2016-07-12 02:12:58 +00:00
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//
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// DigitalPhaseLockedLoop.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 11/07/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "DigitalPhaseLockedLoop.hpp"
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2016-07-13 00:23:56 +00:00
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using namespace Storage;
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DigitalPhaseLockedLoop::DigitalPhaseLockedLoop(unsigned int clocks_per_bit, unsigned int tolerance, unsigned int length_of_history) :
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_clocks_per_bit(clocks_per_bit),
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_tolerance(tolerance),
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_length_of_history(length_of_history),
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_pulse_history(new unsigned int[length_of_history]),
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_current_window_length(clocks_per_bit),
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_next_pulse_time(0),
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_window_was_filled(false),
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_window_offset(0) {}
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void DigitalPhaseLockedLoop::run_for_cycles(unsigned int number_of_cycles)
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{
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// check whether this triggers any 0s
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_window_offset += number_of_cycles;
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if(_delegate)
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{
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while(_window_offset > _current_window_length)
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{
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if(!_window_was_filled) _delegate->digital_phase_locked_loop_output_bit(0);
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_window_was_filled = false;
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_window_offset -= _current_window_length;
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}
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}
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else
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{
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_window_offset %= _current_window_length;
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}
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2016-07-13 01:42:23 +00:00
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// update timing
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2016-07-13 00:23:56 +00:00
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_next_pulse_time += number_of_cycles;
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}
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void DigitalPhaseLockedLoop::add_pulse()
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{
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// TODO: linear regression to adjust _current_window_length and _next_pulse_time
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// therefore, there was a 1 in this window
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_window_was_filled = true;
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if(_delegate) _delegate->digital_phase_locked_loop_output_bit(1);
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// shift history one to the left, subtracting the outgoing pulse from
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unsigned int *const _pulse_history_array = _pulse_history.get();
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unsigned int outgoing_pulse_time = _pulse_history_array[0];
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for(size_t pulse = 1; pulse < _length_of_history; pulse++)
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{
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_pulse_history_array[pulse - 1] = _pulse_history_array[pulse] - outgoing_pulse_time;
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}
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_next_pulse_time -= outgoing_pulse_time;
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_pulse_history_array[_length_of_history-1] = _next_pulse_time;
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}
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