public void ReadOneValueEmptiesFifo()
{
var fifo = new FifoBuffer <int>(5);
fifo.Write(99);
int result;
Assert.IsTrue(fifo.Read(out result));
Assert.IsFalse(fifo.Read(out result));
}
public void ReadEmptyFifoReturnsFalse()
{
var fifo = new FifoBuffer <KeyboardEvent>(5);
KeyboardEvent result;
Assert.IsFalse(fifo.Read(out result));
Assert.IsNull(result);
}
void ReadCallback(object state)
{
FifoBuffer fifoBuffer = _stream._fifoRead;
fifoBuffer.WaitHandle.WaitOne();
int bytesRead = Math.Min(fifoBuffer.Available, _count);
_bytesRead = fifoBuffer.Read(_buffer, _offset, bytesRead);
_completed = true;
_mre.Set();
if (_callback != null)
{
_callback(this);
}
}
internal override int DeviceRead(byte[] Data)
{
if (!_isInitialized)
{
return(-1);
}
if (_isReadFailure)
{
// retry reading, and let the user determine when to close
_isReadFailure = false;
_asyncResult = null;
StartRead();
return(-1);
}
int bytesRead = _fifoToDevice.Read(Data, 0, Data.Length);
return(bytesRead);
}
public byte Read(ushort address)
{
lock (this)
{
Debug.Assert(address < Size);
KeyboardEvent evt;
switch (address)
{
case CONTROL_REGISTER:
return(_controlRegister);
case STATUS_REGISTER:
if (_eventBuffer.Read(out evt))
{
_current = evt;
return(evt.Status);
}
_current = null;
break;
case DATA_REGISTER:
if (_current != null)
{
return(_current.Data);
}
return(0x00);
case SCAN_CODE_REGISTER:
if (_current != null)
{
return(_current.Data);
}
return(0x00);
}
}
return(0x00);
}
public override int Read(byte[] buffer, int offset, int count)
{
return(_fifoRead.Read(buffer, offset, count));
}
