public void DiscardOutBuffer()
{
if (!fd.HasValue)
{
throw new Exception();
}
ComWrapper.com_tcoflush(fd.Value);
}
public void Close()
{
if (!fd.HasValue)
{
throw new Exception();
}
cts.Cancel();
ComWrapper.com_close(fd.Value);
Marshal.FreeHGlobal(readingBuffer);
}
public void Write(byte[] buf, int offset, int len)
{
if (!fd.HasValue)
{
throw new Exception();
}
IntPtr ptr = Marshal.AllocHGlobal(len);
Marshal.Copy(buf, offset, ptr, len);
ComWrapper.com_write(fd.Value, ptr, len);
Marshal.FreeHGlobal(ptr);
}
public void Open()
{
// open serial port
int fd = ComWrapper.com_open(portName);
if (fd == -1)
{
throw new Exception($"failed to open port ({portName})");
}
ComWrapper.com_set_interface_attribs(fd, baudRate, dataBits, (int)parity, (int)stopBits);
// start reading
//Task.Run((Action)StartReading, CancellationToken);
this.fd = fd;
}
public int Read(byte[] buf, int offset, int len)
{
if (!fd.HasValue || len > READING_BUFFER_SIZE)
{
throw new Exception();
}
int res = ComWrapper.com_read(fd.Value, readingBuffer, len);
if (res != -1)
{
Marshal.Copy(readingBuffer, buf, offset, res);
}
else
{
throw new Exception();
}
return(res);
}
private void StartReading()
{
if (!fd.HasValue)
{
throw new Exception();
}
while (true)
{
CancellationToken.ThrowIfCancellationRequested();
int res = ComWrapper.com_read(fd.Value, readingBuffer, READING_BUFFER_SIZE);
if (res != -1)
{
byte[] buf = new byte[res];
Marshal.Copy(readingBuffer, buf, 0, res);
OnDataReceived(buf);
}
Thread.Sleep(50);
}
}
