环境：
Windows7 64b，jdk64b，myeclipse8.5，rxtx开发包，STC，keil，格西烽火，51单片机，rs232USB转串口线。
下位机c代码
#include <reg51.h>
#include <string.h>
#define INBUF_LEN 7 //数据长度
unsigned char inbuf1[INBUF_LEN];
unsigned char checksum,count3,count=0;
bit read_flag=0;
unsigned char com[]="hello\n";
void init_serialcomm(void)
{
TMOD=0x20;//设置定时器1为模式2
TH1=0xfd;//装初值设定波特率
TL1=0xfd;
TR1=1;//启动定时器
SM0=0;//串口通信模式设置
SM1=1;
}
void delay_1s() //1s
{
unsigned int i;
for(i=0;i<45000;i++)
{
}
}
void delay_1us() //1s
{
unsigned int i;
for(i=0;i<45;i++)
{
}
}
//向串口发送一个字符
void send_char_com(char ch)
{
SBUF=ch;
while(TI==0);
TI=0;
delay_1us();
}
//向串口发送一个字符串，strlen为该字符串长度
void send_string_com(char *str,int strlen)
{
int k=0;
do
{
send_char_com(*(str + k));
k++;
} while(k < strlen);
}
//串口接收中断函数
void serial () interrupt 4 using 3
{
if(RI)
{
unsigned char ch1;
RI = 0;
ch1=SBUF;
inbuf1[count++]=ch1;
if(count==INBUF_LEN)
{
read_flag=1; //如果串口接收的数据达到INBUF_LEN个，且校验没错，
count=0; //就置位取数标志
}
}
}
main()
{
init_serialcomm(); //初始化串口
delay_1s();
send_string_com("10.7",4);
return 1;
}
上位机java代码
import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.*;
public class TwoWaySerialComm
{
public TwoWaySerialComm()
{
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();
(new Thread(new SerialReader(in))).start();
(new Thread(new SerialWriter(out))).start();
}
else
{
System.out.println("Error: Only serial ports are handled by this example.");
}
}
}
/** */
public static class SerialReader implements Runnable
{
InputStream in;
public SerialReader ( InputStream in )
{
this.in = in;
}
public void run ()
{
byte[] buffer = new byte[1024];
int len = -1;
String com_get="";
DBInsert DI=new DBInsert();
try
{
while ( ( len = this.in.read(buffer)) > -1 )
{
//延时10秒
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//com_get保存串口数据
com_get=new String(buffer,0,2);
System.out.print(com_get);
}
}
catch ( IOException e )
{
e.printStackTrace();
}
}
}
/** */
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();
}
}
}
public static void main ( String[] args )
{
try
{
(new TwoWaySerialComm()).connect("COM3");
}
catch ( Exception e )
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
可能出现的问题
获取到的是乱码
可能是没打开单片机的开关按钮
提示open方法错误
可能是没关闭格西烽火或者myeclipse，两者不能同时打开。
提示找不到串口
检查下你的STC和代码，看是否端口正确。