RXTX雙向串行通信在第一次運行後不發送數據

Question

我編輯了RXTX網站上的一個已有的示例。我也是Java和串行通信編程的新手。

該應用程序運行完美一次。它從PIC讀取緩衝區併發送我輸入的號碼。 LED燈和PIC發回相同的緩衝區，請求一個數字。但是當我進入它時，指示燈熄滅，沒有再亮起，我再次收到要求輸入數字的信息。

微控制器的軟件沒有問題，因爲它可以與超級終端完美配合。

的代碼如下：

import gnu.io.CommPort; 
import gnu.io.CommPortIdentifier; 
import gnu.io.SerialPort; 
import gnu.io.SerialPortEvent; 
import gnu.io.SerialPortEventListener; 

import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 

/** 
* This version of the TwoWaySerialComm example makes use of the 
* SerialPortEventListener to avoid polling. 
* 
*/ 
public class Test 
{ 
    public Test() 
    { 
     super(); 
    } 

    void connect (String portName) throws Exception 
    { 
     CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName); 
     if (portIdentifier.isCurrentlyOwned()) 
     { 
      System.out.println("Error: Port is currently in use"); 
     } 
     else 
     { 
      CommPort commPort = portIdentifier.open(this.getClass().getName(),2000); 

      if (commPort instanceof SerialPort) 
      { 
       SerialPort serialPort = (SerialPort) commPort; 
       serialPort.setSerialPortParams(9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE); 

       InputStream in = serialPort.getInputStream(); 
       OutputStream out = serialPort.getOutputStream(); 

       serialPort.addEventListener(new SerialReader(in)); 
       serialPort.notifyOnDataAvailable(true); 

       (new Thread(new SerialWriter(out))).start(); 

      } 
      else 
      { 
       System.out.println("Error: Only serial ports are handled by this example."); 
      } 
     }  
    } 

    /** 
    * Handles the input coming from the serial port. A new line character 
    * is treated as the end of a block in this example. 
    */ 
    public static class SerialReader implements SerialPortEventListener 
    { 
     private InputStream in; 
     private byte[] buffer = new byte[1024]; 

     public SerialReader (InputStream in) 
     { 
      this.in = in; 
     } 

     public void serialEvent(SerialPortEvent arg0) { 
      int data; 

      try 
      { 
       int len = 0; 
       while ((data = in.read()) > -1) 
       { 
        if (data == '\n') { 
         break; 
        } 
        buffer[len++] = (byte) data; 
       } 
       System.out.print(new String(buffer,0,len)); 
      } 
      catch (IOException e) 
      { 
       e.printStackTrace(); 
       System.exit(-1); 
      }    
     } 

    } 

    /** */ 
    public static class SerialWriter implements Runnable 
    { 
     OutputStream out; 

     public SerialWriter (OutputStream out) 
     { 
      this.out = out; 
     } 

     public void run() 
     { 
      try 
      {     
       int c = 0; 
       while ((c = System.in.read()) > -1) 
       { 
        this.out.write(c); 
       }     
      } 
      catch (IOException e) 
      { 
       e.printStackTrace(); 
       System.exit(-1); 
      }    
     } 
    } 



    public static void main (String[] args) 
    { 
     try 
     { 
      (new Test()).connect("COM3"); 
     } 
     catch (Exception e) 
     { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 


} 

Answer 1

你的問題不明確（對我來說），因爲它不是清除已設定什麼PIC做的正是。我的猜測是，你對圍繞\ n字符作爲終結者的期望是什麼導致了一個問題。