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CLK/Storage/Disk/DigitalPhaseLockedLoop.hpp

72 lines
1.5 KiB
C++

//
// DigitalPhaseLockedLoop.hpp
// Clock Signal
//
// Created by Thomas Harte on 11/07/2016.
// Copyright © 2016 Thomas Harte. All rights reserved.
//
#ifndef DigitalPhaseLockedLoop_hpp
#define DigitalPhaseLockedLoop_hpp
#include <memory>
#include <vector>
#include "../../ClockReceiver/ClockReceiver.hpp"
namespace Storage {
class DigitalPhaseLockedLoop {
public:
/*!
Instantiates a @c DigitalPhaseLockedLoop.
@param clocks_per_bit The expected number of cycles between each bit of input.
@param length_of_history The number of historic pulses to consider in locking to phase.
*/
DigitalPhaseLockedLoop(int clocks_per_bit, size_t length_of_history);
/*!
Runs the loop, impliedly posting no pulses during that period.
@c number_of_cycles The time to run the loop for.
*/
void run_for(const Cycles cycles);
/*!
Announces a pulse at the current time.
*/
void add_pulse();
/*!
A receiver for PCM output data; called upon every recognised bit.
*/
class Delegate {
public:
virtual void digital_phase_locked_loop_output_bit(int value) = 0;
};
void set_delegate(Delegate *delegate) {
delegate_ = delegate;
}
private:
Delegate *delegate_;
void post_phase_offset(int phase, int offset);
std::vector<int> offset_history_;
size_t offset_history_pointer_;
int offset_;
int phase_;
int window_length_;
bool window_was_filled_;
int clocks_per_bit_;
int tolerance_;
};
}
#endif /* DigitalPhaseLockedLoop_hpp */