用的是TIM4的输入捕获通道2和3，为什莫只有通道3正常，通道2不正常

2019-08-19 17:01发布

#include<printf.h>
#include<systick.h>
#include<time54cap.h>
#include<ceju.h>
#include<printf.h>

int main()
{
u8 a=10;
printf_init(115200);

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
TIM4_Cap_Init(0XFFFF,72-1);

   printf("¾ààëêÇ￡o%d ", a);


   while(1)
{

printf("7距离是：o%d ", cedistance7());

printf("6距离是：o%d ", cedistance6());

delay_ms(500);

}
}
//////////////////////////////////////////////////////////////////////////////////////////////////
#include<time54cap.h>
void TIM4_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef  TIM4_ICInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_7|GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_ResetBits(GPIOB,GPIO_Pin_7|GPIO_Pin_8);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler =psc;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

      TIM4_ICInitStructure.TIM_Channel = TIM_Channel_2;
   TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
   TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
   TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
   TIM4_ICInitStructure.TIM_ICFilter = 0x00;
   TIM_ICInit(TIM4, &TIM4_ICInitStructure);

   TIM4_ICInitStructure.TIM_Channel = TIM_Channel_3;
   TIM4_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
   TIM4_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
   TIM4_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
   TIM4_ICInitStructure.TIM_ICFilter = 0x00;
   TIM_ICInit(TIM4, &TIM4_ICInitStructure);


NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

TIM_ITConfig(TIM4, TIM_IT_CC2|TIM_IT_CC3,ENABLE);
TIM_Cmd(TIM4,ENABLE );

}
///////////////////////////////////////////////////////////////////////////////////////////////
#include<ceju.h>
extern u8  TIM4CH2_CAPTURE_STA;
extern u16 TIM4CH2_CAPTURE_VAL;

extern u8  TIM4CH3_CAPTURE_STA;
extern u16 TIM4CH3_CAPTURE_VAL;

u16 cedistance6()
{    u16 distance;
while((TIM4CH2_CAPTURE_STA&0X80)==0);
distance=(17*TIM4CH2_CAPTURE_VAL)/1000;
TIM4CH2_CAPTURE_STA=0;
return  distance;
}
u16 cedistance7()
{    u16 distance;
while((TIM4CH3_CAPTURE_STA&0X80)==0);
distance=(17*TIM4CH3_CAPTURE_VAL)/1000;
TIM4CH3_CAPTURE_STA=0;
return  distance;
}
//////////////////////////////////////////////////////////////////////////////////////////
#include "stm32f10x_it.h"

u8  TIM4CH2_CAPTURE_STA=0;
u16 TIM4CH2_CAPTURE_VAL;
u8  TIM4CH3_CAPTURE_STA=0;
u16 TIM4CH3_CAPTURE_VAL;

void TIM4_IRQHandler(void)
{

if((TIM4CH2_CAPTURE_STA&0X80)==0)
{

   if (TIM_GetITStatus(TIM4, TIM_IT_CC2) != RESET)
   {
if(TIM4CH2_CAPTURE_STA&0X40)
{
TIM4CH2_CAPTURE_STA|=0X80;
TIM4CH2_CAPTURE_VAL=TIM_GetCapture2(TIM4);
TIM_OC2PolarityConfig(TIM4,TIM_ICPolarity_Rising);
}else
{
TIM4CH2_CAPTURE_STA=0;
TIM4CH2_CAPTURE_VAL=0;
TIM_SetCounter(TIM4,0);
TIM4CH2_CAPTURE_STA|=0X40;
TIM_OC2PolarityConfig(TIM4,TIM_ICPolarity_Falling);
}
}
}

if((TIM4CH3_CAPTURE_STA&0X80)==0)
{

   if (TIM_GetITStatus(TIM4, TIM_IT_CC3) != RESET)
   {
if(TIM4CH3_CAPTURE_STA&0X40)
{
TIM4CH3_CAPTURE_STA|=0X80;
TIM4CH3_CAPTURE_VAL=TIM_GetCapture3(TIM4);
TIM_OC3PolarityConfig(TIM4,TIM_ICPolarity_Rising);
}else
{
TIM4CH3_CAPTURE_STA=0;
TIM4CH3_CAPTURE_VAL=0;
TIM_SetCounter(TIM4,0);
TIM4CH3_CAPTURE_STA|=0X40;
TIM_OC3PolarityConfig(TIM4,TIM_ICPolarity_Falling);
}
}
}

TIM_ClearITPendingBit(TIM4,TIM_IT_CC2|TIM_IT_CC3);

}

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