#define LED_OUTPUT 8 
#define BUTTON_INPUT 9

unsigned char LED_STATE_OFF=0;
unsigned char LED_STATE_ON=1;
unsigned char buttonState = 0;      // Variable to store the button state
unsigned int lastButtonState = 0;  // Variable to store the last button state
unsigned char led_Output = LOW;       // Variable to store the LED state  //COUNTER FOR 10MS  
unsigned char PushSwitchDebCount=0;/*debounce counter for input switch*/
static unsigned int counterfor10ms=0;
static unsigned int counterfor100ms=0;
unsigned char  LED_Current_State=0;


void Task_10ms(void);
void LED_on(void);
void LED_off(void);
void LED_debounce(void);
void LED_state_manager(void);
void timer_init();
void Task_100ms(void);


ISR(TIMER1_COMPA_vect)   // ISR
{
  TCNT1=0;
  counterfor10ms++;
  counterfor100ms++;
}

void timer_init()        //TIMER INITIALIZATION
{
  cli();
  TCCR1A=0;
  TCCR1B=0;
  TCCR1B|=B00000100;  //PSC=256
  TIMSK1|=B00000010;  // INITIALLY SETTING TIM A,B BITS=0
  OCR1A=62;  /* 625 - 10ms, 62 - 1ms*/
  sei();  
}

void pin_init()    // digital pins
{
   pinMode(LED_OUTPUT, OUTPUT);
   pinMode(BUTTON_INPUT, INPUT);
 
}
void setup() /* This function will execute only 1 time*/
{  
  timer_init();
 pin_init();
  LED_State_Init();
}
/* Do not modify*/
void loop()
{
  // put your main code here, to run repeatedly:
  Task_10ms();
  Task_100ms();
}

void Task_10ms()
{
  if(counterfor10ms>=10)
  {
    Read_button();
   counterfor10ms=0;
  }
}

void Task_100ms()
{
  if(counterfor100ms>=100)
  {
    LED_state_manager();
   counterfor100ms=0;
  }
}

void LED_State_Init(void)
{
  led_Output = LOW;
  digitalWrite(LED_OUTPUT, led_Output);
   LED_Current_State =0;

  
}
void Read_button(void)
{
   buttonState = digitalRead(BUTTON_INPUT);
   //Serial.println(buttonState);
}

void LED_state_manager(void)
{
 
 LED_off();
}


void LED_off(void)
{
  if(LED_Current_State==0 && HIGH==buttonState)
  {
    digitalWrite(LED_OUTPUT, led_Output);
    LED_debounce();
  }
}

void LED_debounce(void)
{
    if(PushSwitchDebCount++>0)
    {
      Serial.println(PushSwitchDebCount );
              PushSwitchDebCount = 0;

                if(LOW == led_Output)
                {
                  led_Output = HIGH;
                 digitalWrite(LED_OUTPUT, led_Output);
                 LED_Current_State=LED_STATE_OFF;
                  LED_on();
                }
                else if(HIGH == led_Output)
                {
                  led_Output = LOW;
                 digitalWrite(LED_OUTPUT, led_Output);
                LED_Current_State=LED_STATE_ON;
                  LED_off();
                }
                else
                {
                  /* do nothing*/
                }
     }
            else
            {
              /* do nothing*/
            }
}

void LED_on(void)
{
    
  if(LED_Current_State==1 && buttonState ==LOW)
  {
    digitalWrite(LED_OUTPUT, led_Output);
    LED_debounce();
  }
}

// #define BUTTON_INPUT  9  // Pin connected to the push button
// #define LED_OUTPUT  8     // Pin connected to the LED
 
// unsigned char buttonState = 0;      // Variable to store the button state
// unsigned char lastButtonState = 0;  // Variable to store the last button state
// unsigned char led_Output = LOW;       // Variable to store the LED state
// unsigned char counterfor100ms=0;   //COUNTER FOR 10MS  
// unsigned char PushSwitchDebCount=0; /*debounce counter for input switch*/
// unsigned char counterfor10ms;
 
// void LED_State_Init(void);
// void LED_State_Manager(void);
 
// void Task_10ms(void);
// void Task_100ms(void);
 
// enum State_LED
// {
//   LED_STATE_OFF,
//   LED_STATE_DEBOUNCE,
//   LED_STATE_ON
// } ;
// static State_LED LED_Current_State;
// static State_LED LED_Previous_State;
 
// /* Do not modify*/
// ISR(TIMER1_COMPA_vect)   // ISR
// {
//   TCNT1=0;
//   counterfor10ms++;
//   counterfor100ms++;
// }
// /* Do not modify*/
// void timer_init()        //TIMER INITIALIZATION
// {
//   cli();
//   TCCR1A=0;
//   TCCR1B=0;
//   TCCR1B|=B00000100;  //PSC=256
//   TIMSK1|=B00000010;  // INITIALLY SETTING TIM A,B BITS=0
//   OCR1A=625;  /* 625 - 10ms, 62 - 1ms*/
//   sei();  
// }
// /* Do not modify*/
// void digitalpin_init()    // digital pins
// {
//    pinMode(LED_OUTPUT, OUTPUT);
//    pinMode(BUTTON_INPUT, INPUT);
 
// }
// /* Do not modify*/
// void setup() /* This function will execute only 1 time*/
// {  
//   timer_init();
//   digitalpin_init();
//   LED_State_Init();
//   Serial.begin(9600);
// }
// /* Do not modify*/
// void loop()
// {
//   // put your main code here, to run repeatedly:
//   Task_10ms();
//   Task_100ms();
// }
 
// void Task_10ms(void)
// {
//   if(counterfor10ms>=1) /* enters for every 10ms*/
//   {
//     /*task_pushbutton();*/
//     LED_State_Manager();
//     counterfor10ms=0;
//   }
 
// }
 
 
// void Task_100ms(void)
// {
// }
 
 
// /* Start to write your logic from here*/
 
// /* Led state machine init function*/
// void LED_State_Init(void)
// {
//   led_Output = LOW;
//   digitalWrite(LED_OUTPUT, led_Output);
//   LED_Current_State = LED_STATE_OFF;
// }
 
// /* State machine function for LED_STATE Manager. Executes every 10ms*/
// void LED_State_Manager(void)
// {
//   buttonState = digitalRead(BUTTON_INPUT);
//   switch(LED_Current_State)
//   {
//     case LED_STATE_OFF:
//             if(HIGH == buttonState)
//             {
//               LED_Current_State = LED_STATE_DEBOUNCE;
//             }
//             break;
//     case LED_STATE_DEBOUNCE:
//             if(PushSwitchDebCount++>4)
//             {
              
//               PushSwitchDebCount = 0;
              
//                 if(LOW == led_Output)
//                 {
//                   led_Output = HIGH;
//                   digitalWrite(LED_OUTPUT, led_Output);
//                   LED_Current_State = LED_STATE_ON;
//                 }
//                 else if(HIGH == led_Output)
//                 {
//                   led_Output = LOW;
//                   digitalWrite(LED_OUTPUT, led_Output);
//                   LED_Current_State = LED_STATE_OFF;
//                 }
//                 else
//                 {
//                   /* do nothing*/
//                 }
//             }
//             else
//             {
//               /* do nothing*/
//             }
//             break;
//     case LED_STATE_ON:
//             if(LOW == buttonState)
//             {
//               LED_Current_State = LED_STATE_DEBOUNCE;
//             }
//             break;
 
 
//   }
// }