Com-port скорость

if ((comfd = open(portname, O_RDWR|O_NOCTTY)) < 0){
        WARN(_("Can't use port %s"), portname);
        return 1;
    }
    if(tcgetattr(comfd, &oldtty) < 0){ // Get settings
        WARN(_("Can't get old TTY settings"));
        return 1;
    }
    tty = oldtty;
    tty.c_lflag     = 0; 
    tty.c_iflag     = 0;
    tty.c_oflag     = 0;
    tty.c_cflag     = B115200|CS8|CREAD|CLOCAL;
    tty.c_cc[VMIN]  = 0;  // non-canonical mode
    tty.c_cc[VTIME] = 1;
    if(tcsetattr(comfd, TCSANOW, &tty) < 0){
        WARN(_("Can't apply new TTY settings"));
        return globErr 1;
    }

#define SPEED 115200
    int fd, ret;
    struct termios2 config;
 
    fd = open("/dev/ttyUSB0", O_RDWR);
    if (fd < 0){
        printf("Failed to open /dev/ttyS1 - fd = %d\n", fd);
        return -1;
    }
 
    // Set custom buad rate
    ret = ioctl(fd, TCGETS2, &config);
    if(!ret){
        config.c_cflag &= ~CBAUD;
        config.c_cflag |= BOTHER;
        config.c_ispeed = SPEED;
        config.c_ospeed = SPEED;
        ret = ioctl(fd, TCSETS2, &config);
        if(!ret) printf("set speed to %d, ret=%d\n", SPEED, ret);
    } else { /*error*/}.
    ioctl(fd, TCGETS2, &config); // need to check return
    printf("ispeed: %d, ospeed: %d, cflag=%d (BOTHER=%d)\n", config.c_ispeed, config.c_ospeed, config.c_cflag&CBAUD, BOTHER);
    system("stty -F /dev/ttyS1");