from machine import Pin, PWM
import time

LED_PIN = 15
BTN_PIN = 22

led_pwm = PWM(Pin(LED_PIN))
led_pwm.freq(1000)

button = Pin(BTN_PIN, Pin.IN, Pin.PULL_DOWN)
led_pwm.duty_u16(0)

def mode0():
    while button.value() == 0:
        for i in range(0, 65535):
            led_pwm.duty_u16(i)
            if button.value() == 1:
                mode1()
        for i in range(65535, 0, -1):
            led_pwm.duty_u16(i)
            if button.value() == 1:
                mode1()
                
def mode1():
    led_pwm.duty_u16(32767)
    time.sleep(0.2)
    while button.value() == 0:
        continue
    time.sleep(0.2)
    mode0()

while True:
    mode0()