Linux 虚拟串口（可用于在本机上模拟串口进行调试）
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)
#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
#include
#include
#include
#include
#include
#include
#include
#include
#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
#include
#include
#include
#include
#include
#include
#include
#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