/*

 Knight Rider Lauflicht für Modellauto

*/

#define F_CPU 1200000

#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>

int main(void) {

    DDRB  = (1<<PB4) | (1<<PB2) | (1<<PB1) | (1<<PB0);              // LED Outputs

    // timer 0 init
    // mode 2, CTC, prescaler 1024
    TCCR0A  = (1<<WGM01);
    TCCR0B  = (1<<CS02) | (1<<CS00);
    TIMSK0 |= (1<<OCIE0A);
    OCR0A   = 180;              // setzt die Geschwindigkeit des Lauflichts
    sei();

    while(1) {
        set_sleep_mode(SLEEP_MODE_IDLE);
        sleep_mode();
    }
}

// Timer 0

ISR(TIM0_COMPA_vect) {
    static uint8_t i;
    uint8_t tmp=0;

    i++;
    if (i>5) i=0;
    switch (i) {
       case 0: tmp = 0x10; break;
       case 1: tmp = 0x01; break;
       case 2: tmp = 0x02; break;
       case 3: tmp = 0x04; break;
       case 4: tmp = 0x02; break;
       case 5: tmp = 0x01; break;
    }
    PORTB = ~tmp & 0x1F;
}