Linux 虚拟串口（可用于在本机上模拟串口进行调试）

来源：互联网发布：美国研究生费用知乎编辑：程序博客网时间：2024/05/16 01:17

http://blog.sina.com.cn/s/blog_6cb543ef0100x90j.html

Python语言:

#! /usr/bin/env python
#coding=utf-8

import pty
import os
import select

def mkpty():
    #打开伪终端
    master1, slave = pty.openpty()
    slaveName1 = os.ttyname(slave)
    master2, slave = pty.openpty()
    slaveName2 = os.ttyname(slave)
    print '\nslavedevice names: ', slaveName1, slaveName2
    return master1, master2

if __name__ == "__main__":

    master1, master2 = mkpty()
    while True:
        rl, wl, el = select.select([master1,master2], [], [], 1)
        for master in rl:
            data = os.read(master, 128)
            print "read %d data." % len(data)
            if master==master1:
                os.write(master2, data)
            else:
                os.write(master1, data)

程序名叫mkptych.py，在终端里运行“python mkptych.py&”，这样就可以生成一个基于pty（伪终端）的虚拟端口对，两个设备名会显示在终端里。然后就可以利用这两个设备名在本机上进行虚拟串口之类的调试，使用完后用ps查看这个python进程的pid号，然后kill掉即可。

下面编写一个用上述虚拟串口的使用程序：

//receive.c

#include<stdio.h>

#include<string.h>

#include<malloc.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<unistd.h>

#include<termios.h>

#include<math.h>

#define MAX_BUFFER_SIZE512

int fd,s;

intopen_serial()

{

//这里的/dev/pts/2是使用mkptych.py虚拟的两个串口名字之一

fd = open("/dev/pts/2",O_RDWR|O_NOCTTY|O_NDELAY);

if(fd == -1)

{

perror("open serial porterror!\n");

return -1;

}

printf("open/dev/ttyS0.\n");

return 0;

}

intmain()

{

char hd[MAX_BUFFER_SIZE],*rbuf;

int flag_close,retv;

struct termiosopt;

retv =open_serial();

if(retv <0)

{

printf("Open serrial porterror!\n");

return -1;

}

tcgetattr(fd,&opt);

cfmakeraw(&opt);

cfsetispeed(&opt,B9600);

cfsetospeed(&opt,B9600);

tcsetattr(fd, TCSANOW,&opt);

rbuf = hd;

printf("Ready for receivingdata...\n");

while(1)

{

while((retv = read(fd,rbuf, 1)) > 0)

printf( "%c ",*rbuf);

}

printf("\n");

flag_close =close(fd);

if(flag_close ==-1)

printf("Close the devicefailure!\n");

return 0;

}

//send.c

#include<stdio.h>

#include<string.h>

#include<malloc.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<unistd.h>

#include<termios.h>

#define MAX_BUFFER_SIZE512

int fd,flag_close;

intopen_serial()

{

//这里的/dev/pts/1是使用mkptych.py虚拟的两个串口名字之一

fd = open("/dev/pts/1",O_RDWR | O_NOCTTY | O_NONBLOCK);

if(fd == -1)

{

perror("open serial porterror!\n");

return -1;

}

printf("Open serial portsuccess!");

return 0;

}

int main(int argc, char*argv[])

{

char sbuf[] = {"Hello, thisis a serial port test!\n"};

int retv;

struct termiosoption;

retv =open_serial();

if(retv <0)

{

perror("open serial porterror!\n");

return -1;

}

printf("Ready for sendingdata...\n");

tcgetattr(fd,&option);

cfmakeraw(&option);

cfsetispeed(&option,B9600);

cfsetospeed(&option,B9600);

tcsetattr(fd, TCSANOW,&option);

int length =sizeof(sbuf);

retv = write(fd, sbuf,length);

if(retv == -1)

{

perror("Write dataerror!\n");

return -1;

}

printf("The number of charsent is %d\n", retv);

return 0;

}

编译运行即可，呵呵

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