87 lines
1.5 KiB
C#
87 lines
1.5 KiB
C#
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using System.IO;
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namespace MyNes.Core
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{
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internal class MMC5Pcm
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{
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internal byte output;
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internal bool Outputable;
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private bool readMode;
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private bool PCMIRQenable;
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private bool irqTrip;
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internal void HardReset()
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{
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output = 0;
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readMode = false;
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PCMIRQenable = false;
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irqTrip = false;
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}
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internal void SoftReset()
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{
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HardReset();
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}
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internal void Write5010(byte data)
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{
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readMode = (data & 1) == 1;
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PCMIRQenable = (data & 0x80) == 128;
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if (PCMIRQenable && irqTrip)
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{
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NesEmu.IRQFlags |= 8;
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}
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}
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internal byte Read5010()
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{
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byte result = (byte)((irqTrip & PCMIRQenable) ? 128 : 0);
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irqTrip = false;
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NesEmu.IRQFlags &= -9;
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return result;
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}
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internal void Write5011(byte data)
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{
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if (readMode)
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{
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return;
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}
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if (data == 0)
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{
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irqTrip = true;
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}
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else
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{
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irqTrip = false;
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if (Outputable)
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{
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output = data;
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}
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}
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if (PCMIRQenable && irqTrip)
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{
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NesEmu.IRQFlags |= 8;
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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(readMode);
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stream.Write(PCMIRQenable);
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stream.Write(irqTrip);
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}
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internal void LoadState(ref BinaryReader stream)
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{
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readMode = stream.ReadBoolean();
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PCMIRQenable = stream.ReadBoolean();
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irqTrip = stream.ReadBoolean();
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}
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}
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}
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