"""
Pico micropython example, blinking leds
when a button is clicked.
Demonstrates using lightsleep() for
low power usage.
Should work on pico and pico2.
- Nick Parlante

This code is placed in the public domain,
free for any use.

Button is on 17
LED is on 16

 xVsysG3.3 1918G1716
 -------------------
u|
 -------------------
           1213G1415
"""

import machine
from machine import Pin
import utime

# Pins held high, ground to activate
BUTTON = 17
DEV = 18

LED1 = 25
LED2 = 16

# True = output some text per button click
# showing that serial output works
PRINT = False

# Use pull-up .. avoid pull_down errata, ground on click,
# so .value() == 0 -> clicked
button = Pin(BUTTON, Pin.IN, Pin.PULL_UP)  
dev_mode = Pin(DEV, Pin.IN, Pin.PULL_UP)

led1 = Pin(LED1, Pin.OUT)
led2 = Pin(LED2, Pin.OUT)
led1.low()
led2.low()

# Count number of clicks to relay in printing
click_count = 0


def blink_led(led, delay_ms):
    "Blink led twice with given delay."
    for i in range(2):
        led.high()
        utime.sleep_ms(delay_ms)
        led.low()
        utime.sleep_ms(delay_ms)


# lightsleep for the given ms, unless dev mode,
# in which use regular utime sleep
def dev_sleep(ms):
    "Sleep, either regular or lightsleep() depending on dev mode."
    if dev_mode.value() == 0:
        utime.sleep_ms(ms)
    else:
        machine.lightsleep(ms)
        

# Fast blink at boot
blink_led(led1, 50)

if PRINT:
    print('start low power blink ticks: {}'.format(utime.ticks_ms()))


while True:
    # If button is clicked -> do something,
    if button.value() == 0:
        blink_led(led1, 100)
        blink_led(led2, 100)
        click_count += 1
        if PRINT:
            print('button click: {} ticks: {}'.format(click_count, utime.ticks_ms()))

    # Sleep 50 ms, then loop around to check again.
    # 50 ms is fast enough to detect clicks while saving significant power.
    dev_sleep(50)