machine.wake_reason()

[giancarlo64]

Hi,
I have to detect the cause of a wake-up of the ESP32 from deep-sleep. In my case It could be from a timer or from an external pin.
For this reason I use the fuction machine.wake_reason() to detect it.
First of all some description tell that the return value of this function should be a tuple other a constant. What is right?
Second: from the constants listed in micropython.org (machine.WLAN_WAKE, machine.PIN_WAKE, machine.RTC_WAKE) only PIN.wake is recognized. The other constants during exection give me an error ('module' object has no attribute 'RTC_WAKE' .... )
Third: I get a retured value from a timer deepsleep of 4 (the cause listed in the doc are 3)

I'm a little bit confused how to use this function

Gian Carlo

[mattytrentini]

I haven't used this particular feature but I believe the implementation is in modmachine.c:238.

From what I can tell it appears to be converting the enumeration returned by the ESP-IDF call esp_sleep_get_wakeup_cause(). That enumeration is defined by esp_sleep_source_t.

There is currently no mapping between the values returned and MicroPython constants. Until such a mapping is put in place, I think it would be best to trigger the various wake-up causes and check the integer values returned. Then you can use those integer values to check the wakeup reason. Be aware they may change between ESP-IDF updates!

[giancarlo64]

Hi Mattytrentini,
thanks! I will do so.