107 lines
1.9 KiB
C++
107 lines
1.9 KiB
C++
#pragma once
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#include <vector>
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#include "Types.hpp"
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#include "CPU.hpp"
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#include "PPU.hpp"
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#include "APU.hpp"
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#include "Cartridge.hpp"
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#include "ControllerPort.hpp"
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/**
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* @brief The main bus for hardware to communicate.
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*
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* This is not a realistic representation of the NES's bus, as the
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* CPU and PPU don't share a bus in the real world. However this
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* bus class still doesn't give the CPU/PPU direct access to the other
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* components address space.
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*/
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class Bus
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{
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friend class Debugger;
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friend class MemoryViewer;
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friend class NametableViewer;
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friend class Palettes;
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public:
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Bus(const char* rom, Screen* screen);
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/**
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* @brief Reboot the NES.
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*
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* This equates to turning the NES off and on again.
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* Internal state will be equal to the powerup state
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*/
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void Reboot();
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/**
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* @brief Resets the NES.
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*
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* Internal state will be equal to the reset state
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*/
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void Reset();
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/**
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* @brief Advance the emulator by one CPU cycle (and 3 PPU cycles).
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*/
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uint8_t Tick();
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void DMATick();
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void PPUTick();
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/**
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* @brief Advance the emulator by one CPU instruction.
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*/
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bool Instruction();
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/**
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* @brief Advance the emulator by one Frame.
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* The emulator runs until the PPU triggers VBlankStart
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*/
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bool Frame();
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/**
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* @brief Read call from the CPU
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*/
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Byte ReadCPU(Word addr);
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/**
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* @brief Read call from the PPU
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*/
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Byte ReadPPU(Word addr);
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/**
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* @brief Write call from the CPU
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*/
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void WriteCPU(Word addr, Byte val);
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/**
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* @brief Write call from the PPU
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*/
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void WritePPU(Word addr, Byte val);
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/**
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* @brief Lets the PPU trigger NMIs.
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*/
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inline void NMI() { cpu.NMI(); }
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inline void IRQ() { cpu.IRQ(); }
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private:
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std::vector<Byte> RAM, VRAM;
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std::vector<Byte> palettes;
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CPU cpu;
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PPU ppu;
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APU apu;
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Cartridge cartridge;
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ControllerPort controllerPort;
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Byte preDMACycles = 0;
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Word DMACyclesLeft = 0;
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Byte DMAPage = 0;
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Byte DMALatch = 0;
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uint8_t ppuClock = 0;
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};
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