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139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
//
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// 1770.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 17/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef _770_hpp
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#define _770_hpp
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#include "../../Storage/Disk/DiskController.hpp"
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namespace WD {
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class WD1770: public Storage::Disk::Controller {
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public:
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enum Personality {
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P1770, // implies automatic motor-on management with Type 2 commands offering a spin-up disable
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P1772, // as per the 1770, with different stepping rates
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P1773, // implements the side number-testing logic of the 1793; omits spin-up/loading logic
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P1793 // implies Type 2 commands use side number testing logic; spin-up/loading is by HLD and HLT
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};
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WD1770(Personality p);
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void set_is_double_density(bool is_double_density);
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void set_register(int address, uint8_t value);
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uint8_t get_register(int address);
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void run_for_cycles(unsigned int number_of_cycles);
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enum Flag: uint8_t {
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NotReady = 0x80,
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MotorOn = 0x80,
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WriteProtect = 0x40,
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RecordType = 0x20,
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SpinUp = 0x20,
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HeadLoaded = 0x20,
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RecordNotFound = 0x10,
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SeekError = 0x10,
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CRCError = 0x08,
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LostData = 0x04,
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TrackZero = 0x04,
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DataRequest = 0x02,
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Index = 0x02,
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Busy = 0x01
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};
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inline bool get_interrupt_request_line() { return status_.interrupt_request; }
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inline bool get_data_request_line() { return status_.data_request; }
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class Delegate {
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public:
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virtual void wd1770_did_change_output(WD1770 *wd1770) = 0;
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};
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inline void set_delegate(Delegate *delegate) { delegate_ = delegate; }
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protected:
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virtual void set_head_load_request(bool head_load);
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void set_head_loaded(bool head_loaded);
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private:
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Personality personality_;
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inline bool has_motor_on_line() { return (personality_ != P1793 ) && (personality_ != P1773); }
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inline bool has_head_load_line() { return (personality_ == P1793 ); }
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struct Status {
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Status();
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bool write_protect;
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bool record_type;
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bool spin_up;
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bool record_not_found;
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bool crc_error;
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bool seek_error;
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bool lost_data;
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bool data_request;
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bool interrupt_request;
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bool busy;
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enum {
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One, Two, Three
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} type;
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} status_;
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uint8_t track_;
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uint8_t sector_;
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uint8_t data_;
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uint8_t command_;
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int index_hole_count_;
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int index_hole_count_target_;
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int bits_since_token_;
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int distance_into_section_;
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bool is_awaiting_marker_value_;
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int step_direction_;
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void update_status(std::function<void(Status &)> updater);
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// Tokeniser
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bool is_reading_data_;
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bool is_double_density_;
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int shift_register_;
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struct Token {
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enum Type {
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Index, ID, Data, DeletedData, Byte
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} type;
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uint8_t byte_value;
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} latest_token_;
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// Events
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enum Event: int {
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Command = (1 << 0), // Indicates receipt of a new command.
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Token = (1 << 1), // Indicates recognition of a new token in the flux stream. Interrogate latest_token_ for details.
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IndexHole = (1 << 2), // Indicates the passing of a physical index hole.
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HeadLoad = (1 << 3), // Indicates the head has been loaded (1973 only).
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Timer = (1 << 4), // Indicates that the delay_time_-powered timer has timed out.
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IndexHoleTarget = (1 << 5) // Indicates that index_hole_count_ has reached index_hole_count_target_.
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};
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void posit_event(Event type);
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int interesting_event_mask_;
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int resume_point_;
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int delay_time_;
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// ID buffer
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uint8_t header_[6];
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// 1793 head-loading logic
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bool head_is_loaded_;
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// delegate
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Delegate *delegate_;
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// Storage::Disk::Controller
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virtual void process_input_bit(int value, unsigned int cycles_since_index_hole);
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virtual void process_index_hole();
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};
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}
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#endif /* _770_hpp */
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