CCS/LAUNCHXL-F28069M: Program does not enter Interrupt Service Routine

Tool/software: Code Composer Studio

Is there any mistake in configuring the SCIA Rx interrupt? My code is given below and it does not enter into the ISR.

//=============Beginning of code=============

#include "DSP28x_Project.h"   
#include "F2806x_Device.h" 

// Prototype statements for functions found within this file.
void scia_echoback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void scia_msg(char *msg);
__interrupt void sciaRxFifoIsr(void);

Uint16 IntC = 0;
// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount;

void main(void)
{

    Uint16 ReceivedChar;
    char *msg;


   InitSysCtrl();

   InitSciaGpio(); // For this example, only init the pins for the SCI-A port.
                   // This function is found in the F2806x_Sci.c file.

   DINT;// Disable CPU interrupts

   InitPieCtrl();// Initialize PIE control registers to their default state.

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;
   //PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
   //PieCtrlRegs.PIEIER9.bit.INTx1=1; // PIE Group 9, INT1
   //PieCtrlRegs.PIEIER9.bit.INTx2=1; // PIE Group 9, INT2
   EINT;


   InitPieVectTable();// Initialize the PIE vector table with pointers to the shell Interrupt Service Routines (ISR).

   EALLOW;
   PieVectTable.SCIRXINTA = &sciaRxFifoIsr;
   GpioCtrlRegs.GPAMUX2.bit.GPIO22 = 0;   //edited
   GpioCtrlRegs.GPADIR.bit.GPIO22 = 1;   //edited
   EDIS;

// Step 5. User specific code:

    LoopCount = 0;
    ErrorCount = 0;

    scia_fifo_init();      // Initialize the SCI FIFO
    scia_echoback_init();  // Initalize SCI for echoback

    msg = "\r\n\n\nHello World!\0";
    scia_msg(msg);



    for(;;)
    {
       msg = "\r\nEnter a character: \0";
       scia_msg(msg);

       // Wait for inc character
       while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for XRDY =1 for empty state

       // Get character
       ReceivedChar = SciaRegs.SCIRXBUF.all;

       // Echo character back
       msg = "  You sent: \0";
       scia_msg(msg);
       scia_xmit(ReceivedChar);
       //GpioDataRegs.GPATOGGLE.bit.GPIO22 = 1;
       //usDelay(1000000);

       LoopCount++;
    }

}


void scia_echoback_init()
{
    // Note: Clocks were turned on to the SCIA peripheral
    // in the InitSysCtrl() function

    SciaRegs.SCICCR.all =0x0007;   // 1 stop bit,  No loopback
                                   // No parity,8 char bits,
                                   // async mode, idle-line protocol
    SciaRegs.SCICTL1.all =0x0003;  // enable TX, RX, internal SCICLK,
                                   // Disable RX ERR, SLEEP, TXWAKE

    SciaRegs.SCICTL2.bit.TXINTENA =1;
    SciaRegs.SCICTL2.bit.RXBKINTENA =1;

    SciaRegs.SCIHBAUD    =0x0001;  // 9600 baud @LSPCLK = 22.5MHz (90 MHz SYSCLK).
    SciaRegs.SCILBAUD    =0x0024;

    SciaRegs.SCICTL1.all =0x0023;  // Relinquish SCI from Reset
}

// Transmit a character from the SCI
void scia_xmit(int a)
{
    while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {}
    SciaRegs.SCITXBUF=a;

}

void scia_msg(char * msg)
{
    int i;
    i = 0;
    while(msg[i] != '\0')
    {
        scia_xmit(msg[i]);
        i++;
    }
}

// Initalize the SCI FIFO
void scia_fifo_init()
{
    SciaRegs.SCIFFTX.all=0xE040;
    SciaRegs.SCIFFRX.all=0x2044;
    SciaRegs.SCIFFCT.all=0x0;

}

__interrupt void sciaRxFifoIsr(void)
{
    IntC++;
    //GpioDataRegs.GPATOGGLE.bit.GPIO22 = 1;
}
//============================End of File===============================================