96 lines
1.8 KiB
C#
96 lines
1.8 KiB
C#
using System.IO;
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namespace MyNes.Core
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{
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internal class Sunsoft5BChnl
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{
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internal bool Enabled;
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internal byte Volume;
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private int dutyStep;
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private int freqTimer;
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private int frequency;
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private int cycles;
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internal int output;
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internal bool Outputable;
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internal void HardReset()
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{
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}
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internal void SoftReset()
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{
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}
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internal void Write0(ref byte data)
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{
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frequency = (frequency & 0xF00) | data;
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freqTimer = (frequency + 1) * 2;
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}
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internal void Write1(ref byte data)
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{
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frequency = (frequency & 0xFF) | ((data & 0xF) << 8);
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freqTimer = (frequency + 1) * 2;
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}
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internal void ClockSingle()
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{
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if (--cycles > 0)
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{
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return;
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}
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cycles = freqTimer;
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dutyStep = (dutyStep + 1) & 0x1F;
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if (dutyStep <= 15)
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{
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if (Enabled)
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{
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if (Outputable)
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{
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output = Volume;
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}
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else
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{
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output = 0;
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}
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}
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else
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{
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output = 0;
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}
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}
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else
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{
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output = 0;
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}
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}
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internal void SaveState(ref BinaryWriter stream)
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{
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stream.Write(Enabled);
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stream.Write(Volume);
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stream.Write(dutyStep);
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stream.Write(freqTimer);
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stream.Write(frequency);
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stream.Write(cycles);
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}
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internal void LoadState(ref BinaryReader stream)
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{
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Enabled = stream.ReadBoolean();
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Volume = stream.ReadByte();
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dutyStep = stream.ReadInt32();
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freqTimer = stream.ReadInt32();
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frequency = stream.ReadInt32();
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cycles = stream.ReadInt32();
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}
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}
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}
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