QUERY · ISSUE

ESP32: RTC no function 'wake_on_ext0'

openby linuskohleropened 2018-09-15updated 2019-05-21

port-esp32

Hello,
this question may already be answered, but I can't find any working version for me.

I'm trying to use an interrupt-Pin on my newly flashed ESP32.
I tried with multiple snippets I found online (e.g. this or this), but it always breaks down to the point that RTC doesn't have the attribute now() or wake_on_ext0.

AttributeError: 'RTC' object has no attribute 'wake_on_ext0'

Is there anything I'm doing wrong? I'm using a flashed ESP32 wroom and the latest binaries from here (esp32-20180915-v1.9.4-528-gabb536da4.bin).

Thanks for your help!

CANDIDATE · PULL REQUEST

esp32/modesp32: Fix access to ext0_pin only if defined.

mergedby meirarmonopened 2025-06-16updated 2025-06-17

board-definition

In different functions machine_rtc_config.ext0_pin is accessed where SOC_PM_SUPPORT_EXT0_WAKEUP is not defined, fix that.

Summary

Previous PRs (https://github.com/micropython/micropython/pull/17397#) wrapped defining the ext0 pins only if SOC_PM_SUPPORT_EXT0_WAKEUP, but some of the spots were missed. This PR fixes that.

Testing

Compiled for ESP32_GENERIC_C6

Assessment

S Sonnet · high

Both concern ESP32 ext0 wakeup functionality, but the problems are distinct. The query (issue #4142) reports that wake_on_ext0 does not exist as a method on the RTC object at runtime — a missing implementation or API exposure problem from 2018. The candidate PR #17504 fixes a compile-time issue where machine_rtc_config.ext0_pin is accessed in wake_on_touch() and wake_on_ulp() on SoCs that lack SOC_PM_SUPPORT_EXT0_WAKEUP support, with the method itself presumably existing. The candidate does not add wake_on_ext0 to the RTC object; it guards existing code paths against undefined struct members on unsupported hardware.

Suggested action

Leave issue #4142 open. It predates the modern esp32 port structure and may already be resolved by the `wake_on_ext0` implementation added long ago — verify whether the method now exists in the current codebase. If it does, close #4142 as resolved (identifying the PR that added it). PR #17504 is unrelated to the original report.

ESP32: RTC no function 'wake_on_ext0'

esp32/modesp32: Fix access to ext0_pin only if defined.

Summary

Testing

Keyboard