84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
#pragma once
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#include "common/bitfield.h"
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#include "types.h"
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#include <array>
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class StateWrapper;
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class System;
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class InterruptController;
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class Timers
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{
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public:
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Timers();
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~Timers();
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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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void SetGate(u32 timer, bool state);
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void DrawDebugStateWindow();
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// dot clock/hblank/sysclk div 8
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bool IsUsingExternalClock(u32 timer) const { return m_states[timer].external_counting_enabled; }
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void AddTicks(u32 timer, TickCount ticks);
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void Execute(TickCount sysclk_ticks);
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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_TIMERS = 3;
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enum class SyncMode : u8
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{
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PauseOnGate = 0,
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ResetOnGate = 1,
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ResetAndRunOnGate = 2,
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FreeRunOnGate = 3
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};
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union CounterMode
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{
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u32 bits;
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BitField<u32, bool, 0, 1> sync_enable;
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BitField<u32, SyncMode, 1, 2> sync_mode;
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BitField<u32, bool, 3, 1> reset_at_target;
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BitField<u32, bool, 4, 1> irq_at_target;
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BitField<u32, bool, 5, 1> irq_on_overflow;
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BitField<u32, bool, 6, 1> irq_repeat;
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BitField<u32, bool, 7, 1> irq_pulse_n;
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BitField<u32, u8, 8, 2> clock_source;
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BitField<u32, bool, 10, 1> interrupt_request_n;
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BitField<u32, bool, 11, 1> reached_target;
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BitField<u32, bool, 12, 1> reached_overflow;
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};
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struct CounterState
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{
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CounterMode mode;
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u32 counter;
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u32 target;
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bool gate;
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bool use_external_clock;
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bool external_counting_enabled;
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bool counting_enabled;
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bool irq_done;
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};
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void UpdateCountingEnabled(CounterState& cs);
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void UpdateIRQ(u32 index);
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void UpdateDowncount();
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System* m_system = nullptr;
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InterruptController* m_interrupt_controller = nullptr;
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std::array<CounterState, NUM_TIMERS> m_states{};
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u32 m_sysclk_div_8_carry = 0; // partial ticks for timer 3 with sysclk/8
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};
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