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237 lines
7.0 KiB
C++
237 lines
7.0 KiB
C++
//
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// Electron.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 03/01/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Electron_hpp
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#define Electron_hpp
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#include "../../Processors/6502/CPU6502.hpp"
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#include "../../Storage/Tape/Tape.hpp"
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#include "../CRTMachine.hpp"
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#include "../Typer.hpp"
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#include <cstdint>
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namespace Electron {
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enum ROMSlot: uint8_t {
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ROMSlot0 = 0,
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ROMSlot1, ROMSlot2, ROMSlot3,
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ROMSlot4, ROMSlot5, ROMSlot6, ROMSlot7,
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ROMSlotKeyboard = 8, ROMSlot9,
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ROMSlotBASIC = 10, ROMSlot11,
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ROMSlot12, ROMSlot13, ROMSlot14, ROMSlot15,
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ROMSlotOS
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};
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enum Interrupt: uint8_t {
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PowerOnReset = 0x02,
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DisplayEnd = 0x04,
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RealTimeClock = 0x08,
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ReceiveDataFull = 0x10,
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TransmitDataEmpty = 0x20,
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HighToneDetect = 0x40
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};
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enum Key: uint16_t {
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KeySpace = 0x0000 | 0x08, KeyCopy = 0x0000 | 0x02, KeyRight = 0x0000 | 0x01,
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KeyDelete = 0x0010 | 0x08, KeyReturn = 0x0010 | 0x04, KeyDown = 0x0010 | 0x02, KeyLeft = 0x0010 | 0x01,
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KeyColon = 0x0020 | 0x04, KeyUp = 0x0020 | 0x02, KeyMinus = 0x0020 | 0x01,
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KeySlash = 0x0030 | 0x08, KeySemiColon = 0x0030 | 0x04, KeyP = 0x0030 | 0x02, Key0 = 0x0030 | 0x01,
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KeyFullStop = 0x0040 | 0x08, KeyL = 0x0040 | 0x04, KeyO = 0x0040 | 0x02, Key9 = 0x0040 | 0x01,
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KeyComma = 0x0050 | 0x08, KeyK = 0x0050 | 0x04, KeyI = 0x0050 | 0x02, Key8 = 0x0050 | 0x01,
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KeyM = 0x0060 | 0x08, KeyJ = 0x0060 | 0x04, KeyU = 0x0060 | 0x02, Key7 = 0x0060 | 0x01,
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KeyN = 0x0070 | 0x08, KeyH = 0x0070 | 0x04, KeyY = 0x0070 | 0x02, Key6 = 0x0070 | 0x01,
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KeyB = 0x0080 | 0x08, KeyG = 0x0080 | 0x04, KeyT = 0x0080 | 0x02, Key5 = 0x0080 | 0x01,
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KeyV = 0x0090 | 0x08, KeyF = 0x0090 | 0x04, KeyR = 0x0090 | 0x02, Key4 = 0x0090 | 0x01,
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KeyC = 0x00a0 | 0x08, KeyD = 0x00a0 | 0x04, KeyE = 0x00a0 | 0x02, Key3 = 0x00a0 | 0x01,
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KeyX = 0x00b0 | 0x08, KeyS = 0x00b0 | 0x04, KeyW = 0x00b0 | 0x02, Key2 = 0x00b0 | 0x01,
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KeyZ = 0x00c0 | 0x08, KeyA = 0x00c0 | 0x04, KeyQ = 0x00c0 | 0x02, Key1 = 0x00c0 | 0x01,
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KeyShift = 0x00d0 | 0x08, KeyControl = 0x00d0 | 0x04, KeyFunc = 0x00d0 | 0x02, KeyEscape = 0x00d0 | 0x01,
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KeyBreak = 0xffff,
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TerminateSequence = 0, NotMapped = 0xfffe,
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};
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class Tape: public Storage::TapePlayer {
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public:
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Tape();
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inline void run_for_cycles(unsigned int number_of_cycles);
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inline uint8_t get_data_register();
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inline void set_data_register(uint8_t value);
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inline void set_counter(uint8_t value);
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inline uint8_t get_interrupt_status() { return _interrupt_status; }
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inline 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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inline void set_is_in_input_mode(bool is_in_input_mode);
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private:
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void process_input_pulse(Storage::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;
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} _input;
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struct {
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unsigned int cycles_into_pulse;
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unsigned int bits_remaining_until_empty;
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} _output;
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bool _is_running;
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bool _is_enabled;
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bool _is_in_input_mode;
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inline void evaluate_interrupts();
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uint16_t _data_register;
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uint8_t _interrupt_status, _last_posted_interrupt_status;
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Delegate *_delegate;
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enum {
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Long, Short, Unrecognised, Recognised
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} _crossings[4];
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};
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class Speaker: public ::Outputs::Filter<Speaker> {
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public:
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void set_divider(uint8_t divider);
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void set_is_enabled(bool is_enabled);
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inline bool get_is_enabled() { return _is_enabled; }
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void get_samples(unsigned int number_of_samples, int16_t *target);
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void skip_samples(unsigned int number_of_samples);
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private:
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unsigned int _counter;
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unsigned int _divider;
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bool _is_enabled;
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};
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/*!
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@abstract Represents an Acorn Electron.
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@discussion An instance of Electron::Machine represents the current state of an
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Acorn Electron.
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*/
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class Machine:
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public CPU6502::Processor<Machine>,
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public CRTMachine::Machine,
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Tape::Delegate,
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public Utility::TypeRecipient {
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public:
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Machine();
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void set_rom(ROMSlot slot, size_t length, const uint8_t *data);
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void set_tape(std::shared_ptr<Storage::Tape> tape);
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void set_key_state(Key key, bool isPressed);
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void clear_all_keys();
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inline void set_use_fast_tape_hack(bool activate) { _use_fast_tape_hack = activate; }
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// to satisfy CPU6502::Processor
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unsigned int perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value);
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void synchronise();
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// to satisfy CRTMachine::Machine
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virtual void setup_output(float aspect_ratio);
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virtual void close_output();
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virtual std::shared_ptr<Outputs::CRT::CRT> get_crt() { return _crt; }
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virtual std::shared_ptr<Outputs::Speaker> get_speaker() { return _speaker; }
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virtual void run_for_cycles(int number_of_cycles) { CPU6502::Processor<Machine>::run_for_cycles(number_of_cycles); }
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virtual double get_clock_rate() { return 2000000; }
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// to satisfy Tape::Delegate
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virtual void tape_did_change_interrupt_status(Tape *tape);
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// for Utility::TypeRecipient
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virtual int get_typer_delay();
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virtual int get_typer_frequency();
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virtual bool typer_set_next_character(Utility::Typer *typer, char character, int phase);
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private:
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inline void update_display();
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inline void start_pixel_line();
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inline void end_pixel_line();
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inline void output_pixels(unsigned int number_of_cycles);
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inline void update_audio();
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inline void signal_interrupt(Interrupt interrupt);
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inline void clear_interrupt(Interrupt interrupt);
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inline void evaluate_interrupts();
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// Things that directly constitute the memory map.
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uint8_t _roms[16][16384];
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uint8_t _os[16384], _ram[32768];
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// Things affected by registers, explicitly or otherwise.
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uint8_t _interrupt_status, _interrupt_control;
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uint8_t _palette[16];
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uint8_t _key_states[14];
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ROMSlot _active_rom;
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bool _keyboard_is_active, _basic_is_active;
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uint8_t _screen_mode;
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uint16_t _screenModeBaseAddress;
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uint16_t _startScreenAddress;
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// Counters related to simultaneous subsystems
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unsigned int _frameCycles, _displayOutputPosition;
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unsigned int _audioOutputPosition, _audioOutputPositionError;
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uint8_t _phase;
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struct {
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uint16_t forty1bpp[256];
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uint8_t forty2bpp[256];
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uint32_t eighty1bpp[256];
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uint16_t eighty2bpp[256];
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uint8_t eighty4bpp[256];
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} _paletteTables;
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// Display generation.
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uint16_t _startLineAddress, _currentScreenAddress;
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int _current_pixel_line, _current_pixel_column, _current_character_row;
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uint8_t _last_pixel_byte;
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bool _isBlankLine;
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// CRT output
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uint8_t *_current_output_target, *_initial_output_target;
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unsigned int _current_output_divider;
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// Tape
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Tape _tape;
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bool _use_fast_tape_hack;
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bool _fast_load_is_in_data;
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// Outputs
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std::shared_ptr<Outputs::CRT::CRT> _crt;
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std::shared_ptr<Speaker> _speaker;
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};
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}
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#endif /* Electron_hpp */
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