from machine import Pin
from time import sleep

#=======================#
def giro(x):
  A1.value(int(x[0]))
  B1.value(int(x[1]))
  A2.value(int(x[2]))
  B2.value(int(x[3]))
#=======================#


#================inicio de interrupciones ====================================#
def isrA(pin):
    global cnt
    if (canal_a.value==0):
        cnt =+ 1
        if cnt>3:
            cnt=0
 
def isrB(pin):
    if (canal_b.value==0):
        cnt =- 1
        if cnt<0:
            cnt=0
    
#=============================================================================#


canal_a= Pin(14,Pin.IN)
canal_a.irq(trigger=Pin.IRQ_FALLING,handler=isrA)
canal_b= Pin(12,Pin.IN)
canal_b.irq(trigger=Pin.IRQ_FALLING,handler=isrB)
A1=Pin(0,Pin.OUT)
A2=Pin(2,Pin.OUT)
B1=Pin(1,Pin.OUT)
B2=Pin(15,Pin.OUT)

lista=["0011","0110","1100","1001"]

cnt=0


while(1):
   giro(lista[cnt])