1: RCC setting uses internal HSI clock, SYSclk 64M MCO output 32M
Keywords：STM32
Reference address：STM32 RCC experiment MCO pin output clock waveform
1：
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
/* RCC system reset(for debug purpose) */
RCC_DeInit(); //??RCC?????÷?is?????±????
/* Enable HSE */
//RCC_HSEConfig(RCC_HSE_ON); //?è???????????§??
RCC_HSEConfig(RCC_HSE_OFF);
RCC_HSICmd(ENABLE); //??????
//RCC_HSICmd(DISABLE); //??????
/* Wait till HSE is ready */ //HSE ?????????§??
//HSEStartUpStatus = RCC_WaitForHSEStartUp(); //????HSE????
while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET)
{
}
// if(HSEStartUpStatus == SUCCESS)
// {
/* HCLK = SYSCLK *///?è??AHB?±??=???????±?? ?¨RCC_SYSCLK_Div1??·?????????
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK *///?è??????APB2?±??(×??ó72MHZ)
RCC_PCLK2Config(RCC_HCLK_Div1); //RCC_HCLK_Div1 ??·?????RCC_HCLK_Div2 2·???
/* PCLK1 = HCLK/2 *///?è??????APB1?±???¨×??ó36MHZ??
RCC_PCLK1Config(RCC_HCLK_Div2);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* PLLCLK = 8MHz * 9 = 72 MHz */
//RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
//?????±????8/2=4M 4*16 = 64 hsi = 64m (MAX)
RCC_PLLConfig(RCC_PLLSource_HSI_Div2 , RCC_PLLMul_16);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
// }
}
2: Set MCO pin PA8
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; // ×???????????50MHz
GPIO_Init(GPIOA, &GPIO_InitStructure);
Note: The A8 pin uses the multiplexed push-pull output mode. When I used the push-pull output, the waveform did not appear. The push-pull output can only output TTL, while the multiplexed push-pull can output the clock waveform.
3: Set up MCO mode
RCC_MCOConfig(RCC_MCO_PLLCLK_Div2); //Because the maximum port speed is 50M, PLL frequency division by 2 is required
2: RCC setting uses external HSE clock, SYSclk 72M MCO output 36M
Just change the RCC settings, and leave the rest unchanged
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Recommended ReadingLatest update time:2024-11-23 13:43
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