import time
import machine
from machine import Pin

time.sleep(0.1) # Wait for USB to become ready

leds = [ Pin(i, Pin.OUT) for i in range(4, 12) ]
clk = Pin(0, Pin.IN)
dt = Pin(1, Pin.IN)
sw = Pin(2, Pin.IN)

brojac = 0

def rotation(t):
    global brojac
    if dt.value():
        brojac = (brojac + 1) % 256
    else:
        brojac = (brojac - 1) % 256

def reset(t):
    global brojac
    brojac = 0

def display(br):
    for i in range(8):
        leds[i].value(br & 1)
        br = br >> 1
    
clk.irq(handler=rotation, trigger=Pin.IRQ_FALLING)
sw.irq(handler=reset, trigger=Pin.IRQ_FALLING)

while True:
    display(brojac)
    time.sleep(0.1)