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);
}
