watchdog on nRF9160

RE: watchdog on nRF9160

Stian Røed Hafskjold — Tue, 03 Aug 2021 12:52:52 GMT

Hi, the debugging interface is reset after a WDT reset, so this is expected behavior. You need to re-attach to the debugger after a WDT reset.

https://infocenter.nordicsemi.com/topic/ps_nrf9160/pmureset.html?cp=2_0_0_4_0_4_7#reset_behaviour

RE: watchdog on nRF9160

Canastra — Fri, 23 Jul 2021 09:15:31 GMT

I create a sample from the samples button and watchdog for nRF9160 DK.

devzone.nordicsemi.com/.../buttonWdt.zip

The watchdog is feed as log as the button is not pressed.

If the button is pressed the watchdog timeout and reset.

Now the debugger does no longer stop on breakpoint and the __BKPT() thrown a hardfault.

How can the debugger use with breakpoints after a dog reset?

RE: watchdog on nRF9160

Canastra — Thu, 22 Jul 2021 15:42:57 GMT

Hi,

Now I can build with watchdog.

I add the following flag: WDT_OPT_PAUSE_HALTED_BY_DBG

err = ::wdt_setup(wdt, WDT_OPT_PAUSE_HALTED_BY_DBG);

Otherwise stepping isn't possible,

Now I've the following problem.

I feed the dog until i press a key.

When I press the key the watchdog timeout and a hardfault is executed

[00:00:00.009,338] <err> os: ***** HARD FAULT *****
[00:00:00.014,953] <err> os: r0/a1: 0x00000001 r1/a2: 0xffffffff r2/a3: 0x00000001
[00:00:00.023,773] <err> os: r3/a4: 0x2001065c r12/ip: 0x0000f9c0 r14/lr: 0x0001071d
[00:00:00.032,592] <err> os: xpsr: 0x21000000
[00:00:00.037,872] <err> os: r4/v1: 0x000165cd r5/v2: 0x00000000 r6/v3: 0x00013880
[00:00:00.046,691] <err> os: r7/v4: 0x00013880 r8/v5: 0x00013880 r9/v6: 0x00013880
[00:00:00.055,511] <err> os: r10/v7: 0x00013880 r11/v8: 0x00013880 psp: 0x20010a30
[00:00:00.064,300] <err> os: EXC_RETURN: 0xffffffbc
[00:00:00.069,946] <err> os: Faulting instruction address (r15/pc): 0x0001836c
[00:00:00.077,972] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
[00:00:00.085,906] <err> os: Current thread: 0x20010218 (unknown)
[00:00:00.092,773] <err> fatal_error: Resetting system

As Reset reasen 00010000 is set. This is not a watchdog reset!

After that the debugger does no longer break on a breakpoint.

A power on Reset is required to work again.

Can this improuved?

RE: watchdog on nRF9160

Stian Røed Hafskjold — Mon, 19 Jul 2021 16:56:16 GMT

Hi, sorry for the late response. I tried adding the code you posted, and the configs to a standard sample in NCS, but it compiles just fine. Are you able to post the complete project here?