/// <summary>
/// 指定したアドレスから4byte読み出します
/// </summary>
/// <param name="bus">読み出し対象</param>
/// <param name="addr">読み出し先</param>
/// <param name="isNondestructive">非破壊読み出しならtrue</param>
/// <returns></returns>
public static uint Read32(this IBusAccessible bus, uint addr, bool isNondestructive = false)
{
var dst = new byte[4];
bus.Read(addr, dst, isNondestructive);
return((uint)(dst[0] | (dst[1] << 8) | (dst[2] << 16) | (dst[3] << 24)));
}
/// <summary>
/// 指定したアドレスから2byte読み出します
/// </summary>
/// <param name="bus">読み出し対象</param>
/// <param name="addr">読み出し先</param>
/// <param name="isNondestructive">非破壊読み出しならtrue</param>
/// <returns></returns>
public static ushort Read16(this IBusAccessible bus, uint addr, bool isNondestructive = false)
{
var dst = new byte[2];
bus.Read(addr, dst, isNondestructive);
return((ushort)(dst[0] | (dst[1] << 8)));
}
/// <summary>
/// 指定したアドレスから1byte読み出します
/// </summary>
/// <param name="bus">読み出し対象</param>
/// <param name="addr">読み出し先</param>
/// <param name="isNondestructive">非破壊読み出しならtrue</param>
/// <returns></returns>
public static byte Read8(this IBusAccessible bus, uint addr, bool isNondestructive = false)
{
var dst = new byte[1];
bus.Read(addr, dst, isNondestructive);
return(dst[0]);
}
/// <summary>
/// 指定したアドレスに1byte書き込みます
/// </summary>
/// <param name="bus">書き込み対象</param>
/// <param name="addr">書き込み先</param>
/// <param name="data">書き込みデータ</param>
/// <returns></returns>
public static bool Write8(this IBusAccessible bus, uint addr, byte data)
{
var src = new byte[] {
data,
};
return(bus.Write(addr, src));
}
public Mmu(IBusAccessible wram, IBusAccessible ppu, IBusAccessible apu, IBusAccessible onchip, IBusAccessible dma, IBusAccessible cartridge)
{
this.Wram = wram;
this.PpuControlReg = ppu;
this.ApuControlReg = apu;
this.OnChipIoPort = onchip;
this.DmaControlReg = dma;
this.Cartridge = cartridge;
}
/// <summary>
/// 指定したアドレスに2byte書き込みます
/// </summary>
/// <param name="bus">書き込み対象</param>
/// <param name="addr">書き込み先</param>
/// <param name="data">書き込みデータ</param>
/// <returns></returns>
public static bool Write16(this IBusAccessible bus, uint addr, ushort data)
{
var src = new byte[] {
(byte)(data & 0xff),
(byte)((data >> 8) & 0xff),
};
return(bus.Write(addr, src));
}
