这应该是笔误吧？

13128927795

//初始化通道2 
  TIM5_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC1S=01 选择输入端 IC2映射到TI5上
  TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
  TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; 
  TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频 
  TIM5_ICInitStructure.TIM_ICFilter = 0x03;//IC2F=0011 配置输入滤波器 8个定时器时钟周期滤波
  TIM_ICInit(TIM5, &TIM5_ICInitStructure);//初始化I5 IC2

    TIM_Cmd(TIM5,ENABLE ); //使能定时器5

------------------------------------------------------------------------
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC1S=01 选择输入端 IC2映射到TI5上
这句话应该是选择输入端 IC2映射到TI2上吧？？

正点原子

是的....