"""Pin features demo.

A "Pins" panel appears below the editor while this script runs:

  * Pin 2 (OUT)  — blinks every 200 ms; the indicator follows along.
  * Pin 4 (OUT)  — chases through .on() / .off() / .toggle().
  * Pin 0 (IN)   — click the toggle button in the panel to flip its value.
                   When it goes 0 -> 1 we register an IRQ that toggles pin 2.
  * Pin 13 (PWM) — duty sweeps up and down; the bar shows the live duty cycle.
"""

import time

from machine import Pin, PWM


led_a = Pin(2, Pin.OUT)
led_b = Pin(4, Pin.OUT)
button = Pin(0, Pin.IN, Pin.PULL_UP)
fader = PWM(Pin(13), freq=1000, duty_u16=0)


def on_button(pin):
    print("[irq] button rising edge -> toggling pin 2")
    led_a.toggle()


button.irq(handler=on_button, trigger=Pin.IRQ_RISING)


tick = 0
duty = 0
direction = 1024

while True:
    led_a.value(tick % 2)
    if tick % 4 == 0:
        led_b.on()
    elif tick % 4 == 2:
        led_b.off()

    duty += direction
    if duty >= 65535:
        duty = 65535
        direction = -1024
    elif duty <= 0:
        duty = 0
        direction = 1024
    fader.duty_u16(duty)

    button.value()

    tick += 1
    time.sleep(0.1)