CMSIS

Demystify C’s most feared concept — pointers — from the core principle of ’typed addresses.’ What casts mean, how memory-mapped I/O connects to pointers, and what CMSIS headers are actually doing. Stop fearing pointers and start using them as a weapon.

From mask/shift basics to the RMW problem to STM32’s elegant BSRR design. Learn to read registers as bit collections, practice register-direct LED blinking through GPIO, and measure the speed difference between HAL and direct register access.