docs/ESP32: Reinitialize watchdog timer with longer timeout. #11981
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I think we discussed this before, that the idea of a WDT is that it cannot be reconfigured. That's a feature, not a limitation, because it prevents code from accidentally disabling the WDT (eg by setting the timeout to a very large number). If the WDT cannot be fed fast enough then other things should be fixed so it can be fed fast enough. |
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Let's start from the very beginning. A problem occurs when you want to update the software: SOLUTION: Re-initializing the WDT gives you time to update the software. boot.py is not interesting main.py starts automatically |
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@IhorNehrutsa I liked so much you PR, because I will need to update my What I'm thinking to do is:
I think that using this approach you do not need to change the watchdog timer. Does that make sense for you? Thank you! |
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@beyonlo |
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@beyonlo @IhorNehrutsa I know this works because I've been working on it for a while at asyncmd. The only limitation (apart from time precision) I've found so far when it comes to the number of tasks currently running is memory which if using a Footnotes
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@Carglglz I did read about the aiorepl and it is wonderful - I want to use it the future for real time inspection :) But in my case I need to download a Problem is that write data in the flash is blocking. So, with watchdog timer with 1 second, to write/unpack all that data in the flash will take more than 1s. So, even that I'm using |
@IhorNehrutsa I not started to write that |
@IhorNehrutsa There is a PR for an |
I recognise that 1s watchdog timeout is pretty tight, any reason why 5s or 10s wouldn't work?
The only trade-off I see is that it would be a few seconds slower I guess... 🤔 |
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Hello @Carglglz
In my case I need to read some sensors each ~500 ms (it is a prerequisite - I have a thread just for that) with max 1s/2s, and if that do not read in until 2s, I need to act a relay(alarm)
Yes, I though in that too. I'm already using the new In my opinion/my vision, maybe is much dangerous to work in the limit of watchdog timeout during the |
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docs/ESP32: Reinitialize watchdog timer with longer timeout. Signed-off-by: Ihor Nehrutsa <IhorNehrutsa@gmail.com>
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If the WDT timeout is short(several seconds), a problem occurs when updating the software:
you don't have enough time to copy updates to the device.
ESP32 allows reinitializing the watchdog with a longer timeout - like an hour.
Discussion in
ESP32/machine_wdt.c: Add WDT.deinit() method. #6631
The best explanation at comment
This PR is a copy of #10901 which was damaged due to rebase.