pwm的输入捕获小问题

32永不放弃

我的输入捕获程序能在LCD正确的显示PWM的占空比，还有频率。可是一直循环在中断里面死循环，跳不出来！代码如下

void Capture_Init(u16 arr,u16 psc)
{
 
 GPIO_InitTypeDef GPIO_InitStructure;
 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 NVIC_InitTypeDef NVIC_InitStructure;
 TIM_ICInitTypeDef  TIM_ICInitStructure;
 
 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD  | RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟使能
 GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE);

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;     //PB9 输入
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;   //上拉输入
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOD, &GPIO_InitStructure);
  GPIO_SetBits(GPIOD,GPIO_Pin_13); //初始化GPIOB.9
 
 TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值  80K
 TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  不分频
   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式

 TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx

 TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;  // 选择输入端 IC4映射到TI4上
   TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
   TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
   TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;  //配置输入分频,不分频
   TIM_ICInitStructure.TIM_ICFilter = 0x04;//IC4F=0011 配置输入滤波器 8个定时器时钟周期滤波
 TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;/* 每次检测到捕获输入就触发一次捕获 */
   TIM_ICInit(TIM4, &TIM_ICInitStructure);//初始化定时器输入捕获通道

  

 TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;  // 选择输入端 IC4映射到TI4上
   TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //上升沿捕获
   TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_IndirectTI;
   TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;  //配置输入分频,不分频
   TIM_ICInitStructure.TIM_ICFilter = 0x04;//IC4F=0011 配置输入滤波器 8个定时器时钟周期滤波
 TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;/* 每次检测到捕获输入就触发一次捕获 */
   TIM_ICInit(TIM4, &TIM_ICInitStructure);//初始化定时器输入捕获通道

 
 NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;  //TIM3中断
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
 NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

 TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2);                //选择IC2为始终触发源
 TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);//TIM从模式：触发信号的上升沿重新初始化计数器和触发寄存器的更新事件
 TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable); //选择主从模式，主从模式使能，启动定时器的被动触发

 TIM_Cmd(TIM4,ENABLE );  //使能定时器4  
 TIM_ITConfig( TIM4,TIM_IT_Update,ENABLE);//允许更新中断 ,允许CC4IE捕获中断
    
}

 

void TIM4_IRQHandler(void)
{
    float temp,temp2,k1;
 u8 temp1,k2;
  IC1Value = TIM4->CCR1;//读取CCR1也可以清CC1IF标志位
  IC1Value=IC1Value+1;
  IC2Value = TIM4->CCR2;//读取CCR1也可以清CC2IF标志位
 
  if (IC2Value != 0)
  {
  
    DutyCycle =  (float)IC1Value/IC2Value;         //读取IC1捕获寄存器的值，并计算占空比

  
    Frequency = 72000000 / IC2Value;                                          //计算PWM频率。
  }

  else
  {
    DutyCycle = 0;
    Frequency = 0;
  }
 
 LCD_ShowString(0,240,"c2"); 
 LCD_ShowNum(20,240,IC2Value,6,16);//显示电压值
 LCD_ShowString(0,260,"c1:");
 LCD_ShowNum(20,260,IC1Value,6,16);//显示电压值  
 LCD_ShowString(0,280,"p_l:"); 

                              
   LCD_ShowNum(20+20,280,Frequency,6,16);//显示电压值

 LCD_ShowString(0,300,"z_k:");
 k1=DutyCycle*100;
 k2=k1;
 LCD_ShowNum(10+30,300,k2,2,16);
 k1=k1-k2;
 k1=k1*100;
 LCD_ShowString(26+30,300,".");
 LCD_ShowNum(32+30,300,k1,2,16);
 LCD_ShowString(48+30,300,"%");

 LCD_ShowNum(130,150+20,led0pwmval,4,16);//显示电压值
 temp=(float)led0pwmval/900;
 temp2=temp*100;
 temp1=temp2;
 LCD_ShowNum(10+30,150+20,temp1,2,16);
 temp2=temp2-temp1;
 temp1=temp2*100;
 LCD_ShowString(26+30,150+20,".");
 LCD_ShowNum(32+30,150+20,temp1,2,16);
 LCD_ShowString(48+30,150+20,"%");
 delay_ms(2000); 
 LED4=!LED4;
 TIM4->SR&=~(1<<1);//清除中断标志位
}
有哪位高手能帮我找出能执行main函数的while里面的代码段，即让程序能跳出，死循环。  谢了，，，，，，，，，，，，，，，，，，，

正点原子

回复【楼主位】32永不放弃:
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你不要在中断里面做这么多代码,应该就好了.