Watchdog timer getting reset continuously

RE: Watchdog timer getting reset continuously

Hung Bui — Wed, 28 Oct 2020 10:28:16 GMT

Hi Pankti,

I'm not sure why it doesn't work for you but WDT is not that complicated. I attached here an example that I modified the ble_app_beacon to add WDT. It uses an app timer to refresh the wdt.
If button 1 is pressed (P0.13==0) it will not refresh the wdt and will reset after 2 seconds.

devzone.nordicsemi.com/.../5621.ble_5F00_app_5F00_beacon_5F00_wdt.zip

RE: Watchdog timer getting reset continuously

pankti583 — Tue, 27 Oct 2020 01:23:13 GMT

Hi Hung Bui,

I checked, the problem here is, wdt_timer_handler is never getting called, I was then looking on the devzone for the issue and found this https://devzone.nordicsemi.com/f/nordic-q-a/1396/timer-handler-never-called. Here, it asks to start LFCLK manually, if not using softdevice. In the code, i have used softdevice and there are multiple timers. I referred to the example - ble_app_hrs, in the SDK 15.2, where multiple timers have been implemented.

Also, gone through, the Application Timer Tutorial

https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/application-timer-tutorial

and Application Timer Library http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v14.1.0/lib_timer.html?cp=4_0_0_3_46 .

And, in the forum, referred related posts :

https://devzone.nordicsemi.com/f/nordic-q-a/53220/multiple-timers-and-scheduler/215218#215218

https://devzone.nordicsemi.com/f/nordic-q-a/65764/app_timer-instant-timeout

https://devzone.nordicsemi.com/f/nordic-q-a/198/comprehension-question-timer/1088#1088

https://devzone.nordicsemi.com/f/nordic-q-a/42904/app-timer-and-scheduler-issues-and-enhancements/167740#167740

https://devzone.nordicsemi.com/f/nordic-q-a/29399/timer-interrupt-priority-and-ble-connection

After, referring to the above posts and few others, I thought to add app_scheduler and referred to https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/scheduler-tutorial

I found it difficult to understand the scheduler tutorial and the example gave me compilation errors, I was not able to figure out why wdt_timer_handler is not called? I added a breakpoint, but it never gets executed. It would be very helpful, if you can guide me through this issue.

Thank you

Pankti

RE: Watchdog timer getting reset continuously

Hung Bui — Fri, 23 Oct 2020 15:47:16 GMT

Hi Pankti,

Have you configured the nRFX_WDT module in sdk_config.h as showed in the wdt example ?

Please check and make sure wdt_timer_handler() is called every 2 seconds.

If you use the default NRF_DRV_WDT_DEAFULT_CONFIG , which set the WDT timeout to 2 seconds, I would suggest to set the timer timeout to less than 2 seconds, for example 1 second.

Note that you must do a power reset after programing and before testing with WDT otherwise the WDT reset won't take effect if the chip is in debug mode.

Please try to test using wdt example in the SDK. You can think of implementing a timer to reload instead of the button as in the example.