WDT not firing (SDK v15.3.0, S132 v6.1.1)

Question

Hi,

I'm running into issues with the watchdog never firing. I'm using SDK v15.3.0, with S132 v6.1.1, and a custom bootloader (based off secure_bootloader example).

The watchdog initialization is successful.. When using a debugger, the WDT registers display the correct WDT configuration and WDTSTATUS is 1 (watchdog is running). However, the watchdog never times out, even if I'm not feeding the watchdog.

Additionally:

1. Watchdog doesn't reset in debug or non-debug mode.

2. LFCLOCK is initialized and running.

3. WDT setting is set to pause in SLEEP and HALT.

4. There is a bug in the bootloader - if it's loaded by itself with no app, the bootloader will just hang (won't advertise, won't run app_timer).

Here is the wdt initialization code:

  ret_code_t error_code;

  // Configure watchdog timer.
  // Note, SDK has a typo for the default config define.
  nrfx_wdt_config_t config = NRFX_WDT_DEAFULT_CONFIG;
  error_code = nrfx_wdt_init(&config, wdt_event_handler);
  APP_ERROR_CHECK(error_code);

  // Allocate watchdog timer channel.
  error_code = nrfx_wdt_channel_alloc(&s_channel_id);
  APP_ERROR_CHECK(error_code);

  // Enable watchdog timer.
  nrfx_wdt_enable();

  NRF_LOG_INFO("Watchdog enabled");

Here is the wdt configuration setting (for both bootloader and application):

// <e> NRFX_WDT_ENABLED - nrfx_wdt - WDT peripheral driver
//==========================================================
#ifndef NRFX_WDT_ENABLED
#define NRFX_WDT_ENABLED 1
#endif
// <o> NRFX_WDT_CONFIG_BEHAVIOUR  - WDT behavior in CPU SLEEP or HALT mode

// <1=> Run in SLEEP, Pause in HALT
// <8=> Pause in SLEEP, Run in HALT
// <9=> Run in SLEEP and HALT
// <0=> Pause in SLEEP and HALT

#ifndef NRFX_WDT_CONFIG_BEHAVIOUR
#define NRFX_WDT_CONFIG_BEHAVIOUR 0
#endif

// <o> NRFX_WDT_CONFIG_RELOAD_VALUE - Reload value  <15-4294967295>


#ifndef NRFX_WDT_CONFIG_RELOAD_VALUE
#define NRFX_WDT_CONFIG_RELOAD_VALUE 2000
#endif

// <o> NRFX_WDT_CONFIG_NO_IRQ  - Remove WDT IRQ handling from WDT driver

// <0=> Include WDT IRQ handling
// <1=> Remove WDT IRQ handling

#ifndef NRFX_WDT_CONFIG_NO_IRQ
#define NRFX_WDT_CONFIG_NO_IRQ 0
#endif

// <o> NRFX_WDT_CONFIG_IRQ_PRIORITY  - Interrupt priority

// <0=> 0 (highest)
// <1=> 1
// <2=> 2
// <3=> 3
// <4=> 4
// <5=> 5
// <6=> 6
// <7=> 7

#ifndef NRFX_WDT_CONFIG_IRQ_PRIORITY
#define NRFX_WDT_CONFIG_IRQ_PRIORITY 6
#endif

// <e> WDT_ENABLED - nrf_drv_wdt - WDT peripheral driver - legacy layer
//==========================================================
#ifndef WDT_ENABLED
#define WDT_ENABLED 1
#endif
// <o> WDT_CONFIG_BEHAVIOUR  - WDT behavior in CPU SLEEP or HALT mode

// <1=> Run in SLEEP, Pause in HALT
// <8=> Pause in SLEEP, Run in HALT
// <9=> Run in SLEEP and HALT
// <0=> Pause in SLEEP and HALT

#ifndef WDT_CONFIG_BEHAVIOUR
#define WDT_CONFIG_BEHAVIOUR 0
#endif

// <o> WDT_CONFIG_RELOAD_VALUE - Reload value  <15-4294967295>


#ifndef WDT_CONFIG_RELOAD_VALUE
#define WDT_CONFIG_RELOAD_VALUE 2000
#endif

// <o> WDT_CONFIG_IRQ_PRIORITY  - Interrupt priority


// <i> Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest)
// <1=> 1
// <2=> 2
// <3=> 3
// <4=> 4
// <5=> 5
// <6=> 6
// <7=> 7

#ifndef WDT_CONFIG_IRQ_PRIORITY
#define WDT_CONFIG_IRQ_PRIORITY 6
#endif

Is there somewhere else that's potentially feeding the watchdog (ie in the SD)? Any help would be useful, thanks!

yutingh · Accepted Answer

After re-configuring the watchdog register to 9 (always run in sleep and halt), my watchdog is now resetting the device after every 2 seconds.

WDT not firing (SDK v15.3.0, S132 v6.1.1)

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