Arduino for STM32

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 ...

Thanks for your answer.
Your sketch worked ok. I can see the LED blink and the results of the whetstone benchmark. Using O3, I get up to 377 MFlops.
I actually tried this benchmark on an ESP32-S3, also with O3 option and got 417 MFlops.

Now I want to upload a more complex sketch: it's an ...

Thanks for your answer, but I didn't install the ST tools. So when I try to program from the IDE I get the following error message:
STM32CubeProgrammer not found (STM32_Programmer_CLI.exe).
Please install it or add '<STM32CubeProgrammer path>/bin' to your PATH environment:
https://www.st.com/en ...

Some more information.

Here is the output from dfu-util:

dfu-util 0.11

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2021 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net ...

Hi
I'm new to this board but thanks to your posts, I have succeeded in using it.
https://ae-pic-a1.aliexpress-media.com/kf/S82e4cf75b7754859aaf05159a336f1d1S.png_220x220.png_.avif

However, I have a problem with the serial monitor in the Arduino IDE: sometimes it works sometimes not. More ...