STM32F407输入捕获实验

FaceLessVoid

原子哥！
    我根据输入捕获实验修改了程序，IO口改成PA1，采用TIM2_CH2测速输入捕获实验，其他代码不改变，烧到板子上测试，串口一直打印HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:0 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
HIGH:1 us
跟实验例程不一致啊，折腾了两天都不知道问题出在哪里，请大哥帮忙看一下谢谢！

TIM_ICInitTypeDef  TIM2_ICInitStructure;

//?¨?±?÷5?¨??1????????????
//arr??×?????×°??(TIM2,TIM5??32????!!)
//psc???±???¤·?????
void TIM2_CH2_Cap_Init(u32 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;


RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);   //TIM5?±??????    
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //????PORTA?±??

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //GPIOA0
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//????????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //????100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //???ì????????
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; //????
GPIO_Init(GPIOA,&GPIO_InitStructure); //??????PA0

GPIO_PinAFConfig(GPIOA,GPIO_PinSource1,GPIO_AF_TIM2); //PA0???????¨?±?÷5
  
 
TIM_TimeBaseStructure.TIM_Prescaler=psc;  //?¨?±?÷·???
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //?ò??????????
TIM_TimeBaseStructure.TIM_Period=arr;   //×?????×°????
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; 

TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);


//??????TIM5????????????
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2; //CC1S=01 ?????????? IC1??????TI1??
TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //??????????
TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //??????TI1??
TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //????????·???,??·??? 
TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 ???????????¨?÷ ?????¨
TIM_ICInit(TIM2, &TIM2_ICInitStructure);

TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC2,ENABLE);//???í?ü?????? ,???íCC1IE???????? ???????¨?±?÷?????????¨??

    TIM_Cmd(TIM2,ENABLE ); //?????¨?±?÷5

 
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//??????????3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =0; //×???????3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??????
NVIC_Init(&NVIC_InitStructure); //?ù?????¨????????????VIC?????÷??


}
//????×???
//[7]:0,??????????????;1,??????????????.
//[6]:0,????????????????;1,??????????????????.
//[5:0]:???????????ó??????????(????32???¨?±?÷????,1us?????÷??1,?????±??:4294??)
u8  TIM2CH2_CAPTURE_STA=0; //????????×???    
u32 TIM2CH2_CAPTURE_VAL; //??????????(TIM2/TIM5??32??)
//?¨?±?÷5????·??????ò  
void TIM2_IRQHandler(void)
{    

  if((TIM2CH2_CAPTURE_STA&0X80)==0)//????????????
{
if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)//????
{     
if(TIM2CH2_CAPTURE_STA&0X40)//??????????????????
{
if((TIM2CH2_CAPTURE_STA&0X3F)==0X3F)//?????????¤??
{
TIM2CH2_CAPTURE_STA|=0X80; //±ê????????????????
TIM2CH2_CAPTURE_VAL=0XFFFFFFFF;
}else TIM2CH2_CAPTURE_STA++;
}  
}
if(TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET)//????1·??ú????????
{
if(TIM2CH2_CAPTURE_STA&0X40) //????????????????
{  
TIM2CH2_CAPTURE_STA|=0X80; //±ê?????????????????????????í
   TIM2CH2_CAPTURE_VAL=TIM_GetCapture2(TIM2);//?????±?°????????.
TIM_OC2PolarityConfig(TIM2,TIM_ICPolarity_Rising); //CC1P=0 ?è??????????????
}else   //????????,????????????????
{
TIM2CH2_CAPTURE_STA=0; //????
TIM2CH2_CAPTURE_VAL=0;
TIM2CH2_CAPTURE_STA|=0X40; //±ê????????????????
TIM_Cmd(TIM2,DISABLE ); //??±??¨?±?÷5
TIM_SetCounter(TIM2,0);
TIM_OC2PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 ?è??????????????
TIM_Cmd(TIM2,ENABLE ); //?????¨?±?÷5
}    
}           
  }
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_Update); //????????±ê????
}

正点原子

仿真调试一下.