The PA.8 pin of STM32 has a multiplexing function - clock output (MCO), which can output the internal clock of STM32 through PA.8.
Operation process:
1) Set PA.8 to multiplexed Push-Pull mode.
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
2) Select the output clock source.
The clock selection is controlled by the MCO[2:0] bit in the clock configuration register (RCC_CFGR).
RCC_MCOConfig(RCC_MCO);
Parameter RCC_MCO is the internal clock to be output:
RCC_MCO_NoClock --- No clock output
RCC_MCO_SYSCLK --- Output system clock (SysCLK)
RCC_MCO_HSI --- Output internal high-speed 8MHz RC oscillator clock (HSI)
RCC_MCO_HSE --- Output high-speed external clock signal (HSE)
RCC_MCO_PLLCLK_Div2 --- Output PLL multiplied by two-divided clock (PLLCLK/2)
Note: Since the maximum response frequency of the STM32 GPIO output pin is 50MHz, if the output frequency exceeds 50MHz, the output waveform will be distorted.
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