Compiler/EK-TM4C1294XL: Hardware interrupt on SW1 and SW2 on launchpad

Tool/software: TI C/C++ Compiler

Hello,

I have been trying a solution in a thread to get GPIO interrupt working on EK-TM4C1294XL launchpad ( https://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/p/332605/1786938 )

The solution is given for TM4C123 so I have changed the port and pin to match with my board but it doesn't work. I already have a lot going on in my work-space (UARTs/ADC/Web server) so i am adding a few important things to verify:

Clock: 

    g_ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
    SYSCTL_OSC_MAIN |
    SYSCTL_USE_PLL |
    SYSCTL_CFG_VCO_480), 120000000);
    //
    // Configure the device pins.
    //
    // Configure SysTick for a 100Hz interrupt.

    SysTickPeriodSet(g_ui32SysClock / 100);
    SysTickEnable();
    SysTickIntEnable();

Interrupt configuration: 

    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);        // Enable port J
    GPIOPinTypeGPIOInput(GPIO_PORTJ_BASE, GPIO_PIN_0);  // Init PJ1 as input
    GPIOPadConfigSet(GPIO_PORTJ_BASE, GPIO_PIN_0,
                     GPIO_STRENGTH_4MA, GPIO_PIN_TYPE_STD_WPU);  // Enable weak pullup resistor for PJ1


    //---------------------------------------------- Interrupt setuü -----------------------------------------
    GPIOIntDisable(GPIO_PORTJ_BASE, GPIO_PIN_0);        // Disable interrupt for PJ1 (in case it was enabled)
    GPIOIntClear(GPIO_PORTJ_BASE, GPIO_PIN_0);      // Clear pending interrupts for PJ1
    GPIOIntRegister(GPIO_PORTJ_BASE, onButtonDown);     // Register our handler function for port J
    GPIOIntTypeSet(GPIO_PORTJ_BASE, GPIO_PIN_0,
        GPIO_FALLING_EDGE);             // Configure PF4 for falling edge trigger
    GPIOIntEnable(GPIO_PORTJ_BASE, GPIO_PIN_0);     // Enable interrupt for PJ1

ISR:

void onButtonDown(void) {
    if (GPIOIntStatus(GPIO_PORTJ_BASE, false) & GPIO_PIN_0) {
        // PF4 was interrupt cause
        UARTprintf("Button Down\n");
//        GPIOIntRegister(GPIO_PORTJ_BASE, onButtonUp);   // Register our handler function for port F
//        GPIOIntTypeSet(GPIO_PORTJ_BASE, GPIO_PIN_0,
//            GPIO_RISING_EDGE);          // Configure PF4 for rising edge trigger
        GPIOIntClear(GPIO_PORTJ_BASE, GPIO_PIN_0);  // Clear interrupt flag
    }
}
void onButtonUp(void) {
    if (GPIOIntStatus(GPIO_PORTJ_BASE, false) & GPIO_PIN_0) {
        // PF4 was interrupt cause
        UARTprintf("Button Up\n");
        GPIOIntRegister(GPIO_PORTJ_BASE, onButtonDown); // Register our handler function for port F
        GPIOIntTypeSet(GPIO_PORTJ_BASE, GPIO_PIN_0,
            GPIO_FALLING_EDGE);         // Configure PF4 for falling edge trigger
        GPIOIntClear(GPIO_PORTJ_BASE, GPIO_PIN_0);  // Clear interrupt flag
    }
}

The Switch on launchpad SW1 and SW2 connected to J0 and J1, here i have tried to configure interrupt only of one button. Please let me know the valid method to initialize the GPIO interrupts and their priority.