So my problem is happened when I've tried to change configuration of wdog that uses GPT FTM channel. idk if thats a IDE error or configs, but its such a strange thing to have hard fault while using steps, but no error while using instructuion stepping mode. I skipped about half a code succesfully using instructions, but when I'm changing on usual steps its hardfault. Maybe registers will help, but idk how to use them right