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108 lines
2.7 KiB
C++
108 lines
2.7 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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#ifndef DMAController_hpp
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#define DMAController_hpp
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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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namespace Atari {
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namespace 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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// ClockingHint::Source.
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ClockingHint::Preference preferred_clocking() 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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drives_.emplace_back(new Storage::Disk::Drive(8000000, 300, 2));
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drives_.emplace_back(new Storage::Disk::Drive(8000000, 300, 2));
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set_drive(drives_[0]);
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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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drives_[0]->set_motor_on(motor_on);
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drives_[1]->set_motor_on(motor_on);
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}
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void set_floppy_drive_selection(bool drive1, bool drive2, bool side2) {
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// TODO: handle no drives and/or both drives selected.
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if(drive1) {
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set_drive(drives_[0]);
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} else {
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set_drive(drives_[1]);
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}
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drives_[0]->set_head(side2);
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drives_[1]->set_head(side2);
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}
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std::vector<std::shared_ptr<Storage::Disk::Drive>> drives_;
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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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}
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#endif /* DMAController_hpp */
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