Playing with Weact STM32H562RGT6

[lesept]

Thanks
When I add these lines to your Whetstone benchmark, I get : 650671
Does it mean I have around 630 kB free RAM?

When I compile using the Arduino IDE, I have the following message:

Sketch uses 27752 bytes (2%) of program storage space. Maximum is 1048576 bytes.
Global variables use 24976 bytes (3%) of dynamic memory, leaving 630384 bytes for local variables. Maximum is 655360 bytes.

The numbers are similar.
Now when I compile my bigger sketch, I have this:

Sketch uses 48892 bytes (4%) of program storage space. Maximum is 1048576 bytes.
Global variables use 26460 bytes (4%) of dynamic memory, leaving 628900 bytes for local variables. Maximum is 655360 bytes.

So, I don't see any memory problem that could explain why the sketch doesn't run, and why the STM32 does not create a COM port for the IDE.