Arduino for STM32

Thanks for Your hint.
I totally overlooked it
I 've corrected it and it is working now.

Hello All,

I need your support in solving the following issue:
For my project I use the STM32F301K8U6 chip. In the application I need 0,1s timing, therefore I decided to use the HardwareTimer library.
To check the HW, I uploaded the simplest provided HarwareTimer example, that blinks an LED on pin ...