mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-25 01:32:55 +00:00
112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
//
|
|
// DMAController.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 26/10/2019.
|
|
// Copyright © 2019 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include <cstdint>
|
|
#include <vector>
|
|
|
|
#include "../../../ClockReceiver/ClockReceiver.hpp"
|
|
#include "../../../ClockReceiver/ClockingHintSource.hpp"
|
|
#include "../../../Components/1770/1770.hpp"
|
|
#include "../../../Activity/Source.hpp"
|
|
|
|
namespace Atari::ST {
|
|
|
|
class DMAController: public WD::WD1770::Delegate, public ClockingHint::Source, public ClockingHint::Observer {
|
|
public:
|
|
DMAController();
|
|
|
|
uint16_t read(int address);
|
|
void write(int address, uint16_t value);
|
|
void run_for(HalfCycles duration);
|
|
|
|
bool get_interrupt_line();
|
|
bool get_bus_request_line();
|
|
|
|
/*!
|
|
Indicates that the DMA controller has been granted bus access to the block of memory at @c ram, which
|
|
is of size @c size.
|
|
|
|
@returns The number of words read or written.
|
|
*/
|
|
int bus_grant(uint16_t *ram, size_t size);
|
|
|
|
void set_floppy_drive_selection(bool drive1, bool drive2, bool side2);
|
|
void set_floppy_disk(std::shared_ptr<Storage::Disk::Disk> disk, size_t drive);
|
|
|
|
struct Delegate {
|
|
virtual void dma_controller_did_change_output(DMAController *) = 0;
|
|
};
|
|
void set_delegate(Delegate *delegate);
|
|
|
|
void set_activity_observer(Activity::Observer *observer);
|
|
|
|
// ClockingHint::Source.
|
|
ClockingHint::Preference preferred_clocking() const final;
|
|
|
|
private:
|
|
HalfCycles running_time_;
|
|
struct WD1772: public WD::WD1770 {
|
|
WD1772(): WD::WD1770(WD::WD1770::P1772) {
|
|
emplace_drives(2, 8000000, 300, 2);
|
|
set_is_double_density(true); // TODO: is this selectable on the ST?
|
|
}
|
|
|
|
void set_motor_on(bool motor_on) final {
|
|
for_all_drives([motor_on] (Storage::Disk::Drive &drive, size_t) {
|
|
drive.set_motor_on(motor_on);
|
|
});
|
|
}
|
|
|
|
void set_floppy_drive_selection(bool drive1, bool drive2, bool side2) {
|
|
set_drive(
|
|
(drive1 ? 1 : 0) |
|
|
(drive2 ? 2 : 0)
|
|
);
|
|
|
|
for_all_drives([side2] (Storage::Disk::Drive &drive, size_t) {
|
|
drive.set_head(side2);
|
|
});
|
|
}
|
|
|
|
void set_activity_observer(Activity::Observer *observer) {
|
|
get_drive(0).set_activity_observer(observer, "Internal", true);
|
|
get_drive(1).set_activity_observer(observer, "External", true);
|
|
}
|
|
|
|
void set_disk(std::shared_ptr<Storage::Disk::Disk> disk, size_t drive) {
|
|
get_drive(drive).set_disk(disk);
|
|
}
|
|
|
|
} fdc_;
|
|
|
|
void wd1770_did_change_output(WD::WD1770 *) final;
|
|
|
|
uint16_t control_ = 0;
|
|
|
|
Delegate *delegate_ = nullptr;
|
|
bool interrupt_line_ = false;
|
|
bool bus_request_line_ = false;
|
|
|
|
void set_component_prefers_clocking(ClockingHint::Source *, ClockingHint::Preference) final;
|
|
|
|
// MARK: - DMA State.
|
|
struct Buffer {
|
|
uint8_t contents[16];
|
|
bool is_full = false;
|
|
} buffer_[2];
|
|
int active_buffer_ = 0;
|
|
int bytes_received_ = 0;
|
|
bool error_ = false;
|
|
int address_ = 0;
|
|
int byte_count_ = 0;
|
|
};
|
|
|
|
}
|