利用select接收串口数据亲测可用小demo

最新推荐文章于 2025-08-08 09:40:01 发布

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本文介绍了一个基于Linux环境下的串口通信程序实现方法，通过设置串口参数并使用多线程技术来实时接收和打印串口数据。程序详细展示了串口打开、配置以及数据读取的过程。

/*开启一个线程，用于接收串口数据并打印*/

#include     <stdio.h>  
#include     <stdlib.h>   
#include     <unistd.h>    
#include     <sys/types.h>  
#include     <sys/stat.h>  
#include     <fcntl.h>   
#include     <termios.h>  
#include     <errno.h>  
#include     <string.h>  
#include     <pthread.h>

int fd; 
fd_set rd;
void pthread_uartrecv(void)
{
    struct timeval tv;
    tv.tv_sec = 0;
    tv.tv_usec = 10000;
    
    int nread;
    char buff[8];
    bzero(buff,8);
    while(1)
    {
	FD_ZERO(&rd);
  	FD_SET(fd,&rd);
	//printf("here2\n");
  	if(FD_ISSET(fd,&rd))
  	{
	    //printf("here1\n");
    	    select(fd+1,&rd,NULL,NULL,NULL);
      	    nread = read(fd,buff,8);
	    buff[nread]='\0';
            printf("nread = %d,%s\n",nread,buff); 
        }
    }
}
    
int main()  
{  
     
    struct termios opt;   
    fd = open("/dev/ttyUSB0", O_RDWR|O_NOCTTY|O_NDELAY);    
    fcntl(fd, F_SETFL, 0); 

    tcgetattr(fd, &opt);        
    cfsetispeed(&opt, B9600);  
    cfsetospeed(&opt, B9600);  
    if(tcsetattr(fd, TCSANOW, &opt) != 0 )  
    {       
       perror("tcsetattr error1");  
       return -1;  
    }  
    opt.c_cflag &= ~CSIZE;    
    opt.c_cflag |= CS8;     
    opt.c_cflag &= ~CSTOPB;   
    opt.c_cflag &= ~PARENB;   
    opt.c_iflag &= ~INPCK;//opt.c_cflag &= ~INPCK;the last this is fault set  
    opt.c_cflag |= (CLOCAL | CREAD);  
    opt.c_cflag &= ~CRTSCTS;
    opt.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);  
    opt.c_oflag &= ~OPOST;  
    opt.c_oflag &= ~(ONLCR | OCRNL);    //添加的  
    opt.c_iflag &= ~(ICRNL | INLCR);  
    opt.c_iflag &= ~(IXON | IXOFF | IXANY);    //添加的   
    opt.c_cc[VTIME] = 8;  
    opt.c_cc[VMIN] = 10;  
      
    tcflush(fd, TCIOFLUSH);  
   
    printf("configure complete\n");  
     
    if(tcsetattr(fd, TCSANOW, &opt) != 0)  
    {  
        perror("serial error");  
        return -1;  
    }   
    
    pthread_t id;
    pthread_create(&id,NULL,(void*)pthread_uartrecv,NULL);
  
    while(1)  
    {    
        sleep(2);
	printf("this is main function\n");
    }  
}