56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
/**
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* @file
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* @author Marek Bel
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*/
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#include "Timer.h"
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#include "Arduino.h"
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Timer::Timer() : m_isRunning(false), m_started()
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{
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}
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/**
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* @brief Start timer
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*/
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void Timer::start()
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{
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m_started = millis();
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m_isRunning = true;
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}
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/**
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* @brief Timer has expired
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*
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* Timer is considered expired after msPeriod has passed from time the timer was started.
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* This function must be called at least each (unsigned long maximum value - msPeriod) milliseconds to be sure to
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* catch first expiration.
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* This function is expected to handle wrap around of time register well.
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*
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* @param msPeriod Time interval in milliseconds.
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* @retval true Timer has expired
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* @retval false Timer not expired yet, or is not running, or time window in which is timer considered expired passed.
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*/
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bool Timer::expired(unsigned long msPeriod)
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{
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if (!m_isRunning) return false;
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bool expired = false;
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const unsigned long now = millis();
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if (m_started <= m_started + msPeriod)
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{
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if ((now >= m_started + msPeriod) || (now < m_started))
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{
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expired = true;
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}
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}
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else
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{
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if ((now >= m_started + msPeriod) && (now < m_started))
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{
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expired = true;
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}
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}
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if (expired) m_isRunning = false;
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return expired;
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}
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