利用select接收串口数据 亲测可用小demo

/*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");    }  }