Why is USE_PWR_LDO_SUPPLY defined by default when generating a project in CUBEMX?

[Peter3718]

Hi there, 

i configure power as PWR_DIRECT_SMPS_SUPPLY, 

but after generating project,  both PWR_USE_LDO_SUPPLY and PWR_DIRECT_SMPS_SUPPLY are defined. This will cause program exception sometime, i have to remove USE_PWR_LDO_SUPPLY.  I took several days to locate this issue!

so my question is:

1. Why is USE_PWR_LDO_SUPPLY always defined by default?

2. Where are these preprocessors comming from? so I can configure.

 

Best regards

Peter

 

 

[Tesla DeLorean]

>>Why is USE_PWR_LDO_SUPPLY always defined by default?

Probably because a significant majority of ST boards, be it DISCO, EVAL and NUCLEO use the LDO

There are a handleful of -Q / -P boards/chips using the SMPS mode.

Some chips run at derated speeds with SMPS

So, I'd expect the defaults here are driven by part or board selection earlier in the process.

From your post it's not clear what board/chip you are bug reporting.

[Peter3718]

I use STM32H755ZIT6,  if generating from ST board NUCLEO-H755ZI-Q in CUBEMX, it has no this preprosssor. If generating from chip level, even has no any IO setting, the two predefined marco are there. You can try this, it's really tricky!  I want to know where it is from.

Peter

[Amel NASRI]

Hi @Peter3718 ,

Thanks for bringing this issue to our attention. I tracked it internally (199456) for farther investigation by our development team, looking forward for a quick fix.

A similar problem is being discussed here.

-Amel

 

[GMG]

Same problem! Two days of wast time for this problem on NUCLEO-H755ZI-Q!

Also USE_PWR_LDO_SUPPLY is recreated in the defines for CM4 e CM7 every time you modify the IOC file and regenerate de code.

I have no words to describe...