This is not a question then an information for NUCLEO STM32H7 (or others...) users:
After searching so many hours inside the software today i found the reason for malfunction:
Jumpers JP6 & JP7 was well closed (optical impression), but gave no stable connection.
After replacing the header plugs by soldering, the problem is gone, i'm happy.
By the way: Have checked even before signals with the scope and signals was seen -
anyway they was not stable obviously.
So, my suggestion is closing this jumpers in a save way and then trying to understand the
complex sofware :)
Michael.
