串口波特率 修改

tracyjk1

请教下大牛们一个设置串口波特率的问题
int openGPRSdev(void)
{
  int fd;
  struct termios options;
  char dev[]="/dev/modem0";
  
  fd = open(dev, O_RDWR | O_NOCTTY | O_NDELAY);
  if(fd < 0) {
   printf("================================\n");
    perror("open dev fail!");
    return fd;
  }
  
  tcgetattr(fd, &options);
  cfsetospeed(&options, B9600);
  cfsetispeed(&options, B9600);
  printf("speed===========");
// cfgetispeed(&options);
  //cfgetospeed(&options);
  
  // Enable the receiver and set local mode...
  options.c_cflag |= (CLOCAL | CREAD);
  
  // No parity (8N1):
  options.c_cflag &= ~PARENB;
  options.c_cflag &= ~CSTOPB;
  options.c_cflag &= ~CSIZE;
  options.c_cflag |= CS8;
  
  // enable hardware flow control (CNEW_RTCCTS)
  // options.c_cflag |= CRTSCTS;
  
  // set raw input
  options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
  options.c_iflag &= ~(INLCR | ICRNL | IGNCR | IXON | IXOFF);
  
  // set raw output
  options.c_oflag &= ~OPOST;
  options.c_oflag &= ~OLCUC;
  options.c_oflag &= ~ONLRET;
  options.c_oflag &= ~ONOCR;
  options.c_oflag &= ~OCRNL;
  
  // Set the new options for the port...
  tcsetattr(fd, TCSANOW, &options);
  
  return fd;
}
为什么我的串口不能改成9600

ljysyn

别的波特率可以么？

emmoblin

// cfgetispeed(&options);
  //cfgetospeed(&options);

设置后在get出来，查看是否修改了？
还有set的时候要判断返回值