Hold digital pin state in sleep mode?



  • Can anyone provide a working C++ example how to hold a digital output pin HIGH during ESP32 deep sleep? Thanks!


  • M5Stack

    Hello @m5er "Deep-sleep mode: Only RTC is powered on. Wi-Fi and Bluetooth connection data are stored in RTC
    memory. The ULP-coprocessor can work" I think that it means the clock which drives GPIOs will sleep as well.



  • @m5er said in Hold digital pin state in sleep mode?:

    Can anyone provide a working C++ example how to hold a digital output pin HIGH during ESP32 deep sleep? Thanks!

    You need to look into the ULP for that as both cores of the esp are inactive during deep sleep



  • Thank you @watson and @ajb2k3. I did look into the documentation before asking this question, but it wasn't very clear to me how to put this into practice. That is why my question asked for a working example. I will still appreciate if someone could post that.



  • @m5er That is part of the problem, the ULP is not well documented and everyone is struggling with it


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