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namespace Q1Emu.Chip;
using System;
using System.Collections.Generic;
public partial class Q1Cpu
{
public u16 FetchData(u8 mode)
{
return mode switch
{
0x0 => this.AddressingMode_Implicit(),
0x1 => this.AddressingMode_Immediate(),
0x2 => this.AddressingMode_Direct(),
0x3 => this.AddressingMode_Indirect(),
0x4 => this.AddressingMode_Relative(),
0x5 => this.AddressingMode_Register(),
0x6 => this.AddressingMode_RegisterIndirect(),
0x7 => this.AddressingMode_RegisterIndirectOffset(),
_ => throw new InvalidOperationException($"Unknown addressing mode: {mode:X2}"),
};
}
public void StoreData(u8 mode, u16 value)
{
switch (mode)
{
case 0x0:
throw new InvalidOperationException("Cannot store data in implicit mode.");
case 0x1:
throw new InvalidOperationException("Cannot store data in immediate mode.");
case 0x2:
this.AddressingMode_Direct_Store(value);
break;
case 0x3:
this.AddressingMode_Indirect_Store(value);
break;
case 0x4:
this.AddressingMode_Relative_Store(value);
break;
case 0x5:
this.AddressingMode_Register_Store(value);
break;
case 0x6:
this.AddressingMode_RegisterIndirect_Store(value);
break;
case 0x7:
this.AddressingMode_RegisterIndirectOffset_Store(value);
break;
default:
throw new InvalidOperationException($"Unknown addressing mode: {mode:X2}");
}
}
public void TransformData(u8 mode, Func<u16, u16> transform)
{
// if (mode != 0x05)
// {
// u16 address = this.FetchData(mode);
// u16 value = this.Bus.ReadWord(address);
// u16 transformedValue = transform(value);
// this.Bus.WriteWord(address, transformedValue);
// }
// else
// {
// u8 regIndex = this.Bus.Read(this.PC);
// this.PC += 1;
//
// u16 value = this.FetchRegister(regIndex);
// u16 transformedValue = transform(value);
// this.StoreRegister(regIndex, transformedValue);
// }
throw new NotImplementedException("TransformData is not implemented yet.");
}
public u8 AddressingModeLength(u8 mode)
{
return mode switch
{
0x0 => 0, // Implicit
0x1 => 2, // Immediate
0x2 => 2, // Direct
0x3 => 2, // Indirect
0x4 => 2, // Relative
0x5 => 1, // Register
0x6 => 1, // Register indirect
0x7 => 3, // Register indirect with offset
_ => throw new InvalidOperationException($"Unknown addressing mode: {mode:X2}"),
};
}
public u16 AddressingMode_Implicit()
{
return 0;
}
public u16 AddressingMode_Immediate()
{
u16 value = this.Bus.ReadWord(this.PC);
this.PC += 2;
return value;
}
public u16 AddressingMode_Direct()
{
u16 address = this.Bus.ReadWord(this.PC);
this.PC += 2;
u16 value = this.Bus.ReadWord(address);
return value;
}
public u16 AddressingMode_Indirect()
{
u16 address = this.Bus.ReadWord(this.PC);
this.PC += 2;
u16 indirectAddress = this.Bus.ReadWord(address);
u16 value = this.Bus.ReadWord(indirectAddress);
return value;
}
public u16 AddressingMode_Relative()
{
u16 offset = this.Bus.ReadWord(this.PC);
this.PC += 2;
u16 address = (u16) (this.PC + offset);
return address;
}
public u16 AddressingMode_Register()
{
u8 regIndex = this.Bus.Read(this.PC);
this.PC += 1;
return this.FetchRegister(regIndex);
}
public u16 AddressingMode_RegisterIndirect()
{
u8 regIndex = this.Bus.Read(this.PC);
this.PC += 1;
u16 address = this.FetchRegister(regIndex);
u16 value = this.Bus.ReadWord(address);
Console.WriteLine($"Value at {address:X4}: {value:X4}");
return value;
}
public u16 AddressingMode_RegisterIndirectOffset()
{
u8 regIndex = this.Bus.Read(this.PC);
this.PC += 1;
i16 offset = Make.i16(this.Bus.ReadSeq(this.PC, 2));
Console.WriteLine("Offset: " + offset);
this.PC += 2;
u16 address = (u16) (this.FetchRegister(regIndex) + offset);
u16 value = this.Bus.ReadWord(address);
return value;
}
public void AddressingMode_Direct_Store(u16 data)
{
u16 address = this.Bus.ReadWord(this.PC);
this.PC += 2;
this.Bus.WriteWord(address, data);
}
public void AddressingMode_Indirect_Store(u16 data)
{
u16 address = this.Bus.ReadWord(this.PC);
this.PC += 2;
u16 indirectAddress = this.Bus.ReadWord(address);
this.Bus.WriteWord(indirectAddress, data);
}
public void AddressingMode_Relative_Store(u16 data)
{
u16 offset = this.Bus.ReadWord(this.PC);
this.PC += 2;
u16 address = (u16) (this.PC + offset);
this.Bus.WriteWord(address, data);
}
public void AddressingMode_Register_Store(u16 data)
{
u8 regIndex = this.Bus.Read(this.PC);
this.PC += 1;
this.StoreRegister(regIndex, data);
}
public void AddressingMode_RegisterIndirect_Store(u16 data)
{
u8 regIndex = this.Bus.Read(this.PC);
this.PC += 1;
u16 address = this.FetchRegister(regIndex);
this.Bus.WriteWord(address, data);
}
public void AddressingMode_RegisterIndirectOffset_Store(u16 data)
{
u8 regIndex = this.Bus.Read(this.PC);
this.PC += 1;
i16 offset = Make.i16(this.Bus.ReadSeq(this.PC, 2));
this.PC += 2;
u16 address = (u16) (this.FetchRegister(regIndex) + offset);
this.Bus.WriteWord(address, data);
}
}
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