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