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int operateCardData::serial_set_speci_baud(struct serial_t *tty,int baud)
{
    struct serial_struct ss,ss_set;
    cfsetispeed(&tty->options,B38400);
    cfsetospeed(&tty->options,B38400);
    tcflush(tty->fd,TCIFLUSH);/*handle unrecevie char*/
    tcsetattr(tty->fd,TCSANOW,&tty->options);
    if((ioctl(tty->fd,TIOCGSERIAL,&ss)) <0){
        printf("BAUD: error to get the serial_struct info:%s\n",strerror(errno));
        return -1;
    }
    ss.flags = ASYNC_SPD_CUST;
    ss.custom_divisor = ss.baud_base / baud;
    if((ioctl(tty->fd,TIOCSSERIAL,&ss)) <0){
        printf("BAUD: error to set serial_struct:%s\n",strerror(errno));//ÔÚÕâÀï³öÏֵĴíÎó
        return -2;
    }
    ioctl(tty->fd,TIOCGSERIAL,&ss_set);
    printf("BAUD: success set baud to %d,custom_divisor=%d,baud_base=%d\n",
            baud,ss_set.custom_divisor,ss_set.baud_base);
    return 0;
}