# https://dev.to/blues/a-practical-look-at-pio-on-the-raspberry-pi-pico-50j8

import time
import rp2
from machine import Pin


#@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT)
@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)  
def set_pin():
    pull()
    mov(x, osr)
    label("loop_2")
    set(pins, 1).delay(1)
    set(pins, 0)
    jmp(x_dec, "loop_2")
    set(pins, 1)

@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)  
def clear_pin():
    pull()
    set(pins, 0)

sm0 = rp2.StateMachine(0, set_pin, freq=10_000, set_base=Pin(16))
sm1 = rp2.StateMachine(1, clear_pin, freq=10_000, set_base=Pin(16))

sm0.active(1)
sm1.active(1)

while(1):
    sm0.put(30)
    time.sleep(0.1)
    sm1.put(1)
    time.sleep(1)