PWM捕获输入试验问题？

wangsongboke@16

配置TIM3 PC7作为输出PWM信号，占空比50%,脉宽2.0MS。配置TIM5 PA0作为捕获输入，通过串口将高电平时钟输出正常。
然后更改TIM5 PA1作为捕获输入，配置后引起TIM3 PC7端PWM输出变化，我用LED灯测试，正常输出为交替亮灭速度较慢，更改TIM5配置后LED非常快速的交替亮灭不知道怎么回事情，请高手解答，在线等。。。。。。。。
配置如下：
IM_ICInitTypeDef  TIM5_ICInitStructure;

void TIM5_Cap_Init(u16 arr,u16 psc)
{  
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); 

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_1;  
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; 
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_ResetBits(GPIOA,GPIO_Pin_1);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;  
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; 
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); 
  
//??????TIM5????????????
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_2;
  TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
  TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; 
  TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; 
  TIM5_ICInitStructure.TIM_ICFilter = 0x00;
  TIM_ICInit(TIM5, &TIM5_ICInitStructure);

//????·?×é??????
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; 
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure); 

TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC2,ENABLE);

    TIM_Cmd(TIM5,ENABLE ); 
   


}

u8  TIM5CH1_CAPTURE_STA=0; //????????×???    
u16 TIM5CH1_CAPTURE_VAL; //??????????
 
//?¨?±?÷5????·??????ò  
void TIM5_IRQHandler(void)
{ 

  if((TIM5CH1_CAPTURE_STA&0X80)==0)
{  
if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
 
{    
if(TIM5CH1_CAPTURE_STA&0X40)
{
if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)
{
TIM5CH1_CAPTURE_STA|=0X80;
TIM5CH1_CAPTURE_VAL=0XFFFF;
}else TIM5CH1_CAPTURE_STA++;
}  
}
if (TIM_GetITStatus(TIM5, TIM_IT_CC2) != RESET)
{
if(TIM5CH1_CAPTURE_STA&0X40) 
{  
TIM5CH1_CAPTURE_STA|=0X80; 
TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
  TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); 
}else 
{
TIM5CH1_CAPTURE_STA=0; 
TIM5CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM5,0);
TIM5CH1_CAPTURE_STA|=0X40;
  TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);
}    
}           
  }
 TIM_ClearITPendingBit(TIM5, TIM_IT_CC2|TIM_IT_Update);
 
}

正点原子

用示波器看下波形吧，比较好找问题。