STM32H757 Eval Board locked in illegal power configuration. How to unlock ?

[baptor]

Hi,

I dont know how this happened, but my Eval board STM32H757 can not go after :

SystemClock_Config() ==> HAL_PWREx_ConfigSupply() ==> while (__HAL_PWR_GET_FLAG (PWR_FLAG_ACTVOSRDY) == 0U)

The progam stay in the while loop :

 while (__HAL_PWR_GET_FLAG (PWR_FLAG_ACTVOSRDY) == 0U)

from what I see, the

 MODIFY_REG (PWR->CR3, PWR_SUPPLY_CONFIG_MASK, SupplySource);

doesn't modify SMPSEN or LDOEN. They are bot to state "1". In the datasheet ( with STANDBY =0 and SMPSLEVEL =0 ), it is an illegal setup:

"Illegal combination, the default configuration is kept. (write

data will be ignored)."

the Programm is directly outputed from cubemx ( default perepheral setup )

So I am stuck here, and I dont know how to move forward.

Does anybody know the path to recover this?

Thank you

[baptor]

I also did the dead lock recover procedure that didn't changed CR3 register values, so did not solved the problem.

[Tesla DeLorean · Accepted solution]

Strap BOOT0 HIGH and POWER CYCLE the board several times.

A reset is not typically enough, you need to remove all power, and then reapply.

Erase the Flash, then use one of the example projects designed for the board. Confirm that works properly

[baptor]

Thank you, it did the job. Now registers are SMPS = 1 and LDOEN =0. The code is running well.