mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-26 08:49:37 +00:00
100 lines
2.7 KiB
C++
100 lines
2.7 KiB
C++
//
|
|
// DiskController.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 14/07/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef Storage_Disk_Controller_hpp
|
|
#define Storage_Disk_Controller_hpp
|
|
|
|
#include "Drive.hpp"
|
|
#include "DigitalPhaseLockedLoop.hpp"
|
|
#include "../TimedEventLoop.hpp"
|
|
|
|
namespace Storage {
|
|
namespace Disk {
|
|
|
|
/*!
|
|
Provides the shell for emulating a disk controller — something that is connected to a disk drive and uses a
|
|
phase locked loop ('PLL') to decode a bit stream from the surface of the disk.
|
|
|
|
Partly abstract; it is expected that subclasses will provide methods to deal with receiving a newly-recognised
|
|
bit from the PLL and with crossing the index hole.
|
|
|
|
TODO: communication of head size and permissible stepping extents, appropriate simulation of gain.
|
|
*/
|
|
class Controller: public DigitalPhaseLockedLoop::Delegate, public TimedEventLoop {
|
|
protected:
|
|
/*!
|
|
Constructs a @c DiskDrive that will be run at @c clock_rate and runs its PLL at @c clock_rate*clock_rate_multiplier,
|
|
spinning inserted disks at @c revolutions_per_minute.
|
|
*/
|
|
Controller(unsigned int clock_rate, unsigned int clock_rate_multiplier, unsigned int revolutions_per_minute);
|
|
|
|
/*!
|
|
Communicates to the PLL the expected length of a bit as a fraction of a second.
|
|
*/
|
|
void set_expected_bit_length(Time bit_length);
|
|
|
|
/*!
|
|
Advances the drive by @c number_of_cycles cycles.
|
|
*/
|
|
void run_for_cycles(int number_of_cycles);
|
|
|
|
/*!
|
|
Sets the current drive.
|
|
*/
|
|
void set_drive(std::shared_ptr<Drive> drive);
|
|
void invalidate_track();
|
|
|
|
/*!
|
|
Enables or disables the disk motor.
|
|
*/
|
|
void set_motor_on(bool motor_on);
|
|
|
|
/*!
|
|
Should be implemented by subclasses; communicates each bit that the PLL recognises, also specifying
|
|
the amount of time since the index hole was last seen.
|
|
*/
|
|
virtual void process_input_bit(int value, unsigned int cycles_since_index_hole) = 0;
|
|
|
|
/*!
|
|
Should be implemented by subcalsses; communicates that the index hole has been reached.
|
|
*/
|
|
virtual void process_index_hole() = 0;
|
|
|
|
// for TimedEventLoop
|
|
virtual void process_next_event();
|
|
|
|
// to satisfy DigitalPhaseLockedLoop::Delegate
|
|
void digital_phase_locked_loop_output_bit(int value);
|
|
|
|
bool get_is_track_zero();
|
|
void step(int direction);
|
|
|
|
private:
|
|
Time _bit_length;
|
|
unsigned int _clock_rate;
|
|
unsigned int _clock_rate_multiplier;
|
|
Time _rotational_multiplier;
|
|
|
|
std::shared_ptr<DigitalPhaseLockedLoop> _pll;
|
|
std::shared_ptr<Drive> _drive;
|
|
std::shared_ptr<Track> _track;
|
|
unsigned int _cycles_since_index_hole;
|
|
|
|
inline void get_next_event();
|
|
Track::Event _current_event;
|
|
Time _time_into_track;
|
|
bool _motor_is_on;
|
|
|
|
void setup_track();
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* DiskDrive_hpp */
|