blinking of led using arr

#include <avr/io.h>
#include<util/delay.h>
unsigned char arr[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
void main()
{
 int i;
    while(1)
 {
  DDRA=0XFF;
 for(i=0;i<=7;i++)
  {
       PORTA=arr[i];
  _delay_ms(1000);
 
 } 
}
}

 

 

 

In this we are taking..

 unsigned char arr[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};

means this is pin no in hex form.

Ex-

0B00000001= means PA0 of PORTA and in hex form this is 0x01.

0B00000010= means PA1 of PORTA and in hex form this is 0x02.

0B00000100= means PA2 of PORTA and in hex form this is 0x04.

0B00001000= means PA3 of PORTA and in hex form this is 0x08.

0B00010000= means PA4 of PORTA and in hex form this is 0x10.

0B00100000= means PA5 of PORTA and in hex form this is 0x20.

0B01000000= means PA6 of PORTA and in hex form this is 0x40.

0B10000000= means PA7 of PORTA and in hex form this is 0x80.

 

and due to 8 Pins so we have to take arr[i] = 0 to 7