MCU Peripheral Clock Control

• To use any peripheral, the developer must enable its clock.
• Reset and Clock Control (RCC) engine : Registers to enable clocks for various peripherals.
• Settings in CubeMX changes the RCC Register values.

• Unable to change the register value of the ADC. Because, clock isn't enabled by default.
• ADC is connected to APB-2 bus. In the RCC_APB2_enbler,

We set this register value of ADC1 as 1.

Under RCC Register, we need to enable APB2 bus. Enabling AHB2 bus, won't get you the output :-

Switching to enabling APB2, indeed the CR1 register changes :-

Similarly, for GPIO peripheral, i enabled first AHB1 bus.