// if XNA is being used, we need to do quite a bit of logic to make sure that the correct characters are output
private static void KeyDownHandler(Keys key)
{
switch (key)
{
case Keys.LeftShift:
case Keys.RightShift:
Shift = true;
Alt = true;
break;
case Keys.CapsLock:
Caps = true;
Alt = true;
break;
}
CharReceived?.Invoke(ResolveChar(@key));
}
public async void ReceiveMessages()
{
try
{
while (isListening)
{
uint sizeFieldCount = 0;
try
{
sizeFieldCount = await dataReader.LoadAsync(1);
}
catch (Exception e)
{
// ignore normal socket disconnections
if (e.HResult != -2147023901)
{
throw;
}
continue;
}
if (sizeFieldCount != 1)
{
isListening = false;
this.OnDisconnected?.Invoke(this.currentConnection);
break;
}
uint val = dataReader.ReadByte();
if (val < 255)
{
CharReceived?.Invoke((char)val);
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
this.Terminate();
}
}
private void SendBack()
{
byte[] data = receiveFifo.ToArray();
switch (data[2])
{
case 0x20: // SYSLINK_OW_SCAN
byte[] OwScanData = CreateMessage(0x20, 0x01, new byte[] { 0x00 });
for (int i = 0; i < OwScanData.Length; ++i)
{
CharReceived?.Invoke((byte)OwScanData[i]);
}
receiveFifo.Clear();
break;
default:
while (receiveFifo.Count > 0)
{
CharReceived?.Invoke((byte)receiveFifo.Dequeue());
}
break;
}
this.Log(LogLevel.Noisy, "Complete data sent back!");
}
protected void TransmitCharacter(byte character)
{
CharReceived?.Invoke(character);
}
private void DefineRegisters()
{
Register.Status.Define(this, 0xC0, "USART_SR")
.WithTaggedFlag("PE", 0)
.WithTaggedFlag("FE", 1)
.WithTaggedFlag("NF", 2)
.WithFlag(3, FieldMode.Read, valueProviderCallback: _ => false, name: "ORE") // we assume no receive overruns
.WithTaggedFlag("IDLE", 4)
.WithFlag(5, FieldMode.Read | FieldMode.WriteZeroToClear, name: "RXNE", valueProviderCallback: _ =>
{
return(readFifoNotEmpty);
}) // as these two flags are WZTC, we cannot just calculate their results
.WithFlag(6, out transmissionComplete, FieldMode.Read | FieldMode.WriteZeroToClear, name: "TC")
.WithFlag(7, FieldMode.Read, valueProviderCallback: _ => true, name: "TXE") // we always assume "transmit data register empty"
.WithTaggedFlag("LBD", 8)
.WithTaggedFlag("CTS", 9)
.WithReservedBits(10, 22)
.WithWriteCallback((_, __) => Update())
;
Register.Data.Define(this, name: "USART_DR")
.WithValueField(0, 9, valueProviderCallback: _ =>
{
byte value = 0;
lock (receiveFifo)
{
if (receiveFifo.Count > 0)
{
value = receiveFifo.Dequeue();
Update();
}
readFifoNotEmpty = receiveFifo.Count > 0;
}
return(value);
}, writeCallback: (_, value) =>
{
if (!usartEnabled.Value && !transmitterEnabled.Value)
{
this.Log(LogLevel.Warning, "Trying to transmit a character, but the transmitter is not enabled. dropping.");
return;
}
CharReceived?.Invoke((byte)value);
transmissionComplete.Value = true;
Update();
}, name: "DR"
)
;
Register.BaudRate.Define(this, name: "USART_BRR")
.WithValueField(0, 4, out dividerFraction, name: "DIV_Fraction")
.WithValueField(4, 12, out dividerMantissa, name: "DIV_Mantissa")
;
Register.Control1.Define(this, name: "USART_CR1")
.WithTaggedFlag("SBK", 0)
.WithTaggedFlag("RWU", 1)
.WithFlag(2, out receiverEnabled, name: "RE")
.WithFlag(3, out transmitterEnabled, name: "TE")
.WithTaggedFlag("IDLEIE", 4)
.WithFlag(5, out receiverNotEmptyInterruptEnabled, name: "RXNEIE")
.WithFlag(6, out transmissionCompleteInterruptEnabled, name: "TCIE")
.WithFlag(7, out transmitDataRegisterEmptyInterruptEnabled, name: "TXEIE")
.WithTaggedFlag("PEIE", 8)
.WithEnumField(9, 1, out paritySelection, name: "PS")
.WithFlag(10, out parityControlEnabled, name: "PCE")
.WithTaggedFlag("WAKE", 11)
.WithTaggedFlag("M", 12)
.WithFlag(13, out usartEnabled, name: "UE")
.WithReservedBits(14, 1)
.WithEnumField(15, 1, out oversamplingMode, name: "OVER8")
.WithReservedBits(16, 16)
.WithWriteCallback((_, __) => Update())
;
Register.Control2.Define(this, name: "USART_CR2")
.WithTag("ADD", 0, 4)
.WithReservedBits(5, 1)
.WithTaggedFlag("LBDIE", 6)
.WithReservedBits(7, 1)
.WithTaggedFlag("LBCL", 8)
.WithTaggedFlag("CPHA", 9)
.WithTaggedFlag("CPOL", 10)
.WithTaggedFlag("CLKEN", 11)
.WithEnumField(12, 2, out stopBits, name: "STOP")
.WithTaggedFlag("LINEN", 14)
.WithReservedBits(15, 17)
;
}
// If MonoGame is in use, we can easily take advantage of its build-in input handler
private static void TextInputHandler(object s, EventArgs e)
{
CharReceived?.Invoke((char)e.GetType().GetField("Character").GetValue(e));
}
private static void KeyHeldHandler(Keys key)
{
CharReceived?.Invoke(ResolveChar(key));
}
public void WriteDoubleWord(long offset, uint value)
{
this.NoisyLog("Received 0x{0:X}", value);
CharReceived?.Invoke((byte)value);
}