02_AVR_IO_Config_LED1.c

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

int main()
{
    DDRC = 0xff;           // Configure PORTC as output

    while(1)
    {
        PORTC = 0xff;        // Turn ON all the Leds connected to PORTC
        _delay_ms(100);      // Wait for some time
        PORTC = 0x00;        // Turn OFF all the Leds connected to PORTC
        _delay_ms(100);      // Wait for some time
    }
    return 0;
}