public void SetByteAt(uint address, byte value)
{
if ((address & 0xfffc) == 0x0800)
{
return;
} // mirrored register
else if ((address &= AddressMask) >= this.Storage.Length)
{
return;
}
this.Log("Set register byte at address " + address.ToString("x3") + " " + value.ToString("x"));
IORegister reg = this.Storage[address];
bool offset = (address & 1) > 0;
if (!offset)
{
reg.Set(value, true, false);
}
else
{
reg.Set((ushort)(value << 8), false, true);
}
}
public uint?GetWordAt(uint address)
{
if ((address & 0xfffc) == 0x0800)
{
return(null);
} // mirrored register
else if ((address &= AddressMask) >= this.Storage.Length)
{
return(null);
}
address &= 0x00ff_fffc; // force align
this.Log("Get register word at address " + address.ToString("x"));
IORegister reg = this.Storage[address];
// force alignment makes these accesses a lot simpler!
return((uint)(reg.Get() | (this.Storage[address + 2].Get() << 16)));
}
public void SetHalfWordAt(uint address, ushort value)
{
if ((address & 0xfffc) == 0x0800)
{
return;
} // mirrored register
else if ((address &= AddressMask) >= this.Storage.Length)
{
return;
}
address &= 0x00ff_fffe; // force align
this.Log("Set register halfword at address " + address.ToString("x3") + " " + value.ToString("x"));
IORegister reg = this.Storage[address];
// force alignment makes these accesses a lot simpler!
reg.Set(value, true, true);
}
public byte?GetByteAt(uint address)
{
if ((address & 0xfffc) == 0x0800)
{
return(null);
} // mirrored register
else if ((address &= AddressMask) >= this.Storage.Length)
{
return(null);
}
this.Log("Get register byte at address " + address.ToString("x3"));
IORegister reg = this.Storage[address];
bool offset = (address & 1) > 0;
if (!offset)
{
return((byte)reg.Get());
}
else
{
return((byte)((reg.Get() & 0xff00) >> 8));
}
}
