mirror of
https://github.com/MoleskiCoder/EightBit.git
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104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
#pragma once
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#include <cstdint>
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#include <vector>
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#include <string>
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#include <Ram.h>
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#include <Rom.h>
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#include <Bus.h>
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#include <Register.h>
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#include <UnusedMemory.h>
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#include "LR35902.h"
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#include "IoRegisters.h"
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namespace EightBit {
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namespace GameBoy {
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class Bus : public EightBit::Bus {
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public:
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enum CartridgeType {
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ROM = 0,
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ROM_MBC1 = 1,
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ROM_MBC1_RAM = 2,
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ROM_MBC1_RAM_BATTERY = 3,
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};
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enum {
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CyclesPerSecond = 4 * 1024 * 1024,
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FramesPerSecond = 60,
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CyclesPerFrame = CyclesPerSecond / FramesPerSecond,
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TotalLineCount = 154,
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CyclesPerLine = CyclesPerFrame / TotalLineCount,
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RomPageSize = 0x4000
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};
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Bus() noexcept;
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virtual void raisePOWER() override;
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virtual void lowerPOWER() override;
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[[nodiscard]] auto& CPU() noexcept { return m_cpu; }
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[[nodiscard]] auto& VRAM() noexcept { return m_videoRam; }
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[[nodiscard]] auto& OAMRAM() noexcept { return m_oamRam; }
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[[nodiscard]] auto& IO() noexcept { return m_ioPorts; }
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void reset();
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void disableGameRom() noexcept { m_disableGameRom = true; }
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void enableGameRom() noexcept { m_disableGameRom = false; }
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[[nodiscard]] bool gameRomDisabled() const noexcept { return m_disableGameRom; }
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[[nodiscard]] bool gameRomEnabled() const noexcept { return !gameRomDisabled(); }
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void loadBootRom(std::string path);
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void loadGameRom(std::string path);
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void runRasterLines();
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void runVerticalBlankLines();
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protected:
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virtual MemoryMapping mapping(uint16_t address) noexcept override;
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private:
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LR35902 m_cpu;
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Rom m_bootRom = 0x100; // 0x0000 - 0x00ff
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std::vector<Rom> m_gameRomBanks; // 0x0000 - 0x3fff, 0x4000 - 0x7fff (switchable)
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Ram m_videoRam = 0x2000; // 0x8000 - 0x9fff
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std::vector<Ram> m_ramBanks; // 0xa000 - 0xbfff (switchable)
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UnusedMemory m_unmapped2000 = { 0x2000, 0xff }; // 0xa000 - 0xbfff
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Ram m_lowInternalRam = 0x2000; // 0xc000 - 0xdfff (mirrored at 0xe000)
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Ram m_oamRam = 0xa0; // 0xfe00 - 0xfe9f
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UnusedMemory m_unmapped60 = { 0x60, 0xff }; // 0xfea0 - 0xfeff
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IoRegisters m_ioPorts; // 0xff00 - 0xff7f
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Ram m_highInternalRam = 0x80; // 0xff80 - 0xffff
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bool m_enabledLCD = false;
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bool m_disableGameRom = false;
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bool m_rom = false;
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bool m_banked = false;
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bool m_ram = false;
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bool m_battery = false;
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bool m_higherRomBank = true;
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bool m_ramBankSwitching = false;
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int m_romBank = 1;
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int m_ramBank = 0;
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int m_allowed = 0;
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void validateCartridgeType();
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void Bus_WrittenByte(EightBit::EventArgs) noexcept;
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void runRasterLines(int lines);
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void runVerticalBlankLines(int lines);
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void runRasterLine(int suggested);
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};
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}
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} |