Duckstation/src/core/pad.h

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#pragma once
#include "common/bitfield.h"
#include "common/fifo_queue.h"
#include "types.h"
#include <array>
#include <memory>
class StateWrapper;
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class System;
class TimingEvent;
class InterruptController;
class Controller;
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class MemoryCard;
class Pad
{
public:
Pad();
~Pad();
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void Initialize(System* system, InterruptController* interrupt_controller);
void Reset();
bool DoState(StateWrapper& sw);
Controller* GetController(u32 slot) const { return m_controllers[slot].get(); }
void SetController(u32 slot, std::unique_ptr<Controller> dev);
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MemoryCard* GetMemoryCard(u32 slot) { return m_memory_cards[slot].get(); }
void SetMemoryCard(u32 slot, std::unique_ptr<MemoryCard> dev);
u32 ReadRegister(u32 offset);
void WriteRegister(u32 offset, u32 value);
private:
static constexpr u32 NUM_SLOTS = 2;
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enum class State : u32
{
Idle,
Transmitting,
WaitingForACK
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};
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enum class ActiveDevice : u8
{
None,
Controller,
MemoryCard
};
union JOY_CTRL
{
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u16 bits;
BitField<u16, bool, 0, 1> TXEN;
BitField<u16, bool, 1, 1> SELECT;
BitField<u16, bool, 2, 1> RXEN;
BitField<u16, bool, 4, 1> ACK;
BitField<u16, bool, 6, 1> RESET;
BitField<u16, u8, 8, 2> RXIMODE;
BitField<u16, bool, 10, 1> TXINTEN;
BitField<u16, bool, 11, 1> RXINTEN;
BitField<u16, bool, 12, 1> ACKINTEN;
BitField<u16, u8, 13, 1> SLOT;
};
union JOY_STAT
{
u32 bits;
BitField<u32, bool, 0, 1> TXRDY;
BitField<u32, bool, 1, 1> RXFIFONEMPTY;
BitField<u32, bool, 2, 1> TXDONE;
BitField<u32, bool, 7, 1> ACKINPUT;
BitField<u32, bool, 9, 1> INTR;
BitField<u32, u32, 11, 21> TMR;
};
union JOY_MODE
{
u16 bits;
BitField<u16, u8, 0, 2> reload_factor;
BitField<u16, u8, 2, 2> character_length;
BitField<u16, bool, 4, 1> parity_enable;
BitField<u16, u8, 5, 1> parity_type;
BitField<u16, u8, 8, 1> clk_polarity;
};
bool IsTransmitting() const { return m_state != State::Idle; }
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); }
TickCount GetACKTicks() const { return 32; }
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void SoftReset();
void UpdateJoyStat();
void TransferEvent(TickCount ticks_late);
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void BeginTransfer();
void DoTransfer(TickCount ticks_late);
void DoACK();
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void EndTransfer();
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void ResetDeviceTransferState();
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System* m_system = nullptr;
InterruptController* m_interrupt_controller = nullptr;
std::array<std::unique_ptr<Controller>, NUM_SLOTS> m_controllers;
std::array<std::unique_ptr<MemoryCard>, NUM_SLOTS> m_memory_cards;
std::unique_ptr<TimingEvent> m_transfer_event;
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State m_state = State::Idle;
JOY_CTRL m_JOY_CTRL = {};
JOY_STAT m_JOY_STAT = {};
JOY_MODE m_JOY_MODE = {};
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u16 m_JOY_BAUD = 0;
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ActiveDevice m_active_device = ActiveDevice::None;
u8 m_receive_buffer = 0;
u8 m_transmit_buffer = 0;
u8 m_transmit_value = 0;
bool m_receive_buffer_full = false;
bool m_transmit_buffer_full = false;
};