nrf52840, there is no difference between the software reset reason and reset by the "buffer overflow detected" reason

RE: nrf52840, there is no difference between the software reset reason and reset by the "buffer overflow detected" reason

Susheel Nuguru — Thu, 18 Jan 2024 11:56:11 GMT

Check if this code relocation documentation helps.

RE: nrf52840, there is no difference between the software reset reason and reset by the "buffer overflow detected" reason

Stas Jis — Tue, 16 Jan 2024 14:19:26 GMT

Thanks, this helped. You can also tell me how to override the address from which the firmware will be launched.

The linker.cmd file is generated every time the project is built, but the addresses in it cannot be redefined.

How to do this correctly?

RE: nrf52840, there is no difference between the software reset reason and reset by the "buffer overflow detected" reason

Susheel Nuguru — Mon, 15 Jan 2024 13:01:59 GMT

You just need to override the __weak implementation k_sys_fatal_error_handler functionality. Search for this in the SDK and you will know how to do it.

You probably need to disable CONFIG_BT_HCI_VS_FATAL_ERROR, Haven't tested it myself but it should be an easy test for you. If you are finding it difficult, then I can do a quick test later.

RE: nrf52840, there is no difference between the software reset reason and reset by the "buffer overflow detected" reason

Stas Jis — Mon, 15 Jan 2024 12:56:58 GMT

Hi Susheel Nuguru ,

We fundamentally need to intercept this hardware exception.
Can we intercept it somewhere in the code in hardfault handler? If yes, how can this be done?

RE: nrf52840, there is no difference between the software reset reason and reset by the "buffer overflow detected" reason

Susheel Nuguru — Mon, 15 Jan 2024 08:24:25 GMT

Most likely a buffer overflow will cause an hardware exception that is handled in the hardfault handler. The hardfault handler most likely is doing a soft reset at the end. Please note that the core does not generate automatically any kind of resets on buffer overflow.