public override void OnRead(IPlatformEngine engine, ulong address, uint size)
{
var ctx = engine.GetState <Ctx>(this);
switch (address & 0xFFF)
{
case 0: // status
engine.Write(address, BitConverter.GetBytes(ctx.Status));
if ((ctx.Status & 0x4) == 0x4) // is ready?
{
ctx.Data = ctx.WaitingData;
ctx.Status ^= 0x4;
}
break;
case 4: // cmd
engine.Write(address, new byte[4]);
break;
case 8: // address
engine.Write(address, BitConverter.GetBytes(ctx.Address));
break;
case 12: // data
engine.Write(address, BitConverter.GetBytes(ctx.Data));
break;
default:
throw new InvalidHwOperationException(engine, "Unknown register");
}
}
public override void OnWrite(IPlatformEngine engine, ulong address, uint size, ulong value)
{
var ctx = engine.GetState <Ctx>(this);
switch (address & 0xFFF)
{
case 0: // status
break;
case 4: // cmd
switch (value)
{
case 1: // OTP_CMD_INIT
if (_otpOriginalData.Length == 0 && File.Exists(_otpBinPath))
{
_otpOriginalData = File.ReadAllBytes(_otpBinPath);
}
else if (_otpOriginalData.Length == 0)
{
_otpOriginalData = new byte[4096];
}
ctx.OTPData = _otpOriginalData;
ctx.Status = 0x2; // ready
break;
case 2: // OTP_CMD_READ
if ((ctx.Status & 0x2) == 0x2 && (ctx.Status & 0x4) == 0x0) // is ready and not working?
{
if (ctx.Address + 4 < (ulong)ctx.OTPData.Length)
{
ctx.WaitingData = (uint)(ctx.OTPData[ctx.Address] + (ctx.OTPData[ctx.Address + 1] << 8) + (ctx.OTPData[ctx.Address + 2] << 16) + (ctx.OTPData[ctx.Address + 3] << 24));
ctx.Status |= 0x4; // working
}
else
{
ctx.Status |= 0x1; // error
}
}
break;
case 3: // OTP_CMD_WRITE
if ((ctx.Status & 0x2) == 0x2 && (ctx.Status & 0x4) == 0x0) // is ready and not working?
{
if (ctx.Address + 4 < (ulong)ctx.OTPData.Length)
{
ctx.OTPData[ctx.Address] = (byte)(ctx.OTPData[ctx.Address] | (byte)(ctx.Data & 0xFF));
ctx.OTPData[ctx.Address + 1] = (byte)(ctx.OTPData[ctx.Address + 1] | (byte)(ctx.Data >> 8 & 0xFF));
ctx.OTPData[ctx.Address + 2] = (byte)(ctx.OTPData[ctx.Address + 2] | (byte)(ctx.Data >> 16 & 0xFF));
ctx.OTPData[ctx.Address + 3] = (byte)(ctx.OTPData[ctx.Address + 3] | (byte)(ctx.Data >> 24 & 0xFF));
if (PersistentChanges)
{
_otpOriginalData = ctx.OTPData;
File.WriteAllBytes(_otpBinPath, ctx.OTPData);
}
ctx.WaitingData = (uint)value;
ctx.Status |= 0x4; // working
}
else
{
ctx.Status |= 0x1; // error
}
}
break;
default:
throw new InvalidHwOperationException(engine, $"Unknown OTP command {value}");
}
break;
case 8: // address
ctx.Address = (uint)value;
break;
case 12: // data
ctx.Data = (uint)value;
break;
default:
throw new InvalidHwOperationException(engine, "Unknown register");
}
}