Brown out detection in zephyr

[MaazSk]

Does zephyr provide support for brown out detection. are there any apis to enable and disable the same?

The only thing I am able to find close to BOR is this. Can someone please help me how to enable and disable it for stm32h7. Or do I need to use HAL or something else?

[yashi]

Enable CONFIG_HWINFO_STM32?

I'm not STM expart but here is the driver: drivers/hwinfo/hwinfo_stm32.c

[FRASTM]

Yes, you have hwinfo_get_reset_cause() which gives you the reset cause
(for example, see samples/boards/st/power_mgmt/standby_shutdown/src/main.c )

[MaazSk]

I want to disable my brownout detection. Could you please guide me how to do it?

[FRASTM]

Not sure to catch what is your purpose. On a system reset, the stm32H7 mcu has positioned a flag (in its RCC RSR status register) indicating if brownout reset occured or any other reset source (watchdog, pin). If you want not to detect it, just do not read the flag (do not call the hwinfo_get_reset_cause or clear it unconditionnaly with hwinfo_clear_reset_cause)
The hwinfo_get_reset_cause is a zephyr API, but there is none hwinfo API for enabling/disabling reset_cause()

[MaazSk]

Here is the thing I just want to disable the BOR for my application and I don't want the BOR to be triggered so is there a way to do it using zephyr apis or any other method?

[FRASTM]

The BOR signal (bit BORRSTF of the RCC_RSR reset status reg ) is a signal automatically "Set by hardware when a BOR reset occurs" that cannot be disabled.
Clearing is still possible by software by "writing the RMVF bit", for example during the soc_early_init_hook(), but what would be the benefit if you never read that flag ?

[MaazSk]

Let me rephrase the question again

In the image below

We can set the BOR to OFF. So, I want to understand if there is any zephyr API to set the BOR to the above levels?
I know this can be done through option bytes in the stm32 cube programmer and also through ST HAL library but does zephyr provide any interface to do so?

[FRASTM]

Thank for clarification @MaazSk
There is no zephyr API to change the option bytes in the stm32 flash as this is very specific to stm32 devices.
However there is a way to manipulate the Option Bytes through stm32Cube HAL driver layer. This is done as example, in the PR #79985 : define the OBInit.USERConfig and program with HAL_FLASHEx_OBProgram

[MaazSk]

Thank you! @FRASTM,