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count = min(serial bytes received, serBuflength)
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At slower speeds the read method should not return due to receiving the number of bytes speci ed by the threshold value For example, if the baud rate is set at 9600 bps, we d expect to receive about 1 serial character (or byte 7) every millisecond8 assuming that the attached serial device is continuously transmitting In this case, we would expect the read method to return after the 100 millisecond timeout has expired with approximately 100 bytes of receive data copied to the supplied byte array At the highest supported baud rate of 115,200 bps, we d receive about 12 serial characters per millisecond (9600 bps * 12 = 115,200 bps) Again, assuming that the attached serial device is transmitting continuously, the number of bytes received in the 100 ms time-out window approximately 1200 is larger than serBuf In this case, read will return after the receive threshold of 1024 bytes
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7 We re reasonably safe in referring to the received serial characters as bytes because the port is con gured for 8 data bits 8 With 8 data bits, 1 stop bit, and the mandatory start bit result in 10 bits received on the wire for every 8 bits of data At 9600 bps, 1 bit is received every 104 microseconds This results in a total time of 1040 microseconds (or 104 milliseconds) per byte of serial data
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is reached We would expect to hit the receive threshold in less than the 100 ms time-out window Listing 38 SerialReader
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private class SerialReader implements Runnable { private byte[] serBuf; private Thread maint; private SerialReader(Thread maint, int size) { serBuf = new byte[size]; thismaint = maint; } public void run() { while (running) { try { // Read all available data in serial input buffer int count = spinread(serBuf, 0, serBuflength); if (count > 0) { // Blast serial data to network server soutwrite(serBuf, 0, count); serialTotal += count; } } catch (IOException ioe) { // Trouble communicating with server Systemoutprintln(ioegetMessage()); ioeprintStackTrace(); running = false; maintinterrupt(); break; } } } }
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The inner class SerialWriter is shown in Listing 39 SerialWriter s run method enters a loop that reads data available on the socket s InputStream and immediately writes the data to the serial port s OutputStream It also maintains a single 1024-byte buffer that is (re)used for moving data from the socket to the serial port SerialWriter s job is just a bit less complicated than that of SerialReader as it doesn t need to be concerned with receive time-outs and thresholds A time-out could be set for reads from the socket s InputStream, but in this example, it simply blocks until 1 or more bytes of data are available and returns the minimum of the data available and the buffer length If the remote server closes the network connection, the socket s InputStream read method returns 1 When this occurs, running is set to false and the maintenance thread is interrupted This will cause
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A Serial Ethernet Converter all three threads to eventually fall out of their will terminate Listing 39 SerialWriter
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private class SerialWriter implements Runnable { private byte[] ethBuf = new byte[1024]; private Thread maint; private SerialWriter(Thread maint) { thismaint = maint; } public void run() { int count = 0; while (running) { try { // Read all available data from network server count = sinread(ethBuf, 0, ethBuflength); if (count > 0) { // Write data received from network out serial port spoutwrite(ethBuf, 0, count); networkTotal += count; } else if (count == -1) { running = false; maintinterrupt(); } } catch (IOException ioe) { Systemoutprintln(ioegetMessage()); ioeprintStackTrace(); running = false; maintinterrupt(); break; } } } }
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For this application we wanted to move relatively large amounts of data between the serial port and the network If we only moved a byte (or even a few bytes) at a time, the CPU would be consumed, performing relatively heavyweight context switches moving back and forth from Java to the native OS This would dramatically reduce the overall throughput For this reason, a large receive threshold and buffer size were chosen for serial input Moving large buffers prorates the overhead of the expensive context switches mentioned previously Another way to possibly increase the overall throughput is to provide a large buffer for the driver s receive buffer, using the setInputBufferSize method described in Section 323 If the driver maintains a large receive buffer, it gives the application more time to service the buffer before the driver must tell the attached serial device to stop
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