Duckstation/src/core/pad.h
2021-03-01 14:59:59 -08:00

136 lines
3.4 KiB
C++

#pragma once
#include "common/bitfield.h"
#include "common/fifo_queue.h"
#include "multitap.h"
#include "types.h"
#include <array>
#include <memory>
class StateWrapper;
class TimingEvent;
class Controller;
class MemoryCard;
class Pad final
{
public:
Pad();
~Pad();
void Initialize();
void Shutdown();
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);
MemoryCard* GetMemoryCard(u32 slot) { return m_memory_cards[slot].get(); }
void SetMemoryCard(u32 slot, std::unique_ptr<MemoryCard> dev);
Multitap* GetMultitap(u32 slot) { return &m_multitaps[slot]; };
u32 ReadRegister(u32 offset);
void WriteRegister(u32 offset, u32 value);
ALWAYS_INLINE bool IsTransmitting() const { return m_state != State::Idle; }
private:
static constexpr u32 NUM_SLOTS = 2;
enum class State : u32
{
Idle,
Transmitting,
WaitingForACK
};
enum class ActiveDevice : u8
{
None,
Controller,
MemoryCard,
Multitap
};
union JOY_CTRL
{
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;
};
ALWAYS_INLINE bool CanTransfer() const { return m_transmit_buffer_full && m_JOY_CTRL.SELECT && m_JOY_CTRL.TXEN; }
ALWAYS_INLINE TickCount GetTransferTicks() const { return static_cast<TickCount>(ZeroExtend32(m_JOY_BAUD) * 8); }
// From @JaCzekanski
// ACK lasts ~96 ticks or approximately 2.84us at master clock (not implemented).
// ACK delay is between 6.8us-13.7us, or ~338 ticks at master clock for approximately 9.98us.
// Memory card responds faster, approximately 5us or ~170 ticks.
static constexpr TickCount GetACKTicks(bool memory_card) { return memory_card ? 170 : 450; }
void SoftReset();
void UpdateJoyStat();
void TransferEvent(TickCount ticks_late);
void BeginTransfer();
void DoTransfer(TickCount ticks_late);
void DoACK();
void EndTransfer();
void ResetDeviceTransferState();
std::array<std::unique_ptr<Controller>, NUM_CONTROLLER_AND_CARD_PORTS> m_controllers;
std::array<std::unique_ptr<MemoryCard>, NUM_CONTROLLER_AND_CARD_PORTS> m_memory_cards;
std::array<Multitap, NUM_MULTITAPS> m_multitaps;
std::unique_ptr<TimingEvent> m_transfer_event;
State m_state = State::Idle;
JOY_CTRL m_JOY_CTRL = {};
JOY_STAT m_JOY_STAT = {};
JOY_MODE m_JOY_MODE = {};
u16 m_JOY_BAUD = 0;
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;
};
extern Pad g_pad;