如题，今天使用STM32的编码器接口，因电路板中A和B接反，正好在定时器中的设置可以把IC1 映射在TI2上；IC2 映射在TI1上，经多次测试还是未成功，依然是IC1 映射在TI1上；IC2 映射在TI2上.
有用过对调的朋友帮忙看看，是我设置问题还是st的这个功能就是没有？

1. void TIM4_InputCapture_Init(void)
   
2. {
   
3.         GPIO_InitTypeDef GPIO_InitStructure;
   
4.         TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
   
5.        
   
6.        
   
7.         RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
   
8.         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );
   
9.        
   
10.         {
    
11.                 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    
12.                 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    
13.                 GPIO_Init(GPIOB, &GPIO_InitStructure);
    
14. //                GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE);//PB6,7不需要映射
    
15.         }
    
16.         {
    
17.                  TIM_DeInit(TIM4);
    
18.                  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);  
    
19.                  TIM_TimeBaseStructure.TIM_Prescaler = 1;
    
20.                  TIM_TimeBaseStructure.TIM_Period = 0xFFFE;
    
21.                  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    
22.                  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    
23.                  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
    
24.                  
    
25.                  TIM_EncoderInterfaceConfig(TIM4, TIM_EncoderMode_TI1, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
    
26.              
    
27.                  TIM_ClearFlag(TIM4, TIM_FLAG_Update);//清除中断标志
    
28.                  TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);//使能/失能相应中断
    
29.                  
    
30.                  TIM4->CNT = 0;
    
31.                  TIM_Cmd(TIM4, ENABLE);
    
32.         }
    
33. }

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1. void TIM_EncoderInterfaceConfig(TIM_TypeDef* TIMx, uint16_t TIM_EncoderMode,
   
2.                                 uint16_t TIM_IC1Polarity, uint16_t TIM_IC2Polarity)
   
3. {
   
4.   uint16_t tmpsmcr = 0;
   
5.   uint16_t tmpccmr1 = 0;
   
6.   uint16_t tmpccer = 0;
   
7.    
   
8.   /* Check the parameters */
   
9.   assert_param(IS_TIM_LIST5_PERIPH(TIMx));
   
10.   assert_param(IS_TIM_ENCODER_MODE(TIM_EncoderMode));
    
11.   assert_param(IS_TIM_IC_POLARITY(TIM_IC1Polarity));
    
12.   assert_param(IS_TIM_IC_POLARITY(TIM_IC2Polarity));
    
13. 
    
14.   /* Get the TIMx SMCR register value */
    
15.   tmpsmcr = TIMx->SMCR;
    
16.   
    
17.   /* Get the TIMx CCMR1 register value */
    
18.   tmpccmr1 = TIMx->CCMR1;
    
19.   
    
20.   /* Get the TIMx CCER register value */
    
21.   tmpccer = TIMx->CCER;
    
22.   
    
23.   /* Set the encoder Mode */
    
24.   tmpsmcr &= (uint16_t)(~((uint16_t)TIM_SMCR_SMS));
    
25.   tmpsmcr |= TIM_EncoderMode;
    
26.   
    
27.   /* Select the Capture Compare 1 and the Capture Compare 2 as input */
    
28.   tmpccmr1 &= (uint16_t)(((uint16_t)~((uint16_t)TIM_CCMR1_CC1S)) & (uint16_t)(~((uint16_t)TIM_CCMR1_CC2S)));
    
29. //  tmpccmr1 |= TIM_CCMR1_CC1S_0 | TIM_CCMR1_CC2S_0;
    
30.   tmpccmr1 |= TIM_CCMR1_CC1S_1 | TIM_CCMR1_CC2S_1;//这段没有是我根据数据手册中添加的
    
31.   
    
32.   /* Set the TI1 and the TI2 Polarities */
    
33.   tmpccer &= (uint16_t)(((uint16_t)~((uint16_t)TIM_CCER_CC1P)) & ((uint16_t)~((uint16_t)TIM_CCER_CC2P)));
    
34.   tmpccer |= (uint16_t)(TIM_IC1Polarity | (uint16_t)(TIM_IC2Polarity << (uint16_t)4));
    
35.   
    
36.   /* Write to TIMx SMCR */
    
37.   TIMx->SMCR = tmpsmcr;
    
38.   /* Write to TIMx CCMR1 */
    
39.   TIMx->CCMR1 = tmpccmr1;
    
40.   /* Write to TIMx CCER */
    
41.   TIMx->CCER = tmpccer;
    
42. }

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