#include <inttypes.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include <stdlib.h>

#include <stdarg.h>
#include <ctype.h>
#include <string.h>

static volatile uint8_t switches;

static void delay(uint16_t us) 
{
    while(us)
    	us--;
}

int main(void)
{
	DDRB = 0xff;	//use all pins on PORT B for output
    DDRC = 0x00;    //use all pins on PORT C for input

	switches = 0;		    //init variable representing the LED state

    while(1)
    {
        // read the state of port C
        switches = PINC;

        // display on port B
        PORTB = switches;
    }
}