
00043     void countdown(int seconds)
00044     {
00045         countdown_ms((unsigned long)seconds * 1000L);
00046     }
00047     
00048     int left_ms()
00049     {
00050         return interval_end_ms - millis();
00051     }
00052     
00053 private:
00054     unsigned long interval_end_ms; 
00055 };
00056 
00057 #endif