Port, board and/or hardware

ESP32_C6_GENERIC, Seeed Studio XIAO ESP32-C6

MicroPython version

MicroPython v1.25.0 on 2025-04-15; ESP32C6 module with ESP32C6

Reproduction

1. Copy the code below into main.py on an ESP32-C6 board.
2. Reset the board.

from machine import Pin, deepsleep
from esp32 import wake_on_ext1, WAKEUP_ALL_LOW 
from time import sleep_ms

BUTTON_PIN = 0  # must be RTC-capable pin.
LED_PIN = 15 # XIAO ESP32-C6 User LED pin, active LOW

sleep_ms(1000) # wait for button to be released

button = Pin(BUTTON_PIN, Pin.IN, Pin.PULL_UP)
led = Pin(LED_PIN, Pin.OUT, value=1)  # active low

def blink_led(period_ms):
    led.value(0)  # turn on LED
    sleep_ms(period_ms)
    led.value(1)  # turn off LED

blink_led(500)

if button.value() == 1:
    wake_on_ext1([button], WAKEUP_ALL_LOW)
    deepsleep()
else:
    print("Button is pressed. Not going to sleep.")
    while True:
        sleep_ms(100)
        blink_led(100)

Expected behaviour

Expected to long-blink the LED once after reset.
If pin GPIO 0 is briefly connected to GND you should get another single blink.

Observed behaviour

The LED long-blinks once, then again after 1 second, then flashes rapidly, indicating that pin 0 is stuck LOW.

Interrupting with mpremote repl you can examine the state of button:

>>> button.value()
0
>>>

Additional Information

If you use esp32.WAKEUP_ANY_HIGH (and Pin.PULL_DOWN) it works correctly.

Also, wake_on_ext0(button, WAKEUP_ALL_LOW) doesn't wake up on the GPIO going LOW.

Code of Conduct

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