#include <stdint.h>
#include "tm4c123gh6pm.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

/*
	0x02 - red
	0x04 - blue
	0x06 - magenta (rozowy)
	0x08 - green
	0x0A - yellow
	0x0C - cyan
	0x0E - white
*/

volatile static int tim, zd;
//for couting the interval between button clicks
static int a;
//a - iteration of timer, one is 5 ms
static int aa,or,sw,n,b,xd,i;
//aa - auto; or - reverse; sw - normal; n - clicks;
//b - needed for clicking; xd - not used; i - for iteration
static int vibr; //for the button vibration

void SwitchM(void)
{
	switch (i)
	            {
	            case 0:
	                GPIO_PORTF_DATA_R=0x00;
	                i=7;
	                break;
	            case 1:
	                GPIO_PORTF_DATA_R=0x08;
	                i--;
	                break;
	            case 2:
	                GPIO_PORTF_DATA_R=0x04;
	                i--;
	                break;
	            case 3:
	                GPIO_PORTF_DATA_R=0x0C;
	                i--;
	                break;
	            case 4:
	                GPIO_PORTF_DATA_R=0x02;
	                i--;
	                break;
	            case 5:
	                GPIO_PORTF_DATA_R=0x0A;
	                i--;
	                break;
	            case 6:
	                GPIO_PORTF_DATA_R=0x06;
	                i--;
	                break;
	            case 7:
	                GPIO_PORTF_DATA_R=0x0E;
	                i--;
	                break;
	            default:
	            	;
	            }

}
void SwitchP(void)
{
	switch (i)
		            {
					case 0:
						GPIO_PORTF_DATA_R=0x00;
						i++;
						break;
					case 1:
						GPIO_PORTF_DATA_R=0x08;
						i++;
						break;
					case 2:
						GPIO_PORTF_DATA_R=0x04;
						i++;
						break;
					case 3:
						GPIO_PORTF_DATA_R=0x0C;
						i++;
						break;
					case 4:
						GPIO_PORTF_DATA_R=0x02;
						i++;
						break;
					case 5:
						GPIO_PORTF_DATA_R=0x0A;
						i++;
						break;
					case 6:
						GPIO_PORTF_DATA_R=0x06;
						i++;
						break;
					case 7:
						GPIO_PORTF_DATA_R=0x0E;
						i=0;
		                break;
					default:
						;
		            }

}

void SysTick_Handler(void) //interrupt for systick
{

a++; //iteration

if(zd==1)
{
	tim++;
}

if(a>20 && zd==0)vibr=1; //vibration

if(a>=400 && zd==0) //auto mode
{
	aa=1;
	sw=0;
	n=0;
	a=0;
}

if(aa==1 && a>50 && or==0) //auto mode next, switching lights
{
		            //if (i!=0 && i!=7)i++;
SwitchP();
	            if(n>=1)
	            	{
						aa=0;
						a=0;
	            	}
				a=0;
}
if(aa==1 && a>50 && or==1) //auto mode next, switching lights
{
SwitchM();
	            if(n>=1)
	            	{
						aa=0;
						a=0;
	            	}
				a=0;
}
if(n>2)n=0;

}

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

void disable_global_int() //for disabling, but not used
{
  // disable interrupts.
  __asm("cpsid i");
}


void SysTickInit() //initlaizioatn of systick
{

  // 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;
}

void Reset() //resetting systick
{
	  // 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;
	  NVIC_ST_RELOAD_R = SYSTICK_RELOAD_VALUE;
	  NVIC_INT_CTRL_R |= NVIC_INT_CTRL_UNPEND_SYST;
	  NVIC_ST_CTRL_R |= NVIC_ST_CTRL_ENABLE;
}
void Off() //turning off systick
{
	// Disable systick timer
	NVIC_ST_CTRL_R &= ~(NVIC_ST_CTRL_ENABLE);
}

int main(void)
{
	enable_global_int(); //enabling functions, and stuff
	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

	//setting some variables at 0, initial values
	aa=or=sw=n=b=xd=i=a=tim=xd=0;

	//setting iintial values for data_r, just in case
	GPIO_PORTF_DATA_R=0x00;
	// let the normal mode be at the begining
	sw=1;

	//initalization of systick, then turning off
	SysTickInit();
	Off();
	//vibartion
	vibr=1;

	while(1)
	{



		if (GPIO_PORTF_DATA_R & 0x10) //not pushing!
		{
			if(aa==0 && zd==0) //if there is no automode, it doesnt count to anything
			{

					Off();
					a=0;
			}

			if(zd==0 && aa==0 && n==1 && b==1)
				{
				Off();
				Reset();
				zd=1;
				}

			//activating switfh
			if(aa==0)sw=1;

			//activing order reverse
			if(xd==1 && or==1)
			{
				or=0;
				xd=0;
			}
			if(xd==1 && or==0)
			{
				or=1;
				xd=0;
			}

			//switch in work
			if (sw==1 && b==1 && or==0 && vibr ==1)
			{

				SwitchP();
			}
			//reverse in action
			if (sw==1 && or==1 && b==1 && vibr==1)
			{
				SwitchM();
				//if (i!=0 && i!=7)i--;
			}
			b=0;
		}
		else //pushing!
		{
			if(b==0)
			{
				n++;
				if(n==2 && tim<100 && zd==1) //500 ms
				{
					xd=1;
					zd=n=a=tim=0;
				}
				else if(n==2 && zd==1)
				{
					zd=n=a=tim=0;
				}
					b=1;
					Reset();
			}
			vibr=0;
			while(vibr==0); //so the vibration would not have effect, it waits
		}
	}
	return(0);
}