How to count the number of reset ? (WDT)

RE: How to count the number of reset ? (WDT)

Olfox — Tue, 04 Apr 2023 15:53:33 GMT

Thanks Kenneth. I tried on the devBoard to disconnect all my sensors pin, without effect.

I tried to un init the spi too but no impact.

I'm using a isp1907ht module, so i can't really access the pins directly on my custom board.

Ok thanks , i will create a new ticket i think :)

RE: How to count the number of reset ? (WDT)

Kenneth — Tue, 04 Apr 2023 15:24:31 GMT

The issue could still be due to floating pin, if you have a 1Mohm resistor you can try to ground one end and try to access the pins with the other end as see if the current suddenly changes.

Not sure of the other issue you have no with the power profiler app, you can try to make a new case for it (though I know there is a problem with the latest, but not sure if it's related to the description you have).

Kenneth

RE: How to count the number of reset ? (WDT)

Olfox — Tue, 04 Apr 2023 13:40:47 GMT

Hi Kenneth,

I make new measurement with my product ( not the devBoard this time), and i don't have the same strange value anymore.

My sleep current measure is arround 3.5uA. And i don't have the increasing of the average affect.

So may be linked to my custom devboard...

1. But I have a problem with the Power Profil softaware. The X time scale is false. when i have 10sec between advertising, the software indicate somethink like 5sec. It is like the X scale is corrupted. I tried to play with sampling rate , enable disable timestamp etc but nothing solve the issue. The value are still corrupted in the export csv.

I searched on the info center, some people had the issue but there is no real solution apparently. Did you face the issue too ?

2. Concerning ram retention, how to identify in whitch block my data are saved to disable the other block during sleep ?

Thanks a lot.

RE: How to count the number of reset ? (WDT)

Kenneth — Mon, 03 Apr 2023 15:08:56 GMT

[quote user="Olfox"]Thank you for your answer. So i should write into flash in wdt_event_handler ?[/quote]

No, you should on power up check the NRF_POWER->RESETREAS register, and if it indicate watchdog reset, then you can update the counter value.

[quote user="Olfox"]Sometimes i measure 60-80 sometimes, 70-90uA it depends. Please find some screenshoot below:[/quote]

Could be something floating? Such as an input not connected to a defined level (all inputs should be logic low or high). Also check out:
Optimizing Power on nRF52 Designs

Kenneth

RE: How to count the number of reset ? (WDT)

Olfox — Mon, 03 Apr 2023 13:58:16 GMT

When the device is totally cold, current oscillate between 20uA and 30uA. And by the time, it start to increase:

There is also a period in between when there is a lot of noise ( nrf52833 is sleeping after the first 3seconde after boot so it is no linked to any software acitivty).

After around 3min , the current is stabilized between 60-80uA.

According to the Product specifications, i should be more arround max 20uA with my accelerometer. I can wake on up on Interupt accelerometre pin and clock timer (24h).

RE: How to count the number of reset ? (WDT)

Olfox — Mon, 03 Apr 2023 13:39:57 GMT

Hi Kenneth,

Thank you for your answer. So i should write into flash in wdt_event_handler ?

I have another question concerning my power cunsumption. I find it a bit high ( between 60 and 80uA during sleep. I only have an accelerometre and the nrf52 in gpio wake up mode. I'm using PPK II to monitor it. there is a small shift too. Sometimes i measure 60-80 sometimes, 70-90uA it depends. Please find some screenshoot below:

RE: How to count the number of reset ? (WDT)

Kenneth — Mon, 03 Apr 2023 11:31:12 GMT

Hello,

There is no retained registers after watchdog, ref:
https://infocenter.nordicsemi.com/topic/ps_nrf52833/power.html#concept_res_behav

So you would need to store the counter in flash.

Kenneth