import time
import rp2
from machine import Pin
@rp2.asm_pio(set_init=(rp2.PIO.OUT_LOW, rp2.PIO.OUT_LOW))
def blink():
    wrap_target()
    set(pins, 0b01)   [31]


    wrap()
sm = rp2.StateMachine(0, blink, freq=2000, set_base=Pin(5) )
sm.active(1)