57 lines
No EOL
1.2 KiB
C++
57 lines
No EOL
1.2 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "CpuTypes.h"
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class MemoryManager;
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struct DmaChannelConfig
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{
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bool InvertDirection;
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bool Decrement;
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bool FixedTransfer;
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bool HdmaIndirectAddressing;
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uint8_t TransferMode;
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uint16_t SrcAddress;
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uint8_t SrcBank;
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uint8_t DestAddress;
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uint16_t TransferSize;
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uint8_t HdmaBank;
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uint16_t HdmaTableAddress;
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uint8_t HdmaLineCounterAndRepeat;
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bool DoTransfer;
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bool HdmaFinished;
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bool UnusedFlag;
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};
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class DmaController
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{
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private:
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static constexpr uint8_t _transferByteCount[8] = { 1, 2, 2, 4, 4, 4, 2, 4 };
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static constexpr uint8_t _transferOffset[8][4] = {
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{ 0, 0, 0, 0 }, { 0, 1, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 1, 1 },
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{ 0, 1, 2, 3 }, { 0, 1, 0, 1 }, { 0, 0, 0, 0 }, { 0, 0, 1, 1 }
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};
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bool _hdmaPending = false;
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uint8_t _hdmaChannels = 0;
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DmaChannelConfig _channel[8] = {};
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MemoryManager *_memoryManager;
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void RunSingleTransfer(DmaChannelConfig &channel);
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void RunDma(DmaChannelConfig &channel);
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void RunHdmaTransfer(DmaChannelConfig &channel);
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public:
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DmaController(MemoryManager *memoryManager);
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void InitHdmaChannels();
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void ProcessHdmaChannels();
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void Write(uint16_t addr, uint8_t value);
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uint8_t Read(uint16_t addr);
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}; |