esp32c3 deepsleep with wake up on gpio

[jkorte-dev]

I wanted to use deepsleep with wake up on gpio pin with esp32c3 but could not find wake_on_ext0() in esp32 module in the latest micropython (master branch). It was there before (micropython 1.2.23) and it should be supported by the hardware (https://docs.espressif.com/projects/esp-idf/en/stable/esp32c3/api-reference/system/sleep_modes.html). Does anybody know why it has been removed?

% mpremote exec 'import os; print(os.uname()); import esp32; help(esp32)'
(sysname='esp32', nodename='esp32', release='1.27.0-preview', version='v1.27.0-preview.208.gadf6319884.dirty on 2025-10-18', machine='ESP32C3 module with ESP32C3')
object <module 'esp32'> is of type module
  __name__ -- esp32
  gpio_deep_sleep_hold -- <function>
  mcu_temperature -- <function>
  idf_heap_info -- <function>
  NVS -- <class 'NVS'>
  Partition -- <class 'Partition'>
  RMT -- <class 'RMT'>
  WAKEUP_ALL_LOW -- False
  WAKEUP_ANY_HIGH -- True
  HEAP_DATA -- 4
  HEAP_EXEC -- 1

% mpremote exec 'import os; print(os.uname()); import esp32; help(esp32)'
(sysname='esp32', nodename='esp32', release='1.23.0', version='v1.23.0 on 2024-06-02', machine='LOLIN_C3_MINI with ESP32-C3FH4')
object <module 'esp32'> is of type module
  __name__ -- esp32
  wake_on_touch -- <function>
  wake_on_ext0 -- <function>
  wake_on_ext1 -- <function>
  wake_on_ulp -- <function>
  gpio_deep_sleep_hold -- <function>
  mcu_temperature -- <function>
  idf_heap_info -- <function>
  NVS -- <class 'NVS'>
  Partition -- <class 'Partition'>
  RMT -- <class 'RMT'>
  WAKEUP_ALL_LOW -- False
  WAKEUP_ANY_HIGH -- True
  HEAP_DATA -- 4
  HEAP_EXEC -- 1

[mattytrentini]

Please see #17518 for an implementation of wake on GPIO. If you could test it and report back that'd be great!

I think - though am not sure! - that the reason that it stopped working in the past was due to a change in the Espressif IDF - so the previous implementation no longer worked with the newer IDF version we were moving toward.

[jkorte-dev]

Good news! I will try the PR tomorrow. Thanks a lot

[jkorte-dev]

I tested the PR and it works :-) I left some comments in the PR.