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
Scanning port /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
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!