57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
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/**
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* @file
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* @author Marek Bel
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*/
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#ifndef TIMERREMAINING_H
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#define TIMERREMAINING_H
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#include "Timer.h"
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#include "Arduino.h"
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#include "system_timer.h"
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#include <limits.h>
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class TimerRemaining : public LongTimer
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{
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public:
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TimerRemaining() : m_period(){}
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void start() = delete;
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bool expired(unsigned long msPeriod) = delete;
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/**
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* @brief Start timer
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* @param msPeriod Time to expire in milliseconds
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*/
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void start(unsigned long msPeriod)
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{
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m_period = msPeriod;
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LongTimer::start();
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}
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/**
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* @brief Time remaining to expiration
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*
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* @param msPeriod timer period in milliseconds
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* @return time remaining to expiration in milliseconds
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* @retval 0 Timer has expired, or was not even started.
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*/
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unsigned long remaining()
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{
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if (!running()) return 0;
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if (expired()) return 0;
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const unsigned long now = _millis();
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return (started() + m_period - now);
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}
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/**
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* @brief Timer has expired.
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* @retval true Timer has expired.
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* @retval false Timer has not expired.
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*/
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bool expired()
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{
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return LongTimer::expired(m_period);
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}
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private:
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unsigned long m_period; //!< Timer period in milliseconds.
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};
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#endif // ifndef TIMERREMAINING_H
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