我找到了一个通过串行端口在 Java 中与 Arduino 进行通信的代码,并想尝试让它工作以扩展它以实现项目创意,但我不断收到此错误
Stable Library
=========================================
Native lib Version = RXTX-2.2-20081207 Cloudhopper Build rxtx.cloudhopper.net
Java lib Version = RXTX-2.1-7
WARNING: RXTX Version mismatch
Jar version = RXTX-2.1-7
native lib Version = RXTX-2.2-20081207 Cloudhopper Build rxtx.cloudhopper.net
Could not find COM port.
Started
我认为这意味着 RXTX 库存在 jar 不匹配,但 native 库中构建的链接是一个网站不再存在。我不确定如何解决这个问题。如果您认为这是问题所在,我的代码如下。任何帮助,将不胜感激。
import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.InputStream;
import java.util.Enumeration;
public class AraInterface {
SerialPort serialPort;
/** The port we're normally going to use. */
private static final String PORT_NAMES[] = {
"/dev/tty.usbserial-A9007UX1", // Mac OS X
"/dev/ttyUSB0", // Linux
"COM35", // Windows //shin: ardu com port here
};
private InputStream input;
private OutputStream output;
private static final int TIME_OUT = 2000;
private static final int DATA_RATE = 9600;
public void initialize() {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
for (String portName : PORT_NAMES) {
if (currPortId.getName().equals(portName)) {
portId = currPortId;
break;
}
}
}
if (portId == null) {
System.out.println("Could not find COM port.");
return;
}
try {
serialPort = (SerialPort) portId.open(this.getClass().getName(),
TIME_OUT);
serialPort.setSerialPortParams(DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
input = serialPort.getInputStream();
output = serialPort.getOutputStream();
serialPort.addEventListener((SerialPortEventListener) this);
serialPort.notifyOnDataAvailable(true);
} catch (Exception e) {
System.err.println(e.toString());
}
}
public synchronized void close() {
if (serialPort != null) {
serialPort.removeEventListener();
serialPort.close();
}
}
public synchronized void serialEvent(SerialPortEvent oEvent) {
if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
try {
int available = input.available();
byte chunk[] = new byte[available];
input.read(chunk, 0, available);
String temp = new String (chunk);
String ref = "Hel";
if(temp.compareTo(ref)==0){
System.out.println("Hello World request received");
}
else{
System.out.println("lala" + temp);
}
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
public static void main(String[] args) throws Exception {
AraInterface main = new AraInterface();
main.initialize();
System.out.println("Started");
}
}
最佳答案
sudo apt-get install librxtx-java
转到安装路径 --- 在我的情况下
/usr/share/java/RXTXcomm.jar
System.getProperty("java.library.path")
) 以了解文件夹。 librxtxSerial.so
到 Java 库路径 - 就我而言sudo cp -r /usr/lib/jni/librxtxSerial.so /usr/lib/x86_64-linux-gnu
之后再次尝试您的代码。
关于java - RXTX 版本不匹配,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22592188/