STM32L431 brown out.

[LeventF16]

Hello.

How can we enable brown out for this processor and the brown out voltage?

Thank you.

[Tesla DeLorean]

Perhaps it's covered in the Reference Manual, or there are examples in the code trees of CubeL4 ?

[Tesla DeLorean]

Some mechanics along the lines of..

 // Read the option byte
 FLASH_OBProgramInitTypeDef OBInit;
 HAL_FLASHEx_OBGetConfig(&OBInit);

 // Check bitwise if the brownout level is not 3
 if ((OBInit.USERConfig & OB_BOR_LEVEL_3) != OB_BOR_LEVEL_3)
 {
 // Set the brownout level to 3
 OBInit.OptionType = OPTIONBYTE_USER;
 OBInit.USERType = OB_USER_BOR_LEV;
 OBInit.USERConfig |= OB_BOR_LEVEL_3;

 HAL_FLASH_Unlock();
 HAL_FLASH_OB_Unlock();
 HAL_FLASHEx_OBProgram(&OBInit);
 // This function needs to be called Unlocked Flash and OB state.
 HAL_FLASH_OB_Launch();
 HAL_FLASH_OB_Lock();
 HAL_FLASH_Lock();
 HAL_FLASH_OB_Launch();
 }

[CGadg]

Is the option byte available in Cube IDE? I can't see it.

I've used the above code after initialisation and think it should be before initialisation, or better still in the option byte without a routine to change it.

[TDK]

You can adjust it in STM32CubeProgrammer along with other option bytes.