STM32编码器模式捕获代码有问题（附自己写的编码器模式配置错误代码）

Question

STM32F4系列，自己配置了编码器模式的代码，想捕获外部自带编码器的电机的编码器输出脉冲，但无法捕获到，程序也没有报错，手动转电机后，用仿真器观察对应定时器CNT的值，没有任何变化一直为0，困扰了好几天，有人知道吗orz？
（使用TIM5的12通道，对应通道12引脚为PA1和PA0）

void Encoder_config(void)
{

    /*              配置输入通道CH1,CH2             */        
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); 
    GPIO_InitStructure.GPIO_Mode =GPIO_Mode_IN;    
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//换成了浮空输入试过也不行
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;    
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    /*              配置TIM5时基结构体            */
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = 4*11*168-1;//4倍频*编码器分辨率*电机减速比-1 
    TIM_TimeBaseStructure.TIM_Prescaler =0;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; 
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
    
    /*              配置TIM5输入捕获结构体            */
    TIM_ICInitTypeDef  TIM_ICInitStructure;
    TIM_ICInitStructure.TIM_Channel = TIM_Channel_1| TIM_Channel_2;
  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(TIM5,&TIM_ICInitStructure);
    
    /*              配置编码器模式为TI12            */
    TIM_EncoderInterfaceConfig(TIM5, TIM_EncoderMode_TI12,TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
    
    /*              设置TIM5中断              */
    TIM_ClearFlag(TIM5, TIM_FLAG_Update);
    TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE);
    TIM_SetCounter(TIM5,0);
    TIM_Cmd(TIM5, ENABLE);
    TIM_ClearITPendingBit(TIM5 , TIM_IT_Update);

    /*              设置TIM5中断优先级              */
    NVIC_InitTypeDef NVIC_InitStructure; 
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);        
  NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;     
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;     
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;    
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

Answer 1

// GPIO选择复用模式
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;