<![CDATA[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!

]]>https://community.m5stack.com/topic/686/hold-digital-pin-state-in-sleep-modeRSS for NodeSun, 08 Mar 2026 03:42:25 GMTTue, 19 Feb 2019 18:18:18 GMT60<![CDATA[Reply to Hold digital pin state in sleep mode? on Wed, 20 Feb 2019 10:39:23 GMT]]>@m5er That is part of the problem, the ULP is not well documented and everyone is struggling with it

]]>https://community.m5stack.com/post/3090https://community.m5stack.com/post/3090Wed, 20 Feb 2019 10:39:23 GMT<![CDATA[Reply to Hold digital pin state in sleep mode? on Wed, 20 Feb 2019 09:16:23 GMT]]>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.

]]>https://community.m5stack.com/post/3089https://community.m5stack.com/post/3089Wed, 20 Feb 2019 09:16:23 GMT<![CDATA[Reply to Hold digital pin state in sleep mode? on Wed, 20 Feb 2019 08:48:03 GMT]]>@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

]]>https://community.m5stack.com/post/3087https://community.m5stack.com/post/3087Wed, 20 Feb 2019 08:48:03 GMT<![CDATA[Reply to Hold digital pin state in sleep mode? on Wed, 20 Feb 2019 07:38:43 GMT]]>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.

]]>https://community.m5stack.com/post/3086https://community.m5stack.com/post/3086Wed, 20 Feb 2019 07:38:43 GMT