/// <summary>
/// Callback function for sender ready event
/// </summary>
/// <param name="ar"></param>
private static void SendCallback(IAsyncResult ar)
{
// Retrieve the communication object from the state object.
UARTCommunicator communicator = (UARTCommunicator)ar.AsyncState;
try
{
// Retrieve serial port
SerialPort serial_port = communicator.m_serial_port;
// Complete sending the data to the remote device.
serial_port.BaseStream.EndWrite(ar);
Interlocked.Add(ref communicator.m_downstream_bytes, communicator.m_transmit_data_length);
// Signal that all bytes have been sent.
communicator.m_sender_lock.Release();
// signal communication manager about the freed buffer
communicator.m_communication_manager.GenerateEvent();
}
catch
{
// stop thread because of the unexpected error
communicator.m_stop_requested = true;
communicator.m_thread_event.Set();
}
}
/// <summary>
/// Callback function for data received event
/// </summary>
/// <param name="ar"></param>
private static void ReceiveCallback(IAsyncResult ar)
{
// Retrieve the communication object from the state object.
UARTCommunicator communicator = (UARTCommunicator)ar.AsyncState;
if (communicator == null)
{
return;
}
try
{
// Retrieve serial port
SerialPort serial_port = communicator.m_serial_port;
if (serial_port != null)
{
// Read data from the remote device.
int bytes_read = serial_port.BaseStream.EndRead(ar);
if (bytes_read > 0)
{
communicator.m_received_data_length = bytes_read;
communicator.m_thread_event.Set();
}
else
{
communicator.m_read_pending = false;
communicator.m_thread_event.Set();
}
}
}
catch
{
// stop thread because of the unexpected error
communicator.m_stop_requested = true;
communicator.m_thread_event.Set();
}
}
