#include <stdint.h>
#include "tm4c123gh6pm.h"
//#include "emp_type.h"
#include "string.h"
#define SYSTICK_RELOAD_VALUE 80000 // 5 mS
#define NVIC_INT_CTRL_PEND_SYST   0x04000000  // Pend a systick int
#define NVIC_INT_CTRL_UNPEND_SYST 0x02000000  // Unpend a systick int
#define SYSTICK_PRIORITY    0x7E

static int a;

void SysTick_Handler(void)
/*****************************************************************************
*   Function : See module specification (.h-file).
*****************************************************************************/
{
  // Hardware clears systick int reguest
a++;
  // Do your stuff
}

void enable_global_int()
{
  // enable interrupts.
  __asm("cpsie i");
}

void disable_global_int()
{
  // disable interrupts.
  __asm("cpsid i");
}


void SysTickInit()
{

  // Disable systick timer
  NVIC_ST_CTRL_R &= ~(NVIC_ST_CTRL_ENABLE);

  // Set current systick counter to reload value
  NVIC_ST_CURRENT_R = SYSTICK_RELOAD_VALUE;
  // Set Reload value, Systick reload register
  NVIC_ST_RELOAD_R = SYSTICK_RELOAD_VALUE;

  // NVIC systick setup, vector number 15
  // Clear pending systick interrupt request
  NVIC_INT_CTRL_R |= NVIC_INT_CTRL_UNPEND_SYST;

  // Set systick priority to 0x10, first clear then set.
  NVIC_SYS_PRI3_R &= ~(NVIC_SYS_PRI3_TICK_M);
  NVIC_SYS_PRI3_R |= (NVIC_SYS_PRI3_TICK_M & (SYSTICK_PRIORITY<<NVIC_SYS_PRI3_TICK_S));

  // Select systick clock source, Use core clock
  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_CLK_SRC;

  // Enable systick interrupt
  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_INTEN;

  // Enable and start timer
  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
}


int main(void)
{
	enable_global_int();
	int dummy;
	SYSCTL_RCGC2_R = SYSCTL_RCGC2_GPIOF;

	dummy = SYSCTL_RCGC2_R;

	GPIO_PORTF_DIR_R=0x0E; //DDRA

	GPIO_PORTF_DEN_R=0x1E; //like PORTA

	GPIO_PORTF_LOCK_R = 0x4C4F434B;  // Unlock the CR register
	GPIO_PORTF_CR_R   = 0xFF;        // Enable overwrite of PUR to FP0

	GPIO_PORTF_PUR_R=0x10; //PULL UP HERE
	int i=0;
	SysTickInit();
	int aa,or,sw,n;
	aa=or=sw=n=0;
	GPIO_PORTF_DATA_R=0x00;
	while(1)
	{
		if(n==2)or=1;

		if (GPIO_PORTF_DATA_R & 0x10)
		{
			while(aa==1) //auto mode
			{
				n=0; //set buttons clicked to 0
				while(1)
				{
					  if (n>0)aa=0; //if button is pushed, it exits auto mode

					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE; //enables systick

					  if (a==40) //200 ms
					  {
						  if(GPIO_PORTF_DATA_R!=0x0E) //if it is at the end, goes to 0x00;
						  {
							  GPIO_PORTF_DATA_R=0x00;
						  }
						  else
						  {
							  GPIO_PORTF_DATA_R++; //next diode
						  }

						  a=0; //sets the systick counts to 0
						  break; //next loop of while, 200 ms has elapsed
					  }
				}
			}
			while(or==1)
			{

			}
		}
		else
		{
			n++;
			//GPIO_PORTF_DATA_R|=0x01;
			//GPIO_PORTF_DATA_R++;
			//GPIO_PORTF_DATA_R&=~(0x01);
			switch (i)
			{
			case 0:
				GPIO_PORTF_DATA_R=0x00;
				i++;

				while(a!=200)
				{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
				}

			break;

			case 1:
				GPIO_PORTF_DATA_R=0x02;
				while(a!=200)
								{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
								}
			break;

			case 2:
				GPIO_PORTF_DATA_R=0x04;
				while(a!=200)
								{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
								}
			break;

			case 3:
				GPIO_PORTF_DATA_R=0x06;
				while(a!=200)
								{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
								}
			break;

			case 4:
				GPIO_PORTF_DATA_R=0x08;
				while(a!=200)
								{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
								}
			break;

			case 5:
				GPIO_PORTF_DATA_R=0x0A;
				while(a!=200)
								{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
								}
			break;

			case 6:
				GPIO_PORTF_DATA_R=0x0C;
				while(a!=200)
								{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
								}
			break;

			case 7:
				GPIO_PORTF_DATA_R=0x0E;
				while(a!=200)
								{
					  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
								}
				i=0;
			break;
			}
			if (i!=0)i++;

		}
	}
	return(0);
}