mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-23 03:32:32 +00:00
93 lines
2.1 KiB
C++
93 lines
2.1 KiB
C++
//
|
|
// 1770.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 17/09/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef _770_hpp
|
|
#define _770_hpp
|
|
|
|
#include "../../Storage/Disk/DiskController.hpp"
|
|
|
|
namespace WD {
|
|
|
|
class WD1770: public Storage::Disk::Controller {
|
|
public:
|
|
WD1770();
|
|
|
|
void set_is_double_density(bool is_double_density);
|
|
void set_register(int address, uint8_t value);
|
|
uint8_t get_register(int address);
|
|
|
|
void run_for_cycles(unsigned int number_of_cycles);
|
|
|
|
enum Flag: uint8_t {
|
|
MotorOn = 0x80,
|
|
WriteProtect = 0x40,
|
|
RecordType = 0x20,
|
|
SpinUp = 0x20,
|
|
RecordNotFound = 0x10,
|
|
SeekError = 0x10,
|
|
CRCError = 0x08,
|
|
LostData = 0x04,
|
|
TrackZero = 0x04,
|
|
DataRequest = 0x02,
|
|
Index = 0x02,
|
|
Busy = 0x01
|
|
};
|
|
|
|
private:
|
|
uint8_t status_;
|
|
uint8_t track_;
|
|
uint8_t sector_;
|
|
uint8_t data_;
|
|
uint8_t command_;
|
|
|
|
int index_hole_count_;
|
|
int index_hole_count_target_;
|
|
int bits_since_token_;
|
|
int distance_into_section_;
|
|
bool is_awaiting_marker_value_;
|
|
|
|
int step_direction_;
|
|
void set_interrupt_request(bool interrupt_request) {}
|
|
|
|
// Tokeniser
|
|
bool is_reading_data_;
|
|
bool is_double_density_;
|
|
int shift_register_;
|
|
struct Token {
|
|
enum Type {
|
|
Index, ID, Data, DeletedData, Byte
|
|
} type;
|
|
uint8_t byte_value;
|
|
} latest_token_;
|
|
|
|
// Events
|
|
enum Event: int {
|
|
Command = (1 << 0), // Indicates receipt of a new command.
|
|
Token = (1 << 1), // Indicates recognition of a new token in the flux stream. Interrogate latest_token_ for details.
|
|
IndexHole = (1 << 2), // Indicates the passing of a physical index hole.
|
|
|
|
Timer = (1 << 3), // Indicates that the delay_time_-powered timer has timed out.
|
|
IndexHoleTarget = (1 << 4) // Indicates that index_hole_count_ has reached index_hole_count_target_.
|
|
};
|
|
void posit_event(Event type);
|
|
int interesting_event_mask_;
|
|
int resume_point_;
|
|
int delay_time_;
|
|
|
|
// ID buffer
|
|
uint8_t header[6];
|
|
|
|
//
|
|
virtual void process_input_bit(int value, unsigned int cycles_since_index_hole);
|
|
virtual void process_index_hole();
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* _770_hpp */
|