CCS/MSP430F5529: Uart backchannel driverlib problem

Tool/software: Code Composer Studio

Hello I am very new to the msp430 microcontrollers. now iam finding difficult to run usci uartA1 backchannel to echo characters using msp430 driverlib. Here is my code taken from example codes with slight changes made for using uart backchannel. Hope i could get the problem solved. I think i have done everything correctly, please let me know where i went wrong.

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//******************************************************************************
//! This example shows how to configure the UART module as the loopback to
//! verify that received data is sent data.
//!
//!               MSP430F5438A
//!             -----------------
//!       RST -|     P3.4/UCA0TXD|----|
//!            |                 |    |
//!            |                 |    |
//!            |     P3.5/UCA0RXD|----|
//!            |                 |
//!
//!
//! This example uses the following peripherals and I/O signals.  You must
//! review these and change as needed for your own board:
//! - UART peripheral
//! - GPIO Port peripheral (for UART pins)
//! - UCA0TXD
//! - UCA0RXD
//!
//! This example uses the following interrupt handlers.  To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - USCI_A0_VECTOR.
//******************************************************************************
#include "driverlib.h"

//*****************************************************************************
//
//Select Baud rate
//
//*****************************************************************************
#define BAUD_RATE                               9600
//*****************************************************************************
//
//Initialize received data
//
//*****************************************************************************
uint8_t receivedData = 0x00;
//*****************************************************************************
//
//Initialize trasnmit data
//
//*****************************************************************************
uint8_t transmitData = 0x00;

uint8_t check = 0;

void main (void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);

    //P3.4,5 = USCI_A0 TXD/RXD
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P4,
        GPIO_PIN4 + GPIO_PIN5
        );

    //Baudrate = 9600, clock freq = 1.048MHz
    //UCBRx = 109, UCBRFx = 0, UCBRSx = 2, UCOS16 = 0
    USCI_A_UART_initParam param = {0};
    param.selectClockSource = USCI_A_UART_CLOCKSOURCE_SMCLK;
    param.clockPrescalar = 109;
    param.firstModReg = 0;
    param.secondModReg = 2;
    param.parity = USCI_A_UART_NO_PARITY;
    param.msborLsbFirst = USCI_A_UART_LSB_FIRST;
    param.numberofStopBits = USCI_A_UART_ONE_STOP_BIT;
    param.uartMode = USCI_A_UART_MODE;
    param.overSampling = USCI_A_UART_LOW_FREQUENCY_BAUDRATE_GENERATION;

    if (STATUS_FAIL == USCI_A_UART_init(USCI_A1_BASE, &param)){
        return;
    }

    //Enable UART module for operation
    USCI_A_UART_enable(USCI_A1_BASE);

    //Enable Receive Interrupt
      USCI_A_UART_clearInterrupt(USCI_A1_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT);
    USCI_A_UART_enableInterrupt(USCI_A1_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT);

    __enable_interrupt();

    while (1)
    {
        transmitData = transmitData+1;                      // Increment TX data
        // Load data onto buffer
        USCI_A_UART_transmitData(USCI_A1_BASE,
                transmitData);
        while(check != 1);
        check = 0;
    }
}

//******************************************************************************
//
//This is the USCI_A0 interrupt vector service routine.
//
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A1_BASE
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(USCI_A1_BASE)))
#endif
void USCI_A1_ISR (void)
{
    switch (__even_in_range(UCA1IV,4)){
        //Vector 2 - RXIFG
        case 2:

            receivedData = USCI_A_UART_receiveData(USCI_A1_BASE);
            if(!(receivedData == transmitData))                   // Check value
            {
              while(1);
            }
            check =1;
            break;
        default: break;
    }
}