Soft Reset sources in the nRF52840

RE: Soft Reset sources in the nRF52840

Turbo J — Thu, 10 Sep 2020 10:32:10 GMT

Errata 136?

Also, some of the default fault/error handlers in the SDK contain a call to NVIC_SystemReset().

RE: Soft Reset sources in the nRF52840

Jørgen Holmefjord — Thu, 10 Sep 2020 08:56:16 GMT

As Turbo J said, the SREQ bit is set after reset triggered by the application calling NVIC_SystemReset() function. This typically happens in the error handler, triggered by an error code passed to APP_ERROR_CHECK, an assert, or a hardfault.

If you define the DEBUG flag in your preprocessor symbols, the error handler will print the cause of the error on the log, before entering an endless loop instead of triggering a soft reset. You can get similar output from the HardFault handling library if you include this in your project.

RE: Soft Reset sources in the nRF52840

Aidan B — Wed, 09 Sep 2020 20:56:26 GMT

Hello,

I am looking for a hardware description as to the possible sources of a SREQ bit being set in the RESETREAS register.

We are seeing random resets in our application, and the SREQ bit is set when the reset vector is jumped to. Is it set when a null pointer is taken for example.

Thx,

Aidan

RE: Soft Reset sources in the nRF52840

Turbo J — Wed, 09 Sep 2020 20:49:58 GMT

You may want to elaborate a bit on "soft reset".

Otherwise: NVIC_SystemReset() function.