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79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
//
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// Tape.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 03/12/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Electron_Tape_h
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#define Electron_Tape_h
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#include <cstdint>
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#include "../../ClockReceiver/ClockReceiver.hpp"
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#include "../../Storage/Tape/Tape.hpp"
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#include "../../Storage/Tape/Parsers/Acorn.hpp"
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#include "Interrupts.hpp"
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namespace Electron {
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class Tape:
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public Storage::Tape::TapePlayer,
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public Storage::Tape::Acorn::Shifter::Delegate {
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public:
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Tape();
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void run_for(const Cycles cycles);
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using Storage::Tape::TapePlayer::run_for;
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uint8_t get_data_register();
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void set_data_register(uint8_t value);
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void set_counter(uint8_t value);
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inline uint8_t get_interrupt_status() { return interrupt_status_; }
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void clear_interrupts(uint8_t interrupts);
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class Delegate {
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public:
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virtual void tape_did_change_interrupt_status(Tape *tape) = 0;
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};
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inline void set_delegate(Delegate *delegate) { delegate_ = delegate; }
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inline void set_is_running(bool is_running) { is_running_ = is_running; }
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inline void set_is_enabled(bool is_enabled) { is_enabled_ = is_enabled; }
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void set_is_in_input_mode(bool is_in_input_mode);
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void acorn_shifter_output_bit(int value);
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private:
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void process_input_pulse(const Storage::Tape::Tape::Pulse &pulse);
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inline void push_tape_bit(uint16_t bit);
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inline void get_next_tape_pulse();
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struct {
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int minimum_bits_until_full = 0;
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} input_;
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struct {
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unsigned int cycles_into_pulse = 0;
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unsigned int bits_remaining_until_empty = 0;
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} output_;
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bool is_running_ = false;
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bool is_enabled_ = false;
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bool is_in_input_mode_ = false;
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inline void evaluate_interrupts();
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uint16_t data_register_ = 0;
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uint8_t interrupt_status_ = 0;
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uint8_t last_posted_interrupt_status_ = 0;
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Delegate *delegate_ = nullptr;
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::Storage::Tape::Acorn::Shifter shifter_;
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};
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}
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#endif /* Electron_Tape_h */
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