#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
 
#include "TM4C123GH6PM.h"
void initGPIO(void);
void Delay(int t);
 
int main(void)
{			
		initGPIO();
		int sample = 0x00;	
		
		for(;;){
			
			sample = GPIOF -> DATA;
			
			//SWITCH ONE ON
			if(!(sample & 0x10)){
					GPIOF -> DATA |= 0x02;
					Delay(2000);
					GPIOF -> DATA &= 0xFD;
			}
			
			//SWITCH TWO ON
			if(!(sample & 0x01)){
					GPIOF -> DATA |= 0x08;
					Delay(2000);
					GPIOF -> DATA &= 0xF7;
			}
		
		}
}

void initGPIO(void){
	
	  // GPIO Configuration
    // 1. Enable Clock on GPIOF[3:1] (SYSCTL_RCGCGPIO)
    SYSCTL->RCGCGPIO = 0x20;
    // allow time for clock to stabilize (SYSCTL_PRGPIO)
    while((SYSCTL->PRGPIO & 0x20) != 0x20){};
    // 2. Unlock GPIOC[3:0], GIOD[7] and GPIOF[0] on TM4C123G (GPIOn->LOCK and GPIOn->CR) NOT USING
		GPIOF->LOCK = 0x4C4F434B;
		GPIOF->CR |= 0x01;
    // 3. Clear AMSEL to disable analog
		GPIOF->AMSEL = 0x00;
    // 4. Config PCTL to select GPIO
		GPIOF->PCTL = 0x0000;
		//or
		//GPIOF->PCTL &= 0xFFF00FFF;
    // 5. Set DIR to 0 for input, 1 for output
    GPIOF->DIR = 0x0E; // PF3,PF2,PF1 for Output
    // 6. Enable AFSEL bits to 1
		GPIOF->AFSEL = 0x00;
    // 7. Set PUR bits to 1 to enable internal pull-up
		GPIOF->PUR = 0x11;
    // 8. Set DEN bits to 1 to enable data pins
    GPIOF->DEN = 0x1F; // Enable digital pin on PF3,PF2,PF1
}

void Delay(int t)
{
    volatile int i, j;
    for (i = 0; i < t; i++)
        for (j = 0; j < 3180; j++)
            {};
}