Я хочу читать данные из UART, я следовалэтот урок, функция записи работает, как и ожидалось, однако у меня проблемы с функцией чтения:

Это функция uart_init:

void uart_init()
{
 printf("\n +----------------------------------+");
 printf("\n |        Serial Port Write         |");
 printf("\n +----------------------------------+");

/*------------------------------- Opening the Serial Port -------------------------------*/

  fd = open("/dev/ttyUSB0",O_RDWR | O_NOCTTY| O_SYNC);      /* !!blocks the read  */
                                                            /* O_RDWR Read/Write access to serial port           */
                                                            /* O_NOCTTY - No terminal will control the process   */
                                                            /* O_NDELAY -Non Blocking Mode,Does not care about-  */
                                                            /* -the status of DCD line,Open() returns immediatly */                                        

 if(fd == -1)                                               /* Error Checking */
  printf("\n  Error! in Opening ttyUSB0  ");
 else
  printf("\n  ttyUSB0 Opened Successfully ");


 /*---------- Setting the Attributes of the serial port using termios structure --------- */

struct termios SerialPortSettings;          /* Create the structure                          */

tcgetattr(fd, &SerialPortSettings);         /* Get the current attributes of the Serial port */

cfsetispeed(&SerialPortSettings,B19200);        /* Set Read  Speed as 19200                       */
cfsetospeed(&SerialPortSettings,B19200);        /* Set Write Speed as 19200                       */

SerialPortS,ettings.c_cflag &= ~PARENB;          /* Disables the Parity   Enable bit(PARENB),So No Parity   */
SerialPortSettings.c_cflag &= ~CSTOPB;          /* CSTOPB = 2 Stop bits,here it is cleared so 1 Stop bit */
SerialPortSettings.c_cflag &= ~CSIZE;           /* Clears the mask for setting the data size             */
SerialPortSettings.c_cflag |=  CS8;             /* Set the data bits = 8                                 */

SerialPortSettings.c_cflag &= ~CRTSCTS;         /* No Hardware flow Control                         */
SerialPortSettings.c_cflag |= CREAD | CLOCAL;   /* Enable receiver,Ignore Modem Control lines       */ 


SerialPortSettings.c_iflag &= ~(IXON | IXOFF | IXANY);          /* Disable XON/XOFF flow control both i/p and o/p */
SerialPortSettings.c_iflag &= ~(ICANON | ECHO | ECHOE | ISIG);  /* Non Cannonical mode                            */

SerialPortSettings.c_oflag &= ~OPOST;/*No Output Processing*/

/* Setting Time outs */
SerialPortSettings.c_cc[VMIN] = 10; /* Read at least 10 characters */
SerialPortSettings.c_cc[VTIME] = 0; /* Wait indefinetly   */

if((tcsetattr(fd,TCSANOW,&SerialPortSettings)) != 0) /* Set the attributes to the termios structure*/
 printf("\n  ERROR ! in Setting attributes");
else
 printf("\n  BaudRate = 19200 \n  StopBits = 1 \n  Parity   = none");

}

функция приема:

void uart_receive()
{
 char read_buffer[32];   /* Buffer to store the data received              */
 int  bytes_read = 0;    /* Number of bytes read by the read() system call */
 int i = 0;

 bytes_read = read(fd,&read_buffer,10); /* Read the data                   */

 printf("\n\n  Bytes Rxed %d", bytes_read); /* Print the number of bytes read */
 printf("\n\n  ");

 for(i=0;i<bytes_read;i++)   /*printing only the received characters*/
 printf("%c",read_buffer[i]);

 printf("\n +----------------------------------+\n\n\n");
}

Основная функция:

void main(void)
{ 
  uart_init();
  /*------------------------------- Write data to serial port -----------------------------*/
  //uart_write_commande(write_buffer); //Write function works well
  uart_receive();

  close(fd);/* Close the Serial port */
}

РЕДАКТИРОВАТЬ

Я выполняю программу и жду получения байтов данных в UART, я отправляю данные с использованием UART, но функция чтения остается заблокированной.

Я использую Виртуальную машину с Ubunutu 14.04 на ней, и я не уверен, что использование эмулируемой UART может вызвать проблемы во время приема.