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SourMesen
142884b598
The NES (and AV Famicom) both ignore consecutive reads to 4016/4017 (when the reads on 2 consecutive CPU cycles). This implements that behavior when the corresponding console type is selected. These changes also simplify the DMA code, because a lot of extra code was in the DMA logic to simulate the same result. Moving this logic to the 4016/4017 reads makes the code simpler and allows it to work properly when a regular instruction reads from 4016/4017 twice in a row, too.
62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/INesMemoryHandler.h"
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#include "Shared/BaseControlManager.h"
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#include "Shared/SettingTypes.h"
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#include "Utilities/SimpleLock.h"
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#include "Utilities/ISerializable.h"
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class BaseControlDevice;
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class SystemActionManager;
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class IInputRecorder;
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class IInputProvider;
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class Emulator;
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class NesConsole;
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enum class ControllerType;
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class NesControlManager : public INesMemoryHandler, public BaseControlManager
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{
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private:
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NesConfig _prevConfig = {};
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uint16_t _writeAddr = 0;
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uint8_t _writeValue = 0;
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uint8_t _writePending = 0;
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uint16_t _prevReadAddr = 0;
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uint8_t ReadDevice(shared_ptr<BaseControlDevice>& device, uint16_t addr);
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protected:
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NesConsole* _console;
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virtual void Serialize(Serializer& s) override;
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virtual void RemapControllerButtons();
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public:
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NesControlManager(NesConsole* console);
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virtual ~NesControlManager();
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virtual uint8_t GetOpenBusMask(uint8_t port);
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void UpdateControlDevices() override;
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void UpdateInputState() override;
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void Reset(bool softReset) override;
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bool IsKeyboardConnected() override;
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shared_ptr<BaseControlDevice> CreateControllerDevice(ControllerType type, uint8_t port) override;
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void GetMemoryRanges(MemoryRanges& ranges) override
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{
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ranges.AddHandler(MemoryOperation::Read, 0x4016, 0x4017);
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ranges.AddHandler(MemoryOperation::Write, 0x4016);
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}
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uint8_t ReadRam(uint16_t addr) override;
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void WriteRam(uint16_t addr, uint8_t value) override;
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__noinline void ProcessWrites();
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__forceinline bool HasPendingWrites() { return _writePending > 0; }
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};
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