QUERY · ISSUE

rp2: Can't wake from lightsleep with Pin IRQ

openby peterhinchopened 2021-03-15updated 2026-03-24

port-rp2

On a pin change this code sample toggles the LED but never outputs "got here".

from machine import Pin, lightsleep
p25 = Pin(25, Pin.OUT)
p0 = Pin(0, Pin.IN, Pin.PULL_UP)
def foo(_):
    p25(not p25())  # Toggle the LED

p0.irq(foo, trigger=Pin.IRQ_FALLING)
while True:
    lightsleep()
    print('Got here')

The docs indicate that to fix this, the IRQ should be instantiated with wake=machine.SLEEP. Unfortunately this constant does not exist.

CANDIDATE · ISSUE

RP2350 / Pico 2 machine.lightsleep not working correctly

openby geerlingguyopened 2024-08-08updated 2025-03-03

bugport-rp2

Port, board and/or hardware

Pico 2 / RP2350

MicroPython version

MicroPython v1.24.0-preview.201.g269a0e0e1 on 2024-08-09; Raspberry Pi Pico2 with RP2350

Reproduction

Install latest Firmware from https://micropython.org/download/RPI_PICO2/
Implement machine.lightsleep(5000) in your code
Run code.

Expected behaviour

Expected Pico 2 to enter lightsleep mode for 5 seconds, then continue to next bit of code.

Observed behaviour

lightsleep is maybe entered for a cycle or so, but code carries on and never stops executing for any time value I enter for lightsleep.

Additional Information

Complete code example:

# Lightsleep MicroPython example.
from machine import Pin
import time
led = Pin(25, Pin.OUT)

while True:
    led.toggle()
    time.sleep_ms(5000)
    led.toggle()
    machine.lightsleep(5000)

Code of Conduct

Yes, I agree