LED blink example for the STM32F446RE (NUCLEO-F446RE board).

The project uses simple register-level code, a custom startup file and a linker script.

• MCU: STM32F446RE
• Board: NUCLEO-F446RE
• LED: User LED on PA5

baremetal-stm32-blinky/
├── Makefile
├── ld/
│   └── stm32f446xe_flash.ld
├── src/
│   ├── main.c
│   ├── init.c
│   └── startup/
│       └── startup_stm32f446xx.s
└── include/
    └── stm32f4xx.h