STM32F103 TIM1 单脉冲输入的问题

kangup2015

小弟最近一个项目用到单脉冲输入 因为IO的问题 用了TIM1 发现怎么调单脉冲模式都没有输出波形 之前是用的TIM4 都没有问题的 还请做过的大神指点迷津，感激不尽啊！！
以下是配置代码
TIM_TimeBaseStructure.TIM_Period=8800;//8800;
TIM_TimeBaseStructure.TIM_Prescaler= 71;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;       
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Down;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
                TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
                TIM_OCInitStructure.TIM_Pulse =2000;               
                TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
                TIM_OC2Init(TIM1,&TIM_OCInitStructure);
                TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
                TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
    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 = 0;
    TIM_ICInit(TIM1,&TIM_ICInitStructure);
               
          TIM_SelectOnePulseMode(TIM1, TIM_OPMode_Single);
    TIM_SelectInputTrigger(TIM1, TIM_TS_TI1FP1);
    TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Trigger);
        //        TIM_CtrlPWMOutputs(TIM1, ENABLE);
                TIM_Cmd(TIM1, ENABLE);