Seven Segment Display

/*

 * seven_segment.c

 *

 *  Created on: May 25, 2015

 *      Author: Tanzila Islam

 *  atmega328p driving a seven segment common cathode display. seven segment A-G is connected to portd 0-6 in order

 *    G F E D C B A

 *   0 ->  0 1 1 1 1 1 1

 *   1 -> 0 0 0 0 1 1 0

 *   2 -> 1 0 1 1 0 1 1

 *   3 -> 1 0 0 1 1 1 1

 *   4 -> 1 1 0 0 1 1 0

 *   5 -> 1 1 0 1 1 0 1

 *   6 -> 1 1 1 1 1 0 1

 * 7 -> 0 0 0 0 1 1 1

 * 8 -> 1 1 1 1 1 1 1

 * 9 -> 1 1 0 1 1 1 1

 * A -> 1 1 1 0 1 1 1

 * b -> 1 1 1 1 1 0 0

 * C -> 0 1 1 1 0 0 1

 *   d -> 1 0 1 1 1 1 0

 *   E -> 1 1 1 1 0 0 1

 *   F -> 1 1 1 0 0 0 1

 *

 *      _A

 *  F|_|B

 *  E|_|C

 *      D

 */


#include <avr/io.h>

#include <avr/delay.h>


#define F_CPU 16000000UL


const uint8_t segment_look_up[] ={

  0b00111111,//0

  0b00000110,//1

  0b01011011,//2

  0b01001111,//3

  0b01100110,//4

  0b01101101,//5

  0b01111101,//6

  0b00000111,//7

  0b01111111,//8

  0b01101111,//9

  0b01110111,//A

  0b01111100,//b

  0b00111001,//C

  0b01011110,//d

  0b01111001,//E

  0b01110001 //F

};


int main()

{

 DDRD = 0b01111111;

 //Following will have same effect

 //DDRD |= (1<<DDD6)|(1<<DDD5)|(1<<DDD4)|(1<<DDD3)|(1<<DDD2)|(1<<DDD1)|(1<<DDD0);

 //DDRD |= _BV(DDD6)|_BV(DDD5)|_BV(DDD4)|_BV(DDD3)|_BV(DDD2)|_BV(DDD1)|_BV(DDD0);

 PORTD = 0x00;

 uint8_t i;

 while(1)

 {

  for(i=0;i<15;i++)

  {

   PORTD= segment_look_up[i];

   _delay_ms(2000);

  }


 }


}