想要用中断捕获输入信号的第一次下降沿，为什么没反应？？

ggec

#include "exti.h"

#include "led.h"

#include "delay.h"

#include "usart.h"

#include "lcd.h"

u32 T1,T2,T3,T4;

char num;

void EXTI1_IRQHandler(void)

{

EXTI->R=1<<1;

LED0=!LED0;

T1=TIM2->CNT;

EXTI->IMR=0<<1;//屏蔽外部中断

num++;

// LCD_ShowNum(30,50,T1,5,16);

}

void EXTI2_IRQHandler(void)

{

EXTI->R=1<<2;

// LED1=!LED1;

  T2=TIM2->CNT;

// LCD_ShowNum(30,70,T2,5,16);

EXTI->IMR=0<<2;//屏蔽外部中断

num++;

}

void EXTI3_IRQHandler(void)

{

EXTI->R=1<<3;

// LED0=!LED0;

// LED1=!LED1;

T3=TIM2->CNT;

// LCD_ShowNum(30,90,T3,5,16);

EXTI->IMR=0<<3;//屏蔽外部中断

num++;

}

void EXTI4_IRQHandler(void)

{

EXTI->R=1<<4;

T4=TIM2->CNT;

EXTI->IMR=0<<4;//屏蔽外部中断

num++;

// LCD_ShowNum(30,110,T4,5,16);

}

void EXTIX_Init(void)

{

RCC->APB2ENR|=1<<2;     //使能PORTA时钟

JTAG_Set(JTAG_SWD_DISABLE);//关闭JTAG和SWD   

GPIOA->CRL&=0XFFF0000F;//PA1-4设置成输入  

GPIOA->CRL|=0X00088880;   

  

GPIOA->ODR|=1<<1;   //PA1-4上拉

GPIOA->ODR|=1<<2;   //

GPIOA->ODR|=1<<3;   //PA1-4上拉

GPIOA->ODR|=1<<4;   //

Ex_NVIC_Config(GPIO_A,1,FTIR);//下降沿触发

Ex_NVIC_Config(GPIO_A,2,FTIR);//下降沿触发

Ex_NVIC_Config(GPIO_A,3,FTIR);//下降沿触发

Ex_NVIC_Config(GPIO_A,4,FTIR);//下降沿触发

MY_NVIC_Init(2,2,EXTI1_IRQChannel,2);//抢占2，子优先级2，组2

MY_NVIC_Init(2,2,EXTI2_IRQChannel,2);//抢占2，子优先级1，组2   

MY_NVIC_Init(2,1,EXTI3_IRQChannel,2);//抢占2，子优先级1，组2   

MY_NVIC_Init(2,1,EXTI4_IRQChannel,2);//抢占2，子优先级1，组2   

}

void display(void)

{

LCD_ShowNum(30,50,T1,5,16);

LCD_ShowNum(30,70,T2,5,16);

LCD_ShowNum(30,90,T3,5,16);

LCD_ShowNum(30,110,T4,5,16);

EXTI->IMR=1<<1; //开启外部中断

EXTI->IMR=1<<2;

EXTI->IMR=1<<3;

EXTI->IMR=1<<4;

}

void panduan(void)

{

if(num==4)

{

TIM2->CR1&=0xFE; //关闭TIM2

TIM2->CNT=0; //清零TIM2

num=0;

display();

}

}

int main(void)

{

  Stm32_Clock_Init(9); //系统时钟设置

delay_init(72);      //延时初始化

uart_init(72,9600);   //串口初始化 

LED_Init();   //初始化与LED连接的硬件接口

KEY_Init(); //按键初始化

LCD_Init();

POINT_COLOR=RED;

EXTIX_Init(); //外部中断初始化

Timer2_Init(9999,7199);//Tout=((arr+1)*(psc+1))/Tclk    5000*7200/72000000=0.5ms //Tout=1s

while(1)

{  

panduan();

}  

}

ST-FAE-SALE

捕获寄存器当中有数据了嘛？

ggec

回复【2楼】ST-FAE-SALE:
---------------------------------
似乎PA4能够循环中断，别的只能计算一次中断。。

正点原子

EXTI->IMR=0<<4;//屏蔽外部中断

你这种写法,把所有的中断都给屏蔽了...

ggec

回复【4楼】正点原子:
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就是检测一次中断后就屏蔽，满足条件后，在循环里面开启啊。