Resolved! STM32 from ground up: NVIC active bit, Processor Modes (FIQ, IRQ, ABT, USR...)
Context: I'm writing my first STM32 "from the ground up" project. Notepad++ and GCC in command line (Windows 10) are my IDE. I've never done this before, so I'm learning ropes, taking first look into assembly (but keeping own assembly to a minimum, C...