A Serial Ethernet Converter Listing 36 SerialToEthernet in Java

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A Serial Ethernet Converter Listing 36 SerialToEthernet
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class SerialToEthernet extends Thread { // Use a 1K buffer for serial data receive private static final int INPUT_BUF_LEN = 1024; // Serial port and associated streams private SerialPort sp; private InputStream spin; private OutputStream spout; // Socket and associated streams private Socket s; private InputStream sin; private OutputStream sout; private SerialToEthernet(String server, int port, int speed) throws Exception { // Create and initialize serial port sp = (SerialPort) CommPortIdentifiergetPortIdentifier("serial0")open( "SerialToEthernet", 5000); // Enable the use of hardware handshake lines for serial0 TINIOSsetRTSCTSFlowControlEnable(0, true); // 8 data bits, 1 stop bit, no parity spsetSerialPortParams(speed, SerialPortDATABITS_8, SerialPortSTOPBITS_1, SerialPortPARITY_NONE); // Require RTS/CTS flow control from both serial channel // endpoints spsetFlowControlMode(SerialPortFLOWCONTROL_RTSCTS_IN | SerialPortFLOWCONTROL_RTSCTS_OUT); // Initialize serial port input and output streams spin = spgetInputStream(); spout = spgetOutputStream(); // Set a 100 millisecond receive timeout spenableReceiveTimeout(100); // Set the receive threshold equal to buffer length spenableReceiveThreshold(INPUT_BUF_LEN); // Connect to network server s = new Socket(server, port); sin = sgetInputStream(); sout = sgetOutputStream(); // Create and launch Serial -> Ethernet thread (new Thread(new SerialReader(this, INPUT_BUF_LEN)))start(); // Create and launch Ethernet -> Serial thread (new Thread(new SerialWriter(this)))start();
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// Launch maintenance thread superstart(); } }
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A receive time-out of 100 milliseconds and a receive threshold equal to the length of the serial port receive buffer are set to allow fairly large blocks of data to be read in an ef cient fashion from the input stream attached to the serial port After nishing the serial port con guration, a connection is established with the network server, and input and output streams are obtained for data transfer to and from the server Finally the constructor starts three new threads of execution Their tasks are as follows 1 SerialReader Reads from the serial port, writes to the socket 2 SerialWriter Reads from the socket, writes to the serial port 3 SerialToEthernet Provides periodic statistical updates The run method of the maintenance thread is shown in Listing 37 It writes the total number of bytes received from the serial port and the total number of bytes received from the network to the console (Systemout) and sleeps for about a minute This process is repeated as long as running is true The cumulative byte counts are maintained by the SerialReader and SerialWriter threads Both of the aforementioned threads keep a reference to the maintenance thread If a javaioIOException occurs in or the network connection is closed by the remote server, the thread (either SerialReader or SerialWriter) that detected the problem sets the running boolean to false and interrupts the maintenance thread The maintenance thread then falls out of the while loop and closes the serial port, socket, and all associated streams Listing 37 run
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private volatile boolean running = true; private int serialTotal = 0; private int networkTotal = 0; public void run() { while (running) { try { Threadsleep(60000); } catch (InterruptedException ie) {} Systemoutprintln("Bytes received from serial:"+serialTotal); Systemoutprintln("Bytes received from network:"+networkTotal); }
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A Serial Ethernet Converter
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try { // Close serial port and associated streams // Close socket and associated streams } catch (IOException e) {} }
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contains two inner classes: SerialReader and Each implement the Runnable interface so that they can each run as separate threads of execution This prevents either of the threads from having to block while the other is performing serial or network data transfer This helps achieve the goal of high-speed, full-duplex I/O The inner class SerialReader, shown in Listing 38, creates a byte array of the speci ed size that serves as a reusable buffer for serial receive data The run method enters a loop that reads data available from the serial port s InputStream and immediately writes that data to the socket s OutputStream In SerialToEthernet s constructor, we set a serial port read time-out of 100 milliseconds and a receive threshold equal to the length of the serial receive data buffer length (1024 bytes in this case) The number of bytes read (that is, the value of count) from the serial port s InputStream will be the minimum of the number of bytes received and the length of the input buffer
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