nRF52840 ncs Watchdog resets

RE: nRF52840 ncs Watchdog resets

Einar Thorsrud — Thu, 27 Oct 2022 13:26:42 GMT

Hi,

Good to hear about the WDT issue.

Regarding DFU, I see your point, but that is what we provide. Note that a colleague of mine is also working on a unofficial SMP client to do DFU from an MCU, which you can look at: central_smp_client_dfu. I suggest opening a new case for DFU if needed though.

RE: nRF52840 ncs Watchdog resets

DavidKaplan — Thu, 27 Oct 2022 12:09:08 GMT

Thanks for your quick response.

I could see when I connect BLE to the peripheral, that my seconds variable increments every second, so the watchdog kick is being called.

After looking at the watchdog sample, I saw that the watchdog options parameter was set for debug.

I was also calling my ami_watchdog_Init() function twice in my initialization proceed by mistake which could be the real reason for the resets (I do not know since I did not investigate the Zephyr Nordic code).

After these changes, the peripheral does not reset with the debugger connected.

I will test it without the debugger and also in my Central code which had the same mistakes.

err = wdt_setup(wdt,WDT_OPT_PAUSE_HALTED_BY_DBG);

About the DFU, I can see that it looks like it uses ZCBOR & SMP which greatly complicates my Central's host code which is currently not a Nordic chip.

Thank you again, David

RE: nRF52840 ncs Watchdog resets

Einar Thorsrud — Thu, 27 Oct 2022 11:21:16 GMT

Hi,

I do not see enough of your code to be sure that you are seeing a WDT reset. Have you confirmed that? I ask as you print ResetCause:1, and if that means that RESETREAS is 1, that is pinreset. Perhaps you can explain where this number comes from?

Regarding the WDT code snippets you have include that looks sensible (though I do not have a full overview of the other code and I might have overlooked something) It looks like you have based it on the Watchdog Driver Sample, which is a sensible starting point, and this runs out of the box on a nRF52840 DK.

[quote user=""]I did not see any bootloader in the nRF52840's pdf, so I must use the SMP protocol or do things myself with the Zephyr code?[/quote]

We provide DFU capability in the nRF Connect SDK as well, based on the MCUboot bootloader. You can read more about it under Bootloaders and Device Firmware Updates. You may also find these unofficial bootloader samples useful.