stop_watch.hpp

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/*
 *     SocialLedge.com - Copyright (C) 2013
 *
 *     This file is part of free software framework for embedded processors.
 *     You can use it and/or distribute it as long as this copyright header
 *     remains unmodified.  The code is free for personal use and requires
 *     permission to use in a commercial product.
 *
 *      THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
 *      OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
 *      MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 *      I SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
 *      CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
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 *     You can reach the author of this software at :
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 */

#ifndef STOP_WATCH_H_
#define STOP_WATCH_H_

#include <stdint.h>
#include "lpc_sys.h"



class MicroSecondStopWatch
{
    public:
        MicroSecondStopWatch() : mStartValue(0), mStopValue(0) { start(); }

        inline void start(void)    { mStartValue = mStopValue = getTimerValue(); }

        inline void stop(void)     { mStopValue = getTimerValue(); }

        inline uint64_t getCapturedTime(void) const { return (mStopValue - mStartValue); }

        inline uint64_t getElapsedTime (void) const { return (getTimerValue() - mStartValue); }

    private:
        inline uint64_t getTimerValue(void) const { return sys_get_uptime_us(); }

        uint64_t mStartValue;   
        uint64_t mStopValue;    
};



#ifdef TESTING
static inline void test_stop_watch_file(void)
{
    MicroSecondStopWatch w;
    assert(0 == w.getCapturedTime());
    assert(0 == w.getElapsedTime());
    w.start();
    delay_ms(5);
    assert(0 == w.getCapturedTime());
    w.stop();
    assert(w.getCapturedTime() >= 5000 && w.getCapturedTime() <= 6000);
}
#endif /* #ifdef TESTING */



#endif /* STOP_WATCH_H_ */