TM4C123 UARTCharPut and Interrupt Problem

Hello everyone,

I'm using

TIVA-C (TM4C123G) Launchpad,

Code Composer Studio Version: 6.1.1.00022

Hercules terminal)

I was trying to get interrupt TX and RX. After that, I want to 

For example  when terminal sends to me a data like this ''10 20 30 40'' , I want to reply ''50''.

Firstly I am trying to when terminal sends to me '1' , my code replies ' 2 '. 

But, here a problem, I am not see anything on terminal window without 'Enter Text'.

Here's my code,

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"

// Used by UART interrupt handlers

unsigned char ptr[10]; // Array for storing incoming UART characters

unsigned char ReceiveData; // Incoming UART character

unsigned long i=0; // UART character pointer.

void UARTIntHandler(void)
{
uint32_t ui32Status;

ui32Status = UARTIntStatus(UART0_BASE, true); //get interrupt status

UARTIntClear(UART0_BASE, ui32Status); //clear the asserted interrupts

while(UARTCharsAvail(UART0_BASE)) //loop while there are chars
{
// Grab a character

ReceiveData = (unsigned char) UARTCharGetNonBlocking(UART0_BASE);

// Hold it
// ptr[i] = ReceiveData;

if (ReceiveData=='1') UARTCharPutNonBlocking(UART0_BASE,'2');

UARTCharPut(UART0_BASE, '2');

// Proceed to next character
// i++;
//// hold and send data
//UARTCharPutNonBlocking(UART0_BASE, UARTCharGetNonBlocking(UART0_BASE)); //echo character

}

}

int main(void) {

SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 115200, (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));
IntMasterEnable(); //enable processor interrupts
IntEnable(INT_UART0); //enable the UART interrupt
UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_TX); //only enable RX and TX interrupts

UARTCharPut(UART0_BASE, 'E');
UARTCharPut(UART0_BASE, 'n');
UARTCharPut(UART0_BASE, 't');
UARTCharPut(UART0_BASE, 'e');
UARTCharPut(UART0_BASE, 'r');
UARTCharPut(UART0_BASE, ' ');
UARTCharPut(UART0_BASE, 'T');
UARTCharPut(UART0_BASE, 'e');
UARTCharPut(UART0_BASE, 'x');
UARTCharPut(UART0_BASE, 't');
UARTCharPut(UART0_BASE, ':');
UARTCharPut(UART0_BASE, ' ');

while (1)
{
//if (ReceiveData=='1'){ UARTCharPutNonBlocking(UART0_BASE,'2'); UARTCharPut(UART0_BASE, '2');}
}