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92 lines
1.7 KiB
C++
92 lines
1.7 KiB
C++
//
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// FILE: CountDown.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.2
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// PURPOSE: CountDown library for Arduino
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//
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// The library is based upon millis() and therefore
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// has the same restrictions as millis() has wrt overflow.
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//
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// HISTORY:
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// 0.1.2 - 2017-07-16 added start(days, hours, minutes, seconds) + cont() == continue countdown
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// 0.1.1 - 2015-10-29 added start(h, m, s)
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// 0.1.0 - 2015-10-27 initial version
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//
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// Released to the public domain
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//
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#include "CountDown.h"
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CountDown::CountDown(const enum Resolution res)
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{
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setResolution(res);
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stop();
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}
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void CountDown::setResolution(const enum Resolution res)
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{
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_res = res;
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switch(_res)
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{
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case MICROS:
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_gettime = micros;
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break;
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case SECONDS:
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_gettime = seconds;
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break;
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case MILLIS:
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default:
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_gettime = millis;
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break;
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}
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_ticks = 0;
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}
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void CountDown::start(uint32_t ticks)
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{
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_state = CountDown::RUNNING;
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_starttime = _gettime();
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_ticks = ticks;
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}
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void CountDown::start(uint8_t days, uint8_t hours, uint8_t minutes, uint8_t seconds)
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{
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uint32_t ticks = 86400UL * days + 3600UL * hours + 60UL * minutes + seconds;
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if (ticks > 4294967) ticks = 4294967; // prevent underlying millis() overflow
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setResolution(SECONDS);
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start(ticks);
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}
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void CountDown::stop()
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{
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calcRemaining();
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_state = CountDown::STOPPED;
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}
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void CountDown::cont()
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{
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if (_state == CountDown::STOPPED)
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{
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start(_remaining);
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}
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}
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uint32_t CountDown::remaining()
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{
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calcRemaining();
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return _remaining;
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}
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void CountDown::calcRemaining()
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{
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if (_state == CountDown::RUNNING)
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{
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uint32_t t = _gettime() - _starttime;
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_remaining = _ticks > t? _ticks - t: 0;
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if (_remaining == 0)
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{
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_state = CountDown::STOPPED;
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}
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}
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}
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// END OF FILE
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