mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2024-10-23 23:55:42 +00:00
132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
#pragma once
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#include "common/bitfield.h"
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#include "common/fifo_queue.h"
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#include "types.h"
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#include <array>
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#include <memory>
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class StateWrapper;
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class System;
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class TimingEvent;
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class InterruptController;
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class Controller;
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class MemoryCard;
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class Pad
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{
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public:
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Pad();
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~Pad();
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void Initialize(System* system, InterruptController* interrupt_controller);
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void Reset();
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bool DoState(StateWrapper& sw);
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Controller* GetController(u32 slot) const { return m_controllers[slot].get(); }
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void SetController(u32 slot, std::unique_ptr<Controller> dev);
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MemoryCard* GetMemoryCard(u32 slot) { return m_memory_cards[slot].get(); }
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void SetMemoryCard(u32 slot, std::unique_ptr<MemoryCard> dev);
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u32 ReadRegister(u32 offset);
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void WriteRegister(u32 offset, u32 value);
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private:
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static constexpr u32 NUM_SLOTS = 2;
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enum class State : u32
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{
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Idle,
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Transmitting,
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WaitingForACK
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};
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enum class ActiveDevice : u8
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{
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None,
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Controller,
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MemoryCard
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};
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union JOY_CTRL
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{
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u16 bits;
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BitField<u16, bool, 0, 1> TXEN;
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BitField<u16, bool, 1, 1> SELECT;
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BitField<u16, bool, 2, 1> RXEN;
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BitField<u16, bool, 4, 1> ACK;
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BitField<u16, bool, 6, 1> RESET;
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BitField<u16, u8, 8, 2> RXIMODE;
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BitField<u16, bool, 10, 1> TXINTEN;
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BitField<u16, bool, 11, 1> RXINTEN;
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BitField<u16, bool, 12, 1> ACKINTEN;
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BitField<u16, u8, 13, 1> SLOT;
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};
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union JOY_STAT
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{
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u32 bits;
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BitField<u32, bool, 0, 1> TXRDY;
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BitField<u32, bool, 1, 1> RXFIFONEMPTY;
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BitField<u32, bool, 2, 1> TXDONE;
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BitField<u32, bool, 7, 1> ACKINPUT;
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BitField<u32, bool, 9, 1> INTR;
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BitField<u32, u32, 11, 21> TMR;
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};
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union JOY_MODE
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{
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u16 bits;
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BitField<u16, u8, 0, 2> reload_factor;
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BitField<u16, u8, 2, 2> character_length;
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BitField<u16, bool, 4, 1> parity_enable;
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BitField<u16, u8, 5, 1> parity_type;
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BitField<u16, u8, 8, 1> clk_polarity;
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};
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bool IsTransmitting() const { return m_state != State::Idle; }
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bool CanTransfer() const { return m_transmit_buffer_full && m_JOY_CTRL.SELECT && m_JOY_CTRL.TXEN; }
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TickCount GetTransferTicks() const { return static_cast<TickCount>(ZeroExtend32(m_JOY_BAUD) * 8); }
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// From @JaCzekanski
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// ACK lasts ~96 ticks or approximately 2.84us at master clock (not implemented).
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// ACK delay is between 6.8us-13.7us, or ~338 ticks at master clock for approximately 9.98us.
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// Memory card responds faster, approximately 5us or ~170 ticks.
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static constexpr TickCount GetACKTicks(bool memory_card) { return memory_card ? 170 : 450; }
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void SoftReset();
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void UpdateJoyStat();
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void TransferEvent(TickCount ticks_late);
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void BeginTransfer();
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void DoTransfer(TickCount ticks_late);
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void DoACK();
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void EndTransfer();
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void ResetDeviceTransferState();
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System* m_system = nullptr;
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InterruptController* m_interrupt_controller = nullptr;
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std::array<std::unique_ptr<Controller>, NUM_SLOTS> m_controllers;
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std::array<std::unique_ptr<MemoryCard>, NUM_SLOTS> m_memory_cards;
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std::unique_ptr<TimingEvent> m_transfer_event;
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State m_state = State::Idle;
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JOY_CTRL m_JOY_CTRL = {};
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JOY_STAT m_JOY_STAT = {};
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JOY_MODE m_JOY_MODE = {};
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u16 m_JOY_BAUD = 0;
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ActiveDevice m_active_device = ActiveDevice::None;
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u8 m_receive_buffer = 0;
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u8 m_transmit_buffer = 0;
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u8 m_transmit_value = 0;
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bool m_receive_buffer_full = false;
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bool m_transmit_buffer_full = false;
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};
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