// Include C Libriaries

#include <avr/io.h>
#include <util/delay.h>
#include <stdio.h>

// Ziffern --> Segmente aktivieren

#define zifferNull		PORTA = (1<<PA0) | (1<<PA1); PORTD = (1<<PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5)
#define zifferEins		PORTD = (1<<PD3) | (1<<PD4); PORTA = 0;
#define zifferZwei		PORTD = (1<<PD5) | (1<<PD4) | (1<<PD2) | (1<<PD1); PORTA = (1<<PA0)
#define zifferDrei		PORTD = (1<<PD5) | (1<<PD4) | (1<<PD3) | (1<<PD2) | (1<<PD1); PORTA = 0;
#define zifferVier		PORTD = (1<<PD4) | (1<<PD3) | (1<<PD1); PORTA = (1<<PA1)
#define zifferFuenf		PORTD = (1<<PD5) | (1<<PD3) | (1<<PD2) | (1<<PD1); PORTA = (1<<PA1)
#define zifferSechs		PORTD = (1<<PD5) | (1<<PD3) | (1<<PD2) | (1<<PD1); PORTA = (1<<PA1) | (1<<PA0)
#define zifferSieben	PORTD = (1<<PD3) | (1<<PD4) | (1<<PD5); PORTA = 0;
#define zifferAcht		PORTD = (1<<PD1) | (1<<PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5); PORTA = (1<<PA0) | (1<<PA1)
#define zifferNeun		PORTD = (1<<PD1) | (1<<PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5); PORTA = (1<<PA1)
#define zifferAus		PORTA = 0; PORTD = 0

void displayZahl(uint16_t zahl, uint16_t dauer);
void aktiviereSegmente(uint8_t ziffer);

int main(void)
{
	// Variablen
	uint16_t zahl;
	uint16_t dauer;
	dauer = 300;

	// Ports initialisieren
	DDRB = (1<<PB4) | (1<<PB5) | (1<<PB6) | (1<<PB7);
	DDRA = (1<<PA0) | (1<<PA1);
	DDRD = (1<<PD0) | (1<<PD1) | (1<<PD2) | (1<<PD3) | (1<<PD4) | (1<<PD5);

	for (zahl = 1; zahl <= 9999; zahl++)
	{
		displayZahl(zahl, dauer);
	}

	while(1)
	{ }
}

void displayZahl(uint16_t zahl, uint16_t dauer)
{
	// Variablen
	uint8_t ziffer1;
	uint8_t ziffer2;
	uint8_t ziffer3;
	uint8_t ziffer4;
	
	uint16_t count;

	// Zahl in Ziffern zerlegen

	// Einser
	ziffer4 = zahl % 10;
	zahl = zahl / 10;

	// Zehner
	if (zahl > 0) {
		ziffer3 = zahl % 10; }
	else {
		ziffer3 = 10; }
	zahl = zahl / 10;

	// Hunderter
	if (zahl > 0) {
		ziffer2 = zahl % 10; }
	else {
		ziffer2 = 10; }
	zahl = zahl / 10;

	// Tausender
	if (zahl > 0) {
		ziffer1 = zahl % 10; }
	else {
		ziffer1 = 10; }
	zahl = zahl / 10;

	for (count = 1; count <= dauer; count++)
	{
		// alle Ziffern und Segmente ausschalten
		PORTA = 0;
		PORTB = 0;
		PORTD = 0;

		// Tausender
		PORTB = 0;
		aktiviereSegmente(ziffer1);
		PORTB = (1<<7);					// 3 + 4

		_delay_us(200);

		// Hunderter
		PORTB = 0;
		aktiviereSegmente(ziffer2);
		PORTB = (1<<6);					// 3 + 3

		_delay_us(200);

		// Zehner
		PORTB = 0;
		aktiviereSegmente(ziffer3);
		PORTB = (1<<5);					// 3 + 2

		_delay_us(200);

		// Einser
		PORTB = 0;
		aktiviereSegmente(ziffer4);
		PORTB = (1<<4);					// 3 + 1

		_delay_us(200);
	}
	
	// alle Ziffern und Segmente ausschalten
	PORTA = 0;
	PORTB = 0;
	PORTD = 0;
}

void aktiviereSegmente(uint8_t ziffer)
{
	switch (ziffer)
	{
		case 0: zifferNull; break;
		case 1: zifferEins; break;
		case 2: zifferZwei; break;
		case 3: zifferDrei; break;
		case 4: zifferVier; break;
		case 5: zifferFuenf; break;
		case 6: zifferSechs; break;
		case 7: zifferSieben; break;
		case 8: zifferAcht; break;
		case 9: zifferNeun; break;
		case 10: zifferAus; break;
	}
}