Here some bare metal codes for arm-Cortex M4 based stm32f446re microcontroller.
esp8266 microcontroller embedded remote-control microcontrollers firmware stm32 dht22 uart stm32f4 bare-metal am2302 embedded-c uart-interface stm32f446re microcontroller-firmware stm32f446re-nucleo
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Updated
Sep 15, 2023 - Assembly