Based on STM32F412, the System Clock is output on PC9. Similarly, other clock functions can also be output on PA8.
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource9,GPIO_AF_MCO);
RCC_MCO2Config(RCC_MCO2Source_SYSCLK, RCC_MCO2Div_4);
The output parameters can be set by calling the RCC_MCO1Config() and RCC_MCO2Config() functions. The explanation of the library functions is very clear and there is no need to repeat them.
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