Dfu not sucess when app init and enable wdt,although I feeddog and disable the wdt

RE: Dfu not sucess when app init and enable wdt,although I feeddog and disable the wdt

Vidar Berg — Tue, 21 Jan 2020 09:47:10 GMT

The WD will continue to run in DFU mode, so you will get a reset if you don't feed it in your bootloader code as well. In SDK 14 there is also the "while (nrf_clock_lf_is_running())" statement that will prevent the bootloader from booting the app as long as the WD is running, please take a look at this thread here for more details: https://devzone.nordicsemi.com/f/nordic-q-a/30677/bootloader-doesn-t-load-application-with-watchdog/

RE: Dfu not sucess when app init and enable wdt,although I feeddog and disable the wdt

Roger huang — Tue, 21 Jan 2020 09:36:13 GMT

Dear Vidar

when I set WD reload value to 120000,about 2 minutes, I find app connecting all the time, till wdt time come, nrf52 reset.

so I guess when start the ota, my apptimer stop, and PC do not work in main while, so WDT not feed.

and ble connecting fail all the time.

so it just like 1, when open wdt, ble dfu service connect fail, but nus sucess

2, when open wdt, and start ota, app timer stoped

thanks for your suggestion very much!

RE: Dfu not sucess when app init and enable wdt,although I feeddog and disable the wdt

Roger huang — Tue, 21 Jan 2020 07:06:21 GMT

I test as below:

when I init and start wdt in app, though I feed wdt, DFU entry fail, but if I do not use wdt in APP, DFU is normal.

SDK is SDK14.2,

thanks for support.

RE: Dfu not sucess when app init and enable wdt,although I feeddog and disable the wdt

Roger huang — Tue, 21 Jan 2020 03:23:44 GMT

so if I init the WD in app, after go to dfu, I must feedwdt of app?

RE: Dfu not sucess when app init and enable wdt,although I feeddog and disable the wdt

Roger huang — Tue, 21 Jan 2020 03:21:11 GMT

I use SDK nRF5_SDK_14.2.0_17b948a, so bootloader have reload WD.

but what's the relation of this question, when I init the WD in app, will not entry to dfu successly?

RE: Dfu not sucess when app init and enable wdt,although I feeddog and disable the wdt

Vidar Berg — Mon, 20 Jan 2020 14:25:05 GMT

Hi,

It's not possible to stop the WDT in SW after it has been started. nrf_wdt_int_disable() may be used to disable the TIMEOUT interrupt, but it will not stop the WDT.

Which SDK version are you currently using? Bootloader from SDK 15.0.0 and later should reload the WD automatically.

Best regards,

Vidar