// Programmbeschreibung: LED 5 und LED 6 folgen den Zuständen an den Jumpern 1 und 2

#include <avr/io.h>
#include <stdint.h>

int main (void)
{
	DDRA |= (1 << DDA4) | (1 << DDA5) | (1 << DDA6) | (1 << DDA7);  // Ausgänge
	DDRA &= ~((1 << DDA1) | (1 << DDA2)); 				//Eingänge
	
	PORTA |= (1<<PA1) | (1<<PA2); 	// Pullup Widerstände aktivieren
	
	PORTA |= (1<<PA6)|(1<<PA7); 	//LED 5 und 6 an

	while (1)
	{
		if ( !(PINA & (1<<PINA1))) PORTA |= (1<<PA4); 	// LED 5 ein
		
		if ( PINA & (1<<PINA1)) PORTA &= ~(1<<PA4); 	// LED 5 aus
	
		if ( !(PINA & (1<<PINA2))) PORTA |= (1<<PA5);	// LED 6 ein
		
		if ( PINA & (1<<PINA2)) PORTA &= ~(1<<PA5);	// LED 6 aus
	}	
}

------------------------------------------------------------------------------------
Komplette Compilermeldung (AVR-GCC):


> "make.exe" all

-------- begin --------
avr-gcc (GCC) 3.4.3
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


Size before:
main.elf  :
section           size      addr
.text             2754         0
.data                0   8388704
.bss                 0   8388704
.noinit              0   8388704
.eeprom              0   8454144
.debug_aranges      20         0
.debug_pubnames     27         0
.debug_info        236         0
.debug_abbrev       54         0
.debug_line        207         0
Total             3298


AVR Memory Usage:
-----------------
Device: attiny26
Program:    2754 bytes (134.5% Full)
(.text + .data + .bootloader)

Data:          0 bytes (0.0% Full)
(.data + .bss + .noinit)

Size after:
main.elf  :
section           size      addr
.text             2754         0
.data                0   8388704
.bss                 0   8388704
.noinit              0   8388704
.eeprom              0   8454144
.debug_aranges      20         0
.debug_pubnames     27         0
.debug_info        236         0
.debug_abbrev       54         0
.debug_line        207         0
Total             3298


AVR Memory Usage:
-----------------
Device: attiny26
Program:    2754 bytes (134.5% Full)
(.text + .data + .bootloader)

Data:          0 bytes (0.0% Full)
(.data + .bss + .noinit)

-------- end --------

> Process Exit Code: 0