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CLK/Storage/Tape/Parsers/Acorn.hpp

75 lines
1.6 KiB
C++

//
// Acorn.hpp
// Clock Signal
//
// Created by Thomas Harte on 06/11/2016.
// Copyright © 2016 Thomas Harte. All rights reserved.
//
#ifndef Storage_Tape_Parsers_Acorn_hpp
#define Storage_Tape_Parsers_Acorn_hpp
#include "TapeParser.hpp"
#include "../../../NumberTheory/CRC.hpp"
#include "../../Disk/DPLL/DigitalPhaseLockedLoop.hpp"
namespace Storage {
namespace Tape {
namespace Acorn {
class Shifter: public Storage::DigitalPhaseLockedLoop::Delegate {
public:
Shifter();
void process_pulse(const Storage::Tape::Tape::Pulse &pulse);
class Delegate {
public:
virtual void acorn_shifter_output_bit(int value) = 0;
};
void set_delegate(Delegate *delegate) {
delegate_ = delegate;
}
void digital_phase_locked_loop_output_bit(int value);
private:
Storage::DigitalPhaseLockedLoop pll_;
bool was_high_;
unsigned int input_pattern_;
unsigned int input_bit_counter_;
Delegate *delegate_;
};
enum class SymbolType {
One, Zero
};
class Parser: public Storage::Tape::Parser<SymbolType>, public Shifter::Delegate {
public:
Parser();
int get_next_bit(const std::shared_ptr<Storage::Tape::Tape> &tape);
int get_next_byte(const std::shared_ptr<Storage::Tape::Tape> &tape);
unsigned int get_next_short(const std::shared_ptr<Storage::Tape::Tape> &tape);
unsigned int get_next_word(const std::shared_ptr<Storage::Tape::Tape> &tape);
void reset_crc();
uint16_t get_crc();
void acorn_shifter_output_bit(int value);
void process_pulse(const Storage::Tape::Tape::Pulse &pulse);
private:
bool did_update_shifter(int new_value, int length);
NumberTheory::CRC16 crc_;
Shifter shifter_;
};
}
}
}
#endif /* Acorn_hpp */