输入捕获中断

hebsjx

TIM_TimeBaseStructure.TIM_Period = 0xFFFF;     //周期0～FFFF
  TIM_TimeBaseStructure.TIM_Prescaler = 5;       //时钟分频
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;   //时钟分割
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//模式
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);//基本初始化

  TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
  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 = 0x4;
  //TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
   TIM_ICInit(TIM2, &TIM_ICInitStructure);        //初始化
  
  /* Select the TIM2 Input Trigger: TI2FP2 */
  TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);    //选择时钟触发源
  /* Select the slave Mode: Reset Mode */
  TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);  //触发方式
  /* Enable the Master/Slave Mode */
  TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);  //启动定时器的被动触发
 
  /* TIM enable counter */
  TIM_Cmd(TIM2, ENABLE);
  /* Enable the CC2 Interrupt Request */
  TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE);
 
/* TIM2 channel 2 pin (PA.01) configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;  //设置TIM2通道输入中断
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; /* Configure the NVIC Preemption Priority Bits[配置优先级组] */
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; 
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   /* Enable the TIM2 gloabal Interrupt [允许TIM2全局中断]*/
  NVIC_Init(&NVIC_InitStructure);
 
TIM2_IRQHandler(void)
{
   /* Clear TIM2 Capture compare interrupt pending bit */
  TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);
  /* Get the Input Capture value */
  IC2Value = TIM_GetCapture2(TIM2);
  if (IC2Value != 0)
  {
    /* Duty cycle computation */
    DutyCycle = (TIM_GetCapture1(TIM2) * 100) / IC2Value;
    /* Frequency computation */
    Frequency = 72000000 / IC2Value;
  }
  else
  {
    DutyCycle = 0;
    Frequency = 0;
  }
}
 
请大家帮忙分析我的程序为什么进不了捕获中断

安

TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
这里配置的1通道，
* TIM2 channel 2 pin (PA.01) configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
这里触发的是2通道。
你把这个修改相对应了，试试。

hebsjx

设置版主要求的设置了，从pin (PA.01)管脚直接用信号发生器输入50赫兹的方波，可就是进入中断！！

安

可就是不进入中断吗？还是进入中断？

hebsjx

调试程序时，进不到中断程序里。
 

安

看不到，你把你的图片截好发上来。

hebsjx

程序编译 没有 报错误 !但 近不了中断子程序 里!!请版住 帮忙分析 QQ 624364968

安

你把GPIO部分去掉，如果还不行，就按例程改成输出，如果输出没有问题，那么就直接在输出的基础上该位输入，我看了一下，这个不需要设置gpio