import machine as mc
from utime import sleep, sleep_ms

print("Hello, Pi Pico!")

push_bt = mc.Pin(16, mc.Pin.IN, mc.Pin.PULL_UP)
led = mc.Pin(15, mc.Pin.OUT)

# global value
button_pressed = False

def wait_pin_change(pin):
    # wait for pin to change value
    # it needs to be stable for a continuous 20ms
    cur_value = pin.value()
    active = 0
    while active < 5:
        if pin.value() != cur_value:
            active += 1
        else:
            active = 0
        sleep_ms(1)

# Interrupt Service Routine for Button Pressed Events - with no debounce
def button_pressed(change):
    global button_pressed
    button_pressed = True

# here is how we associate the falling value on the input pin with the callback function
push_bt.irq(handler=button_pressed, trigger=mc.Pin.IRQ_FALLING)

while True:
    if (button_pressed == True):
        print("button_pressed")
        wait_pin_change(push_bt)
        button_pressed = False
        if (led.value() == 1):
            led.off()
        else:
            led.on()
 
    sleep(0.2)