There is an error in the WDT driver SDK15.2

RE: There is an error in the WDT driver SDK15.2

awneil — Wed, 24 Jul 2019 10:51:55 GMT

Another case today:

https://devzone.nordicsemi.com/f/nordic-q-a/50147/wdt-triggered-too-early

RE: There is an error in the WDT driver SDK15.2

Simon — Fri, 19 Jul 2019 15:57:20 GMT

You are completely right, thanks for reporting it. This bug was discovered in SDK 11 as well, and has been reported and fixed (look at SDK 14.X.0). However, it seems like the the bug is reintroduced with the new nrfx drivers. I have reported the bug internally.

Best regards,

Simon

RE: There is an error in the WDT driver SDK15.2

kxct — Thu, 18 Jul 2019 12:38:21 GMT

Please take a look at this code. Data overflow when performing multiplication。

    nrf_wdt_reload_value_set((p_config->reload_value * 32768) / 1000);

RE: There is an error in the WDT driver SDK15.2

Simon — Thu, 18 Jul 2019 12:19:02 GMT

This is not an error, it is not the intention that the reload value should be bigger than 4294967295 (largest number that a 32 bit variable can hold), see WDT_CONFIG_RELOAD_VALUE in the sdk_config.h:

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


#ifndef WDT_CONFIG_RELOAD_VALUE
#define WDT_CONFIG_RELOAD_VALUE 2000
#endif

Best regards,

Simon