MQTTmbed.h

00001 /*******************************************************************************
00002  * Copyright (c) 2014, 2017 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  *    Ian Craggs - change Timer member initialization to avoid copy constructor
00016  *******************************************************************************/
00017 
00018 #if !defined(MQTT_MBED_H)
00019 #define MQTT_MBED_H
00020 
00021 #include "mbed.h"
00022 
00023 class Countdown
00024 {
00025 public:
00026     Countdown() : t()
00027     {
00028 
00029     }
00030 
00031     Countdown(int ms) : t()
00032     {
00033         countdown_ms(ms);
00034     }
00035 
00036 
00037     bool expired()
00038     {
00039         return t.read_ms() >= interval_end_ms;
00040     }
00041 
00042     void countdown_ms(unsigned long ms)
00043     {
00044         t.stop();
00045         interval_end_ms = ms;
00046         t.reset();
00047         t.start();
00048     }
00049 
00050     void countdown(int seconds)
00051     {
00052         countdown_ms((unsigned long)seconds * 1000L);
00053     }
00054 
00055     int left_ms()
00056     {
00057         return interval_end_ms - t.read_ms();
00058     }
00059 
00060 private:
00061     Timer t;
00062     unsigned long interval_end_ms;
00063 };
00064 
00065 #endif