/*
This is a simple library for displaying two digit numbers on two seven segment displays. Pin connections are as follows:
a = 1
b = 2
c = 3
d = 4
e = 5
f = 6
g = 7
*/
#define DisplayRegister DDRD
#define DisplayPort PORTD
#define DisplaySelectRegister DDRB
#define DisplaySelect PORTB
#define Display2 1
#define Display1 2
#define F_CPU        1000000
#include <util/delay.h>
void DisplayInit()
{
	DisplayRegister |= (1<<1); 
	DisplayRegister |= (1<<2);
	DisplayRegister |= (1<<3);
	DisplayRegister |= (1<<4);
	DisplayRegister |= (1<<5);
	DisplayRegister |= (1<<6);
	DisplayRegister |= (1<<7);
    DisplaySelectRegister |= (1<<Display1); //Set Display1 pin as output
    DisplaySelectRegister |= (1<<Display2); //Set Display2 pin as output	
}
void show(int num)
{
    if (num == 9)
    {
        DisplayPort = 0b11100110; //Set a, b, c, f, and g high 
    }
    if (num == 8)
    {
        DisplayPort = 0b11111110; //Set a, b, c, d, e, f, and g high
    }
    if (num == 7)
    {
        DisplayPort = 0b11100000; //Set a, b, and c high
    }
    if (num == 6)
    {
        DisplayPort = 0b10111110; //Set a, c, d, e, f, and g high
    }
    if (num == 5)
    {
        DisplayPort = 0b10110110; //Set a, c, d, and f high
    }
    if (num == 4)
    {
        DisplayPort = 0b01100110; //Set b, c, f, and g high
    }
    if (num == 3)
    {
        DisplayPort = 0b11110010; //Set a, b, c, d, and g high 
    }
    if (num == 2)
    {
        DisplayPort = 0b11011010; //Set a, b, d, e, and g high
    }
    if (num == 1)
    {
        DisplayPort = 0b01100000; // Set b and c high
    }
    if (num == 0)
    {
        DisplayPort = 0b11111100; // Set a, b, c, d, e, and f high
    }
}
void display(int number)
{
    int FirstDigit, SecondDigit;
    FirstDigit = (number/10)%10;
    SecondDigit = (number%10);
	
    for (int i = 0; i <= 9; i++)
    {
       
        if (i == FirstDigit)
        {
            //Disable display #2
            DisplaySelect &= ~(1<<Display2);
            //Enable display #1
            DisplaySelect |= (1<<Display1);
            show(i);
			_delay_ms(4);
			DisplaySelect &= ~(1<<Display1);
        }
        if (i == SecondDigit)
        {   
            //Disable display #1
            DisplaySelect &= ~(1<<Display1);
            //Enable display #2
            DisplaySelect |= (1<<Display2); 
            show(i);
			_delay_ms(4);
			DisplaySelect &= ~(1<<Display2);
        }
       
    } 
}