102 lines
3.2 KiB
C#
102 lines
3.2 KiB
C#
using Core.Cpu;
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using Core.Io;
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using Core.Memory;
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using Core.Video;
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using Core.Audio;
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using System;
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using System.IO;
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using System.Collections.Generic;
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namespace Core
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{
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public class SmsMachine
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{
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public Z80 Cpu { get; private set; }
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public SmsMemoryBus MemoryBus { get; private set; }
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public SmsIoBus IoBus { get; private set; }
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public SmsVdp VideoProcessor { get; private set; }
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public SmsApu AudioProcessor { get; private set; }
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public ushort? Breakpoint { get; set; } = null;
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// NTSC SMS T-States per frame
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public const int TStatesPerFrame = 59736; //NTSC
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//public const int TStatesPerFrame = 49780; //PAL
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public SmsMachine()
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{
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MemoryBus = new SmsMemoryBus();
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VideoProcessor = new SmsVdp();
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AudioProcessor = new SmsApu();
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IoBus = new SmsIoBus { VideoProcessor = this.VideoProcessor, AudioProcessor = this.AudioProcessor };
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Cpu = new Z80(MemoryBus, IoBus);
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}
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public void LoadCartridge(byte[] romData)
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{
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MemoryBus.LoadCartridge(romData);
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Reset();
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}
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public void Reset()
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{
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MemoryBus.CleanRAMData();
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Cpu.Reset();
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}
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public void RunFrame()
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{
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int tStatesThisFrame = 0;
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while (tStatesThisFrame < TStatesPerFrame) // Standard NTSC frame time
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{
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// 1. Run one CPU instruction
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int cycles = Cpu.Step();
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tStatesThisFrame += cycles;
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// 2. Tell the VDP to catch up
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VideoProcessor.Update(cycles);
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AudioProcessor.Update(cycles);
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// 3. Check if the VDP is begging for attention!
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if (VideoProcessor.InterruptPending && Cpu.IFF1)
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{
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int intCycles = Cpu.RequestInterrupt();
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tStatesThisFrame += intCycles;
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VideoProcessor.Update(intCycles);
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AudioProcessor.Update(intCycles);
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}
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// 4. THE RESTORED BREAKPOINT TRAP
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if (Breakpoint.HasValue && Cpu.PC == Breakpoint.Value)
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{
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break; // Instantly abort the frame so the debugger can take over!
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}
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}
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}
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public void SaveState(string filePath)
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{
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using (var fs = new System.IO.FileStream(filePath, System.IO.FileMode.Create))
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using (var bw = new System.IO.BinaryWriter(fs))
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{
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Cpu.SaveState(bw);
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MemoryBus.SaveState(bw);
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VideoProcessor.SaveState(bw);
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AudioProcessor.SaveState(bw);
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}
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}
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public void LoadState(string filePath)
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{
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if (!System.IO.File.Exists(filePath)) return;
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using (var fs = new System.IO.FileStream(filePath, System.IO.FileMode.Open))
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using (var br = new System.IO.BinaryReader(fs))
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{
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Cpu.LoadState(br);
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MemoryBus.LoadState(br);
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VideoProcessor.LoadState(br);
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AudioProcessor.LoadState(br);
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}
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}
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}
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} |