STM32H755 Nucleo and PWR_DIRECT_SMPS_SUPPLY

[MJack.1]

Hi,

I'm using an STM32H755ZIQ Nucleo and migrating an old project in CubeMX 6.8.

The RCC > supply source > PWR_DIRECT_SMPS_SUPPLY option has been removed from CubeMX, which was the default previously.

I tried the two available options (External / LDO), both lock up the board and require full chip erase to continue.

I have read this knowledge article which suggests that the solution is to "Make sure that you fixed the power-supply configuration in your project". However the only available options do not work. If I manually put int the SMPS option again, it works.

I've read many posts relating to this issue, mostly about how to revive the board, but I haven't found an explanation for why the option is removed form CubeMX and why I (presumably) shouldn't be using that option any more.

If anyone can shed some light on how I'm supposed to configure the project so that the Nucleo is powered properly, that would be great.

Thanks, Matt

[FBL]

Hello @Community member​ 

I tried to reproduce the configuration; it works for me on CubeMX6.8.

 

Try to start a new project and initialize the peripherals with default settings.

[MJack.1]

Thanks for the reply - You're right, I can see the option if I start a new project.

I guess then it's related to the fact that my project is migrated from a previous version of CubeMX?

[FBL]

@Community member​ Would you mind sharing your IOC file and specify the source version in order to reproduce the issue and confirm the bug?

Thank you

[MJack.1]

Hi, I've attached the ioc file. I believe the migration was from 6.4 windows to 6.8 mac.

Many Thanks

[FBL · Accepted solution]

Hello @Community member​ 

In DS12919 for STM32H755, scale 0: boosted performance (available only with LDO regulator)"

Knowing that in VOS1 the max frequency is 400MHz. So SMPS is not available for 480Mz.

[MJack.1]

I can confirm that if I set my clock to 400MHz, I get the full range of options for the SMPS.

Thank you !