TimeoutTimer.cpp

00001 /**
00002  * ACKme WiConnect Host Library is licensed under the BSD licence: 
00003  * 
00004  * Copyright (c)2014 ACKme Networks.
00005  * All rights reserved. 
00006  * 
00007  * Redistribution and use in source and binary forms, with or without modification, 
00008  * are permitted provided that the following conditions are met: 
00009  * 
00010  * 1. Redistributions of source code must retain the above copyright notice, 
00011  * this list of conditions and the following disclaimer. 
00012  * 2. Redistributions in binary form must reproduce the above copyright notice, 
00013  * this list of conditions and the following disclaimer in the documentation 
00014  * and/or other materials provided with the distribution. 
00015  * 3. The name of the author may not be used to endorse or promote products 
00016  * derived from this software without specific prior written permission. 
00017  * 
00018  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS AND ANY EXPRESS OR IMPLIED 
00019  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
00020  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
00021  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
00022  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
00023  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
00026  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
00027  * OF SUCH DAMAGE.
00028  */
00029 
00030 #include "Wiconnect.h"
00031 #include "us_ticker_api.h"
00032 
00033 /*************************************************************************************************/
00034 TimeoutTimer::TimeoutTimer()
00035 {
00036     _start = 0;
00037     us_ticker_init();
00038 }
00039 
00040 /*************************************************************************************************/
00041 void TimeoutTimer::reset(void)
00042 {
00043     _start = us_ticker_read();
00044 }
00045 
00046 /*************************************************************************************************/
00047 TimerTimeout TimeoutTimer::remainingMs(TimerTimeout timeoutMs)
00048 {
00049     volatile TimerTimeout diff = readMs();
00050     return (timeoutMs > diff) ? (timeoutMs - diff) : 0;
00051 }
00052 
00053 /*************************************************************************************************/
00054 TimerTimeout TimeoutTimer::readMs()
00055 {
00056     volatile TimerTimeout now = us_ticker_read();
00057     TimerTimeout remaining = (now > _start) ? (now - _start) : ((ULONG_MAX - _start) + now);
00058     return remaining / 1000;
00059 }
00060 
00061 /*************************************************************************************************/
00062 bool TimeoutTimer::timedOut(TimerTimeout timeoutMs)
00063 {
00064     volatile TimerTimeout now = us_ticker_read();
00065     return ((now - _start) / 1000) > timeoutMs;
00066 }