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NES - Mapper 50 - hook up IRQ logic?

This commit is contained in:
adelikat 2012-07-28 13:19:12 +00:00
parent 8d45516811
commit 678e60815e
1 changed files with 41 additions and 1 deletions
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42
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper50.cs
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@ -12,6 +12,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
byte prg_bank; byte prg_bank;
int prg_bank_mask_8k; int prg_bank_mask_8k;
bool irq_enable; bool irq_enable;
ushort irq_counter = 0;
bool irq_ready = false;
public override bool Configure(NES.EDetectionOrigin origin) public override bool Configure(NES.EDetectionOrigin origin)
{ {
//analyze board type //analyze board type
@ -31,6 +33,9 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public override void SyncState(Serializer ser) public override void SyncState(Serializer ser)
{ {
ser.Sync("prg_bank", ref prg_bank); ser.Sync("prg_bank", ref prg_bank);
ser.Sync("irq_enable", ref irq_enable);
ser.Sync("irq_counter", ref irq_counter);
ser.Sync("irq_ready", ref irq_ready);
base.SyncState(ser); base.SyncState(ser);
} }
@ -43,7 +48,12 @@ namespace BizHawk.Emulation.Consoles.Nintendo
} }
else if (addr == 0x0120) else if (addr == 0x0120)
{ {
SyncIRQ(value.Bit(0)); irq_enable = value.Bit(0);
if (!irq_enable)
{
SyncIRQ(irq_enable);
irq_counter = 0;
}
} }
} }
@ -72,5 +82,35 @@ namespace BizHawk.Emulation.Consoles.Nintendo
{ {
return ROM[(0x0F * 0x2000) + (addr & 0x1FFF)]; return ROM[(0x0F * 0x2000) + (addr & 0x1FFF)];
} }
private void IRQ_Ready()
{
base.SyncIRQ(irq_ready);
}
private void IRQ_Tick()
{
if (irq_enable)
{
if (irq_counter < 0x0FFF)
{
irq_counter += 1;
irq_ready = false;
}
else
{
irq_counter = 0;
irq_ready = true;
IRQ_Ready();
}
}
}
public override void ClockPPU()
{
IRQ_Tick();
base.ClockPPU();
}
} }
} }