Raspberry Pi Forums

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fd = open("/dev/serial0", O_RDWR | O_NDELAY | O_NOCTTY | O_NONBLOCK);

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n = read( fd, value, 1 );
if (n < 0) {
printf ( "Error = %s\n", strerror( errno ) );
}
else if (n == 0) {
  printf ( "Read Nothing...\n");
}

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int setAttr(int fd)
{
    //Read the configureation of the port 
    struct termios options;
    tcgetattr( fd, &options );

    //Set Baud Rate 
    cfsetispeed( &options, B9600 );
    cfsetospeed( &options, B9600 );

    //Setting other Port Stuff 
    options.c_cflag &= ~PARENB; /*Make 8n1 */
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE; /* Mask the character size bits */
    options.c_cflag |= CS8;    /* Select 8 data bits */
    options.c_cflag &= ~CRTSCTS;  /* No flow control */
    options.c_cc[VMIN] = 0; /*READ doesn't block */
    options.c_cc[VTIME] = 1; /* 0.1 seconds read timout */
    options.c_cflag |= CREAD | CLOCAL; /* Turn on READ & ignore crtl lines */

    cfmakeraw(&options);

    //Flush port, then applies attributes
    tcflush(fd, TCIOFLUSH);

    return tcsetattr( fd, TCSANOW, &options );
}

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if (fd == -1)
        {
          /*
           * Could not open the port.
           */
     
          perror("open_port: Unable to open /dev/serial0 - ");
        }
else fcntl(fd, F_SETFL, O_NONBLOCK);