programming Tiva LaunchPad TM4C123G using CSS

objective:

(a) Flash the LED at a rate of one hertz.

(b) Each time SW1 is pressed, change the color of the LED in the following order: (Red->Blue->Green repeat)

I am attaching my code that is not showing an error and compiling without errors but there is no output, just the red light stays on.

//∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗ Included Files ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗// //∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗ Mapping Registers ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗//
#define SYSCTL_RCGC2 (*(( volatile unsigned long *)0x400FE108))
///∗∗∗∗ Port F ∗∗∗∗/

#define GPIO_PORTF_DATA (*(( volatile unsigned long *)0x400253FC))
#define GPIO_PORTF_DIR (*(( volatile unsigned long *)0x40025400))
#define GPIO_PORTF_AFSEL (*(( volatile unsigned long *)0x40025420))
#define GPIO_PORTF_DEN (*(( volatile unsigned long *)0x4002551C))

#define GPIO_PORTF_PUR (*(( volatile unsigned long *)0x40025510)) // p.677


void init_gpio (void );

// TODO: Add any necessary function declarations
//∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗ Global Variables ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗//
//∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗ Main ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗//
void delay(void)
{
    int k;
    for (k=1; k<=8000000; k++)
    {}
}

int main (void)
{

init_gpio ();


GPIO_PORTF_DIR |= 0x02;
GPIO_PORTF_DIR |= 0x04;
GPIO_PORTF_DIR |= 0x08;
GPIO_PORTF_DIR &= ~0x1;

GPIO_PORTF_PUR |= 0x10;
GPIO_PORTF_AFSEL |= 0x00;
GPIO_PORTF_DEN |= 0x1E;

int i=1;


while (1) {



    int pressed = !(GPIO_PORTF_DATA & 0x10);

if (i==1)
{
    while (pressed!=1)
    {
        GPIO_PORTF_DATA |= 0x02;
        delay();

        GPIO_PORTF_DATA &= ~0x02;
    }
}

else if (i==2)
{
    while (pressed!=1)

        {
            GPIO_PORTF_DATA |= 0x04;
            delay();

            GPIO_PORTF_DATA &= ~0x04;
        }
}

else if (i==3)
{
    while (pressed!=1)

        {
            GPIO_PORTF_DATA |= 0x08;
            delay();

            GPIO_PORTF_DATA &= ~0x08;
        }
}
else
    {
        i=0;
    }
}
}


//∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗ Function Definitions ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗//



void init_gpio (void)
{
volatile unsigned long delay_clk ; // Enable Clock Gating for PortF, p.340
SYSCTL_RCGC2 |= 0x00000020;// Wait a few clock cycles
delay_clk = SYSCTL_RCGC2; // See p.227 for more information .
// TODO: Add GPIO Initializations
}