AxibugEmuOnline/AxibugEmuOnline.Client/Assets/MyNes.Core/Sunsoft5BChnl.cs
2024-07-03 18:22:22 +08:00

96 lines
1.8 KiB
C#

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