STM32 TIM4的输入捕获模式捕获中断只能进一次，求救！

phinexapple · 发表于 2016-8-3 23:13:31

void TIM_Init( void )
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init( GPIOB, &GPIO_InitStructure);
            RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 , ENABLE);
TIM_InternalClockConfig(TIM4);
TIM_TimeBaseStructure.TIM_Prescaler = 72-1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_ClockDivision          = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity          = TIM_ICPolarity_Falling;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_ICInit(TIM4,&TIM_ICInitStructure);
            TIM_Cmd(TIM4,ENABLE);
         TIM_ITConfig( TIM4,TIM_IT_Update|TIM_IT_CC1,ENABLE);
         }
NVIC的配置就不贴了，现在能进到TIM4的中断一次，中断函数如下所示：
  void TIM4_IRQHandler(void)
{
if((TIM4CH1_CAPTURE_STA&0X40)==0)
{
   if(TIM_GetITStatus(TIM4,TIM_IT_CC1) !=RESET)
      {
         if(TIM4CH1_CAPTURE_STA & 0x40)
         {
            TIM4CH1_CAPTURE_STA|=0X80;
            TIM4CH1_CAPTURE_VAL = TIM_GetCounter(TIM4);
            //TIM_OC1PolarityConfig(TIM4,TIM_ICPolarity_Falling);
         }
         else
         {
            TIM4CH1_CAPTURE_STA=0;
            TIM4CH1_CAPTURE_VAL=0;

            TIM_SetCounter(TIM4,0);
            TIM4CH1_CAPTURE_STA|=0X40;
            //TIM_OC1PolarityConfig(TIM4,TIM_ICPolarity_Rising);

         }
      }

}
TIM_ClearITPendingBit(TIM4,TIM_IT_CC1|TIM_IT_Update);
}
先不管更新中断，现在的捕获中断我初始设置为下降沿触发，初次是能进的，但只能进一次，后续再不能进入，请高手指教，谢谢！