// create timings by non blocking loop
#include <avr/io.h>
#define F_CPU 16000000UL  //must be defined prior to delay.h
#include <util/delay.h>
#define A  PORTB7
#define B  PORTB6
#define C  PORTB5
#define MAX 14
void setup(); 
int main(){
	setup(); 
	uint8_t signals[] ={1,2,3};
	static uint8_t n = 0; 
	uint16_t time = 0; 
	const uint16_t countMS = 160;   //magic number found by simulation
									//this number depends on optimization mode!!!
									
	while(1){
		// n = n % sizeof(signals)/sizeof(signals[0]); //periodic by 14
		n = n % 3; // much faster than previous line	
		if (time == countMS){  //
			PORTB = signals[n++]<<5;  //shift bit pattern to correct position			
			time=0;
		}
		time++; 
		
	}
}
void setup(){
  DDRB |= (1<<A)|(1<<B)|(1<<C); 	
}