Comments on: ESP32 Timer Wake Up from Deep Sleep

By: Steve

Steve — Sun, 19 May 2024 21:21:19 +0000

The deep sleep code works fine on a Seeed XIAOESP32-C3. The problem is how do I regain control of the ESP32? The com port appears every time it wakes up but almost instantly vanishes, leaving no time to upload new code

By: Euan

Euan — Thu, 15 Feb 2024 01:45:32 +0000

This will disable the wakeup time. Change the source for any other wake up trigger.

esp_sleep_disable_wakeup_source(ESP_SLEEP_WAKEUP_TIMER);

By: dailigon

dailigon — Tue, 20 Sep 2022 13:27:14 +0000

Hello, I would like to know whether it is possible to turn off the timer wake up once enabled (if the battery is too low, to not destroy it).

By: bongo

bongo — Mon, 10 Jan 2022 06:55:10 +0000

In reply to bongo. in the mean time, i found a solution: using RTC_NOINIT_ATTR instead of RTC_DATA_ATTR does the job.

By: bongo

bongo — Fri, 07 Jan 2022 14:47:25 +0000

as i get a reboot from time to time (for no known reason, it’s reported as SW_CPU_RESET for both cores), i tried to put all data that should survive a reboot in rtc ram by defining them as globals with RTC_DATA_ATTR in front.
to check out if it works, i used ESP.restart() to force a reboot after data has been configured.
unfortunately, my data reads back as 0 instead of the previously configured value.
shouldn’t this work?

By: Fred Verhoeckx

Fred Verhoeckx — Sun, 02 May 2021 11:19:30 +0000

In reply to Fred Verhoeckx.

Hi,

Problem solved by moving my include lines to the top of the code.
I did this after reading the comment of Sergi (add #include Arduino.h).

Still, it puzzles me: why does the site example not need to include Arduino.h ? And why does my own code need it??

Fred

By: Fred Verhoeckx

Fred Verhoeckx — Sun, 02 May 2021 11:13:20 +0000

In reply to Shashi Kiran.

Hi, any progress on this behaviour????

I get the same error, I use the timer wake-up sketch on a WiFi Lora 32(V2) board. The timer sketch, directly taken from the sample runs OK. Also when I re-compile it.

When I copy the first lines (up to and including the print_wakeup_reason() procedure into my own sketch, the compiler states: ‘RTC_DATA_ATTR’ does not name a type.

I thought that it could have something to do with the board still cycling the timer wake-up sketch, but as the original sketch compiles OK, this cannot be the cause.

By: Jordan

Jordan — Thu, 31 Dec 2020 15:55:14 +0000

I would like to put my esp32 into deep sleep with a timer. Currently esp 32 exposes an api which is called every 20 minutes. I would like to put him to sleep for 19 minutes, allow the api to respond and then put him back to sleep. I’ve seen your example but it doesn’t use the loop method. In my loop method there is the server.handleClient () statement; and with the sleep timer it is never called. how can i solve? Thanks to those who will answer

By: Jordan

Jordan — Thu, 31 Dec 2020 14:54:27 +0000

By: Thomas

Thomas — Thu, 24 Dec 2020 08:48:50 +0000

anyone knows how to disable the timer function in the code?
(i have to use the eneble function earlier)