Watchdog is useless

[Fabien Comte]

Hello,

I have a secure bootloader and an application on nRF52840 with SD 15.2.

I try to add watchdog support in application based on watchdog exemple but if i remove feed, it not resets… 

Do someone have an idea please ?

Thank you.

[WestCoastDaz]

Fabien Comte I have used the Watchdog in more than one application and I can assure you it definately resets the chip.  Can you share some of the WD init code?

Thanks

[Fabien Comte]

Sorry my title have several senses. I am sure that it works but not in my case :-)

nrf_drv_wdt_channel_id m_channel_id;


void wdt_event_handler(void)
{
}


int main(void)
{

	// ...

	//BSP configuration for button support: button pushing will feed the dog.
    uint32_t err_code = nrf_drv_clock_init();
    APP_ERROR_CHECK(err_code);
    nrf_drv_clock_lfclk_request(NULL);

	//Configure WDT.
    nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
    uint32_t err_code = nrf_drv_wdt_init(&config, wdt_event_handler);
    APP_ERROR_CHECK(err_code);
    err_code = nrf_drv_wdt_channel_alloc(&m_channel_id);
    APP_ERROR_CHECK(err_code);
    nrf_drv_wdt_enable();
	nrf_drv_wdt_channel_feed(m_channel_id);
	
	ble_stack_init();
	
	
	while (1)
	{
		//nrf_drv_wdt_channel_feed(m_channel_id); // commented to expect reset
	}
	
	
	// ...
}

[Kenneth]

Some quick questions:

• This is pretty much the same as the example code from the SDK, does that also fail "as-is"?
• How do you ensure that the timeout does not occur?
• Have you modified any parameter in NRF_DRV_WDT_DEAFULT_CONFIG from sdk_config.h?
• What is the is markings on the nRF52840 ic you have?

Best regards,
Kenneth

[WestCoastDaz]

I agree with Kenneth, more information is required to help and his list is a great place to start.  Some other details I thought of:

1. Are you using the debugger during your testing?
2. Can you be sure that your system is running?

[Fabien Comte]

Hello Kenneth and Darren,

Kenneth answers

- SDK's example looks without SD and probably no bootloaded too.

- A LED that blink on startup.

- Yes for reload. I wanted 15 s so i tried 15000 and 15 x 32768 without success.

- Hard to say, it's in a fanstel module. Can I read any register to know ?

Thank you for your help.

Darren answers

- For RTT but I also tried without.

- I do a test with a basic loop with GPIO toggle without any success too.

Thank you both for your helps