Problem with receiving more than one character

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C++

C

microcontroller

Hallo evreyone,
I am a beginner doing projects with TTN
Currently I am working with Microchip SAMR34.I was trying to do a project where it reads the entered number and dsiplays it, The enetred number can be seen using an Emulator. I have used TeraTerm for this purpose.

The serial Data handler given in the example Project reads only one character, I have modified the code in such a way it reads more than one character at a time.The value received is stored int to a buffer SerialBuffer, But once number is entered for join request, its stops the application process and doesnot moves further.

The code given below is form the example project:

static char SerialBuffer;

void serial_data_handler(void)
{
    int rxChar;
    char serialData;
    /* verify if there was any character received*/
    if (startReceiving == true)
    {
        if((-1) != (rxChar = sio2host_getchar_nowait()))
        {
            serialData = (char)rxChar;
            if((serialData != ‘\r’) && (serialData != ‘\n’) && (serialData != ‘\b’))
            {
                startReceiving = false;
                serialBuffer = rxChar;
                appPostTask(PROCESS_TASK_HANDLER);
                printf("\r\n");
            }
        }
    }
}

What I have tried:

what i have tried: But it is not working !

void serial_data_handler(void)
{
    // uint8_t rxChar;
    char serialData;
    char arr[10];
    char recv;
    int i = 0;
    int value;
    recv = 0x00;

    /* verify if there was any character received*/
    if (startReceiving == true)
    {
        while(('\n' != recv)&&('\r' != recv) && ('\b' != recv))
        {
            recv = sio2host_getchar();
            arr[i] = recv;
            i++;		
        }
        //startReceiving = false;
        value =(int)atoi(arr);
        serialBuffer = value;
        appPostTask(PROCESS_TASK);
    }
}

if anyone has any idea, please share . It would be a great help!

Thanks