STM32F030C8T6的定时器怎么不准【解决】

 if (HSEStatus == (uint32_t)0x01)

  {

    /* Enable Prefetch Buffer and set Flash Latency */

    FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;

 

    /* HCLK = SYSCLK */

    RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;

      

    /* PCLK = HCLK */

    RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE_DIV2;  //    //24MHZ



    /* PLL configuration = HSE * 6 = 48 MHz */

    RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));

    RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_PREDIV1 | RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLMULL6);   

            

    /* Enable PLL */

    RCC->CR |= RCC_CR_PLLON;

void TIM_Config(void)

{

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

    /* TIM3 clock enable */

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

  /* Compute the prescaler value */

  PrescalerValue = (uint16_t) (SystemCoreClock  / 1000000) - 1;

  /* Time base configuration */

  TIM_TimeBaseStructure.TIM_Period = 1;  //1 u second

  TIM_TimeBaseStructure.TIM_Prescaler = 23;//PrescalerValue;

  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_Cmd(TIM3, DISABLE);

}



void TimeDelay1us(uint16_t Times)

{

  TIM3->CR1 |= TIM_CR1_CEN;  //启动定时器

  while(Times--)

  {

     while((TIM3->SR & TIM_FLAG_Update) == RESET);

         TIM3->SR &= ~TIM_FLAG_Update;

  }

   TIM3->CR1 &= ~TIM_CR1_CEN;  //关闭定时器

}



void Delay(uint16_t Times1)

{

        uint16_t dd,count;

        for(count=0;count<Times1;count++)

        {

             for(dd=1;dd<1000;dd++)

             TimeDelay1us(1);

        }        

        

}



void delay_us(uint16_t Times2)

{

          uint16_t count;

        for(count=0;count<Times2;count++)

        {

              TimeDelay1us(1);

        }        

}



void delay_ms(uint16_t Times3)

{

          uint16_t count;

          for(count=0;count<Times3;count++)

          Delay(1);

}