// ATtiny85  2 LED Blink time delay 500ms with timer0
#include <avr/io.h>
#define F_CPU 8000000UL
#include <util/delay.h>

//////////////////// timer config insertion

void timer_config()
{
DDRB =0b00010111; // set PB1 as output

 //DDRB =0b00000010; // set only PB1 as output pin
 TCCR0A=0x00;             //Normal mode
 TCCR0B=0x00;
 TCCR0B |= (1<<CS00)|(1<<CS02);   //prescaling with 1024
 TCNT0=0;
}

void tmdel()
{
 unsigned int i=0;
 while(i<=14)   // number of itter is 15 to reach 500 ms time delay
  { 
   while((TIFR & (1 << TOV0) )==0);//Waiting for 0-255 and flag to raise
   TIFR|=(1<<TOV0);      //Clear the flag
   i++;                          //increment by one
  }
}

/////////// timer config insertion


int main(void)
{
   //DDRB |= (1<<PB1);
   // DDRB |= (1<<PB0);
 //DDRB=0b00000011;//pb0 and pb1 as out

   timer_config();

  while (1) 
  {
    PORTB = (1<<PB1);
   // _delay_ms(500);
   tmdel();
    PORTB &= ~(1<<PB1);
   // _delay_ms(500);
   tmdel();
   PORTB = (1<<PB0);
   tmdel();
   // _delay_ms(500);
   PORTB &= ~(1<<PB0);
   tmdel();
  PORTB = (1<<PB2);
tmdel();
   PORTB &= ~(1<<PB2);
tmdel();
   PORTB = (1<<PB4);
tmdel();
   PORTB &= ~(1<<PB4);
tmdel();
     
   
   // _delay_ms(500);

    }
}