STM32-H755ZI system clock configuration error with changed CPU clocks from default

[marte2003]

Hello everyone,

I choose the stm32 H755ZI (develop board) because I need a dual core microcontroller and a fast one. I never worked with dual core before (I did with STM32 and CubeIDE) so i let everything for default mode and tried to debug my project with this tutorial:

https://www.youtube.com/watch?v=jI1k6p-fduE&t=254s 

It worked and it seem time to change the settings too my project. 

My settings for the clock:

RCC settings:

and some other stuff with timers etc.

Then I wanted to debug again and the M4 core passed out and the M7 core ended up in this while loop in system clock config: 

I tried multipel things: 1. lower clock config 2. lower clock config in combination with SMPS instead of LDO, but nothing works. Can anyone help me please? Thanks!!

Greetings from Holland 

[Semer CHERNI]

Hello @marte2003 

First let me thank you for posting :) .

I need to ask what is the STM32CubeMX version used? The GUI seems to be the old one.

Also, the "SupplySource" generated code is not aligned with the STM32CubeMX configuration: In the STM32CubeMX the configuration is "PWR_SMPS_1V8_SUPPLIES_LDO" and in the generated code is "PWR_DIRECT_SMPS_SUPPLY"

KR,
Semer.