Module rcc 

Functions

enable_afio

enable_apb2

Batch-enable APB2 peripherals in a single write. Only safe at init before other peripherals are enabled.

enable_gpio

enable_usart

Enable USART n clock on whichever bus it lives on.

reset_apb2

Pulse-reset all APB2 peripherals (USART1, GPIO, AFIO, etc.) then disable their clocks — restores power-on default state.

usart_apb2_bit

APB2 enable bit for USART n, or 0 if not on APB2.