stm32f1 为什么无法清除中断标志位

我秃了，也强了

在用stm32c8t6 做智能车的时候 在做测速模块发现 当只有一个轮子转动时 另一个轮子的还是有速度，且两轮测出来的速度一样
去查寄存器发现竟然清除不掉两个中断标志位，导致中断一直在执行  ！！！弄了好久还是不知道怎么回事？   求大佬告知


测试如图


运行完两行代码后依旧还是1？？？？



附上代码部分
speedtest.c

#include "stm32f10x.h"
#include "speedtest.h"
#include "sys.h"
#include "beep.h"

u16 speedcount_L=0;
u16 speedcount_R=0;
u16 speed_Right=0;
u16 speed_Left=0;

void Speed_Test_Init(u16 arr,u16 psc)
{    //外部中断配置
        GPIO_InitTypeDef GPIO_InitStructure;
        EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
        TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
       
        BEEP_Init();
       
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
       
       
        GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2|GPIO_Pin_1;   
        GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;   
        GPIO_Init(GPIOA,&GPIO_InitStructure);

        GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource2|GPIO_PinSource1); //ÖD¶Ïó3éä

        EXTI_InitStructure.EXTI_Line=EXTI_Line2|EXTI_Line1;  
        EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;   
        EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
        EXTI_InitStructure.EXTI_LineCmd=ENABLE;  
        EXTI_Init(&EXTI_InitStructure);

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

        NVIC_InitStructure.NVIC_IRQChannel=EXTI2_IRQn;  
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;  
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;  
        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;  
        NVIC_Init(&NVIC_InitStructure);

        NVIC_InitStructure.NVIC_IRQChannel=EXTI1_IRQn;  
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;  
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=2;  
        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;  
        NVIC_Init(&NVIC_InitStructure);
       
       
       
  //TIM2
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);//¿aÆôTIM2ê±Öó
       
        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(TIM2,&TIM_TimeBaseStructure);
       
        TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE );
       

        NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;  
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;  
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);  
       
        TIM_Cmd(TIM2, ENABLE);  
}       


void TIM2_IRQHandler()
{
        if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
        {

           TIM_Cmd(TIM2, DISABLE);

    EXTI->IMR&=~(6);   


          speed_Left=speedcount_L*60/20;   //  r/min
          speed_Right=speedcount_R*60/20;   //  r/min

          speedcount_L=0;
          speedcount_R=0;


                if(EXTI_GetITStatus(EXTI_Line2)==SET) EXTI_ClearITPendingBit(EXTI_Line2);    //清除不掉
                if(EXTI_GetITStatus(EXTI_Line1)==SET) EXTI_ClearITPendingBit(EXTI_Line1);
                TIM_ClearITPendingBit(TIM2, TIM_IT_Update);  

                TIM_Cmd(TIM2, ENABLE);
         
                EXTI->IMR|=6;
               
                TIM_SetCounter(TIM2,0x00);

        }
}

void EXTI2_IRQHandler(void)
{
        if(EXTI_GetITStatus(EXTI_Line2)==SET)
  {
                speedcount_L++;
          EXTI_ClearITPendingBit(EXTI_Line2);  
        }
}

void EXTI1_IRQHandler(void)
{
        if(EXTI_GetITStatus(EXTI_Line1)==SET)
  {
                speedcount_R++;
          EXTI_ClearITPendingBit(EXTI_Line1);  
        }
}


main.c

#include "stm32f10x.h"
#include "carwheel.h"
#include "redfollow.h"
#include "speedtest.h"
#include "beep.h"
#include "usart_speed.h"
#include "sys.h"

#define speed_L 400   
#define speed_R 400  

int main(void)
{       
        SystemInit();
         WHEEL_Init();
        Red_Follow_Init();   //红外循迹模块   使用if函数没用中断
         uart_init(115200);
         Speed_Test_Init(9999,7199);  //1s 检测一次速度
         
         while(1)
         {               
                 Red_Follow(speed_L,speed_R);
                 Usart1_Speed();
//        if(speed_R >=4) BEEP=!BEEP;

         }
}

正点原子

帮顶

LcwSwust

奇怪，为啥外中断标志不在外中断服务里清？不清标志的话中断会一直产生如同死循环，导致主循环没机会运行、其它中断也可能没机会运行。