求助（写错了是4K）

Fanz

各位大虾
我正在做个捕捉的东西，输入源PA0（4.000KHZ）左右的周期性方波(不好意思写错了，是4K，看错了示波器)
通过这个捕捉得出的值来自动调整另一个端口的输出是频率是输入源PA0的8倍（25US）左右（用另一定时器发生）

有点类似类倍频器。

不知怎么配置，配了好多次，实在是没办法

Fanz

用PWM输入或捕捉
我试过保存1000个数据，但仿真出来的结果是一开始的几十个数据为0XFFFF，之后有几十个数据貌似正确，之后就是0000，FFFF，我是按DATASHEET配的

Fanz

 void TIM2_Configuration(void)
{
    TIM_ICInitTypeDef TIM_ICInitStructure;
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x0; 
    TIM_ICInit(TIM2, &TIM_ICInitStructure);

    TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);

    //TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);   //选择时钟触发源
    //TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);//触发方式
    //TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);

    //TIM_PrescalerConfig(TIM2, 72-1, TIM_PSCReloadMode_Immediate);//72M/72=1000K
}



void TIM2_IRQHandler(void)    
{
 if(TIM_GetITStatus(TIM2, TIM_IT_CC1) == SET)
   {
     /* Clear TIM2 Capture compare interrupt pending bit */
  GPIO_WriteBit(BU,(BitAction)(1 -GPIO_ReadOutputDataBit(BU)));
     TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
     if(CaptureNumber == 0)
      {
        /* Get the Input Capture value */
        IC1ReadValue1 = TIM_GetCapture1(TIM2);
        CaptureNumber = 1;
      }
     else
   {
    if(CaptureNumber == 1)
        {
          /* Get the Input Capture value */
          IC1ReadValue2 = TIM_GetCapture1(TIM2);
         
          /* Capture computation */
          if (IC1ReadValue2 > IC1ReadValue1)
           {
             Capture = (IC1ReadValue2 - IC1ReadValue1);
           }
          else
           {
             Capture = ((0xFFFF - IC1ReadValue1) + IC1ReadValue2);
           }
          /* Frequency computation */
          //TIM2Freq = (uint32_t) SystemCoreClock / Capture;
          CaptureNumber = 0;

       tim2_temp2++;
       if(tim2_temp2<1000)
        {cc2[tim2_temp2]=Capture;}
       else
        {tim2_temp2++;}
       exti0_temp=Capture/2;
        }
   }
   }
}

Fanz

TIM_TimeBaseStructure.TIM_Period = 0xFFFF;     //周期0～FFFF 
TIM_TimeBaseStructure.TIM_Prescaler =(72-1);       //时钟分频 
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV4;   //时钟分割 
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);//基本初始化


是否还要设TIM2的方式???

正点原子

4M？另外一个定时器输出是这个的4倍？那就是16M方波输出？
STM32的定时器输出不了呢...

Fanz

没有人在吗