STM32F070F6P6选择内部时钟后，外部上电复位，有时点亮不了灯（外部晶振拆了）；（20次有1到2次会出现）使用外部晶振是没有问题的。 配置信息如下： static void SetSysClock(void) {   __IO uint32_t StartUpCounter = 0, HSIStatus = 0;   /* SYSCLK, HCLK, PCLK configuration ----------------------------------------*/ /* Enable HSI*/ //使能内部时钟   RCC->CR |= ((uint32_t)RCC_CR_HSION;   /* Wait till HSI is ready and if Time out is reached exit */ //等待内部时钟起振   do   {    HSIStatus = RCC->CR & RCC_CR_HSIRDY;     StartUpCounter++;     } while((HSIStatus== 0) && (StartUpCounter != HSI_STARTUP_TIMEOUT));   if ((RCC->CR & RCC_CR_HSIRDY) != RESET)   {   HSIStatus = (uint32_t)0x01;   }   else     {   HSIStatus = (uint32_t)0x00;   }     if (HSIStatus == (uint32_t)0x01)   { /* Enable Prefetch Buffer and set Flash Latency */ //flash总线时钟使能     FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY; /* HCLK = SYSCLK *///外设AHB总线时钟等于系统时钟     RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; /* PCLK = HCLK *///外设APB总线时钟等于系统时钟     RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE_DIV1;    /* PLL configuration = HSI/2 * 12= 48 MHz */     RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL));     RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSI_Div2 | RCC_CFGR_PLLMULL12); //RC时钟2分频后 进行12倍频</font> /* Enable PLL *///使能锁相环倍频开关     RCC->CR |= RCC_CR_PLLON; /* Wait till PLL is ready *///等待锁相环就绪     while((RCC->CR & RCC_CR_PLLRDY) == 0)     {     } /* Select PLL as system clock source *///选择锁相环输出时钟作为系统时钟     RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));     RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;    /* Wait till PLL is used as system clock source *///等待锁相环输出时钟已经成为系统时钟     while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_PLL)     {     }   }   else   { /* If HSI fails to start-up, the application will have wrong clock          configuration. User can add here some code to deal with this error */   }   } 有板子的朋友也可以下载HEX试试，PA10上电灯会亮。

似乎没有看到你对PA10管脚的配置，程序没有配置有时候亮也正常，硬件导致的比如电容充放电引起的或者是其它的原因，建议你加上PA10的控制代码，比如你就初始化灭，你再试试复位看会不会亮，如果在亮你先查程序有问题没，如果没问题 肯定就是你硬件有问题

还有就是你的代码背景一抹黑，基本看不清

斯文人 发表于 2019-7-26 10:17
似乎没有看到你对PA10管脚的配置，程序没有配置有时候亮也正常，硬件导致的比如电容充放电引起的或者是其它 ...

是有控制代码的，只是时钟配置，基本配置还是有的
STM32F070F6P6选择内部时钟后，外部上电复位，有时点亮不了灯（外部晶振拆了）；（20次有1到2次会出现）使用外部晶振是没有问题的。
配置信息如下：
static void SetSysClock(void)
{
  __IO uint32_t StartUpCounter = 0, HSIStatus = 0;

  /* SYSCLK, HCLK, PCLK configuration ----------------------------------------*/
/* Enable HSI*/ //使能内部时钟
  RCC->CR |= ((uint32_t)RCC_CR_HSION;

  /* Wait till HSI is ready and if Time out is reached exit */ //等待内部时钟起振
  do
  {
   HSIStatus = RCC->CR & RCC_CR_HSIRDY;
    StartUpCounter++;  
  } while((HSIStatus== 0) && (StartUpCounter != HSI_STARTUP_TIMEOUT));

  if ((RCC->CR & RCC_CR_HSIRDY) != RESET)
  {
  HSIStatus = (uint32_t)0x01;
  }
  else  
  {
  HSIStatus = (uint32_t)0x00;
  }  

  if (HSIStatus == (uint32_t)0x01)
  {
/* Enable Prefetch Buffer and set Flash Latency */ //flash总线时钟使能
    FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;

/* HCLK = SYSCLK *///外设AHB总线时钟等于系统时钟
    RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;

/* PCLK = HCLK *///外设APB总线时钟等于系统时钟
    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE_DIV1;

   /* PLL configuration = HSI/2 * 12= 48 MHz */
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL));
    RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSI_Div2 | RCC_CFGR_PLLMULL12); //RC时钟2分频后 进行12倍频</font>

/* Enable PLL *///使能锁相环倍频开关
    RCC->CR |= RCC_CR_PLLON;

/* Wait till PLL is ready *///等待锁相环就绪
    while((RCC->CR & RCC_CR_PLLRDY) == 0)
    {
    }

/* Select PLL as system clock source *///选择锁相环输出时钟作为系统时钟
    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
    RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;   

/* Wait till PLL is used as system clock source *///等待锁相环输出时钟已经成为系统时钟
    while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_PLL)
    {
    }
  }
  else
  { /* If HSI fails to start-up, the application will have wrong clock
         configuration. User can add here some code to deal with this error */

  }  
}
有板子的朋友也可以下载HEX试试，PA10上电灯会亮。