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