GitHub repository: michto01/Stm32-RCC-library
Description: RCC bare metal drivers for Stm32 f4 family of microcontrollers written in C . The driver contains apis for the User to set clock speed for AHB , APB1 , APB2 bus .The driver also allows changing the APB and AHB bus frequency on the fly , and also contains apis for to get the current frequency at which AHB and APB bus is  running at