int ReadUsbData(byte[] data, int index = 0)
{
ch.WriteCommand(RD_USB_DATA0);
var length = ch.ReadData();
var data2 = ch.ReadMultipleData(length);
if (data != null)
{
Array.Copy(data2, 0, data, index, length);
}
return(length);
}
private void Cpu_MemoryAccess(object sender, MemoryAccessEventArgs e)
{
if (e.Address == 0x20)
{
if (e.EventType == MemoryAccessEventType.BeforePortRead)
{
e.CancelMemoryAccess = true;
if (waitingMultiDataTransferLength)
{
waitingMultiDataTransferLength = false;
e.Value = chPorts.ReadData();
multiDataTransferRemaining = e.Value;
multiDataTransferPointer = 0;
if (e.Value > 0)
{
multiDataTransferBuffer = chPorts.ReadMultipleData(multiDataTransferRemaining);
}
}
else if (multiDataTransferRemaining > 0)
{
e.Value = multiDataTransferBuffer[multiDataTransferPointer];
multiDataTransferPointer++;
multiDataTransferRemaining--;
}
else
{
e.Value = chPorts.ReadData();
}
}
else if (e.EventType == MemoryAccessEventType.BeforePortWrite)
{
e.CancelMemoryAccess = true;
if (waitingMultiDataTransferLength)
{
waitingMultiDataTransferLength = false;
multiDataTransferBuffer = new byte[e.Value];
multiDataTransferPointer = 0;
multiDataTransferRemaining = e.Value;
chPorts.WriteData(e.Value);
}
else if (multiDataTransferRemaining > 0)
{
multiDataTransferBuffer[multiDataTransferPointer] = e.Value;
multiDataTransferPointer++;
multiDataTransferRemaining--;
if (multiDataTransferRemaining == 0)
{
chPorts.WriteMultipleData(multiDataTransferBuffer);
}
}
else
{
chPorts.WriteData(e.Value);
}
}
}
else if (e.Address == 0x21)
{
if (e.EventType == MemoryAccessEventType.BeforePortRead)
{
e.CancelMemoryAccess = true;
e.Value = chPorts.ReadStatus();
}
else if (e.EventType == MemoryAccessEventType.BeforePortWrite)
{
e.CancelMemoryAccess = true;
chPorts.WriteCommand(e.Value);
if (e.Value == CMD_RD_USB_DATA0 || e.Value == CMD_WR_HOST_DATA)
{
waitingMultiDataTransferLength = true;
}
}
}
else if (e.Address == 0xAA)
{
if (e.EventType == MemoryAccessEventType.AfterPortWrite)
{
var wasOn = (aaPortValue & 0x40) == 0;
var on = (e.Value & 0x40) == 0;
if (on != wasOn)
{
Debug.WriteLine("CAPS " + (on ? "ON" : "OFF"));
}
aaPortValue = e.Value;
}
else if (e.EventType == MemoryAccessEventType.AfterPortRead)
{
e.Value = aaPortValue;
}
}
}