Use pin_wakeup_sleep with different pins and wakeup reasons

[d.alvrzx]

I have 2 different pins that must wake up my LoPy4 from deepsleep. One of them is P14 and it must wake up when value goes LOW. The other is P23 and it must wake up when value goes HIGH.

I thought I could just do:

machine.pin_sleep_wakeup(['P14'], mode=machine.WAKEUP_ALL_LOW, enable_pull=False)
machine.pin_sleep_wakeup(['P23'], mode=machine.WAKEUP_ANY_HIGH, enable_pull=False)

And that would achieve the behaviour I described. Unfortunately, when doing this, it seems the first instruction is overwritten, so only P23 is able to wake the device up, not P14.

Since each pin wakes up the device with different values (HIGH and LOW), I cannot write this in only 1 instruction... Any ideas?

Running 1.20.2.rc6 fw.

[d.alvrzx]

Following up on this, it seems this post confirms mi suspicion that a second call to pin_sleep_wakeup() overwrites previous calls: https://forum.pycom.io/topic/5716/how-to-wake-up-the-lopy-with-the-accelerometer/5?_=1626977858609

@Gijs do you know if this a HW limitation of the ESP32 or could this functionality be added by modifying the firmware?

[Gijs]

You can add both pins in the same tuple, but I believe you cannot select both modes at the same time, even if you set it for different pins, as you mentioned, the second command overrides the first, and I think it is not possible on the hardware level.

[jcaron]

@d-alvrzx the ESP32 has various sleep modes with various possibilities for wake up sources. The lowest power modes are indeed quite limited by design. IIRC the Pycom firmware uses ext1 wake up. You’ll find details of the different wake up sources of the ESP32 in the ESP IDF docs: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/sleep_modes.html