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74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
//
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// TimedEventLoop.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 29/07/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "TimedEventLoop.hpp"
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#include "../NumberTheory/Factors.hpp"
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#include <algorithm>
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using namespace Storage;
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TimedEventLoop::TimedEventLoop(unsigned int input_clock_rate) :
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_input_clock_rate(input_clock_rate) {}
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void TimedEventLoop::run_for_cycles(int number_of_cycles)
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{
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_cycles_until_event -= number_of_cycles;
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while(_cycles_until_event <= 0)
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{
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process_next_event();
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}
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}
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unsigned int TimedEventLoop::get_cycles_until_next_event()
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{
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return (unsigned int)std::max(_cycles_until_event, 0);
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}
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void TimedEventLoop::reset_timer()
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{
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_error.set_zero();
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_cycles_until_event = 0;
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}
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void TimedEventLoop::reset_timer_to_offset(Time offset)
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{
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/* unsigned int common_clock_rate = NumberTheory::least_common_multiple(offset.clock_rate, _event_interval.clock_rate);
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_time_into_interval = offset.length * (common_clock_rate / offset.clock_rate);
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_event_interval.length *= common_clock_rate / _event_interval.clock_rate;
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_event_interval.clock_rate = common_clock_rate;
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if(common_clock_rate != _stepper->get_output_rate())
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{
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_stepper.reset(new SignalProcessing::Stepper(_event_interval.clock_rate, _input_clock_rate));
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}*/
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}
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void TimedEventLoop::jump_to_next_event()
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{
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reset_timer();
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process_next_event();
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}
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void TimedEventLoop::set_next_event_time_interval(Time interval)
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{
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unsigned int common_divisor = NumberTheory::greatest_common_divisor(_error.clock_rate, interval.clock_rate);
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uint64_t denominator = (interval.clock_rate * _error.clock_rate) / common_divisor;
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uint64_t numerator = (_error.clock_rate / common_divisor) * _input_clock_rate * interval.length - (interval.clock_rate / common_divisor) * _error.length;
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_cycles_until_event = (int)(numerator / denominator);
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_error.length = (unsigned int)(numerator % denominator);
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_error.clock_rate = (unsigned int)denominator;
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_error.simplify();
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}
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Time TimedEventLoop::get_time_into_next_event()
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{
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Time result = _event_interval;
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// result.length = _time_into_interval;
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return result;
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}
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