Java Marine API – 寻找NMEA数据

我的最终目标是从Adafruit Ultimate GPS(NMEA 0183标准)到我的Java应用程序接收lat和长GPS信息.我正在使用Java Marine API来执行此操作.然后将当前位置与时间戳一起写入DB.

到目前为止,我已成功(我认为)配置RXTX以通过USB端口启用com. Java Marine API附带了一些示例.java文件.下面的例子应该扫描所有现有的COM端口并寻找NMEA数据 – 但是当我运行它时,我只得到输出

扫描端口/dev/tty.Bluetooth-Incoming-Port

GPS已连接,当我通过终端访问它时,可以看到它的流数据.

请原谅这个文本转储,我有点超出我的深度,我不确定哪些部分是相关的.

public class SerialPortExample implements SentenceListener {

public SerialPortExample() {
    init();}

public void readingPaused() {
    System.out.println("-- Paused --");}

public void readingStarted() {
    System.out.println("-- Started --");}

public void readingStopped() {
    System.out.println("-- Stopped --");}

public void sentenceRead(SentenceEvent event) {
    // here we receive each sentence read from the port
    System.out.println(event.getSentence());}

private SerialPort getSerialPort() {
    try {
        Enumeration<?> e = CommPortIdentifier.getPortIdentifiers();

        while (e.hasMoreElements()) {
            CommPortIdentifier id = (CommPortIdentifier) e.nextElement();
            if (id.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                SerialPort sp = (SerialPort) id.open("SerialExample", 30);
                sp.setSerialPortParams(4800, SerialPort.DATABITS_8,
                        SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                InputStream is = sp.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader buf = new BufferedReader(isr);

                System.out.println("Scanning port " + sp.getName());

                // try each port few times before giving up
                for (int i = 0; i < 5; i++) {
                    try {
                        String data = buf.readLine();
                        if (SentenceValidator.isValid(data)) {
                            System.out.println("NMEA data found!");
                            return sp;}
                    } catch (Exception ex) {
                        ex.printStackTrace();}}
                is.close();
                isr.close();
                buf.close();}
        }
        System.out.println("NMEA data was not found..");
    } catch (Exception e) {
        e.printStackTrace();}
    return null;}
private void init() {
    try {SerialPort sp = getSerialPort();
        if (sp != null) {
            InputStream is = sp.getInputStream();
            SentenceReader sr = new SentenceReader(is);
            sr.addSentenceListener(this);
            sr.start(); }

    } catch (IOException e) {
        e.printStackTrace();}}

public static void main(String[] args) {
    new SerialPortExample();}}

所以我认为它看着tty.Bluetooth-Incoming-Port？我怎样才能看到tty.usbserial端口？

谢谢

解决方法:

你接近连接^^

当您扫描系统以获取com-ports时,只需打印出来！

while (e.hasMoreElements()) {
    CommPortIdentifier id = (CommPortIdentifier) e.nextElement();
    if(serialPortId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
        System.out.println(serialPortId.getName());//print the serial port name
    }
}

你的输出应该是这样的

Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
/dev/ttyS1
/dev/ttyS0

既然您知道串口的名称,您可以使用此信息打开该端口！假设你的GPS连接到串口ttyS1 ……

再次进入你的代码,并像这样适应：

enumComm = CommPortIdentifier.getPortIdentifiers();
while(enumComm.hasMoreElements()) {
    serialPortId = (CommPortIdentifier) enumComm.nextElement();
    if (serialPortId.getName().equalsIgnoreCase("/dev/ttyS1")) { //HERE you get your serial port

        try {
            SerialPort sp = (SerialPort) id.open("SerialExample", 30);
            //continue with your code here
        } catch (PortInUseException e) {
            System.out.println("port in use");
        }
    }
}

这只能起作用,因为你的usb设备创建了一个虚拟串口！

标签：java,gps,rxtx
来源： https://codeday.me/bug/20190529/1175109.html