中断实现三盏灯亮灭

最新推荐文章于 2026-01-08 11:09:44 发布

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本文详细介绍了如何在STM32MP1xx平台中配置GPIO引脚作为按键中断，包括时钟启用、GPIO模式设置、EXTI事件配置以及中断处理程序的编写。重点展示了key1、key2和key3三个按键的中断配置过程。

key_inc.h

#ifndef __KEY_INC_H__
#define __KEY_INC_H__
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
 void key1_it_config();
 void key2_it_config();
 void key3_it_config();
 void gpio_it_config();
 
#endif

do_inc.c

#include"key_inc.h"

void key1_it_config()
{

      //1.设置GPIOF时钟使能
      RCC->MP_AHB4ENSETR |= (0X1<<5);
     // 2.将PF9管脚设置为输入
     GPIOF->MODER &= (~(0x3<<18));
      //3.设置由PF9产生EXTI9事件
      EXTI->EXTICR3 &= (0XFF<<8);
      EXTI->EXTICR3 |= (0x05<<8);
     // 4.设置EXTI9事件的检测方式为下降沿检测
     EXTI->FTSR1 |= (0x1<<9);
     // 5.允许中断不屏蔽，可以被转发到GIC
     EXTI->C1IMR1 |= (0x1<<9);
     // 6.允许EXTI9（99号）中断被保存在组0中
     GICD->ISENABLER[3]|= (0x1<<3);
     // 7.设置99号中断优先级
     GICD->IPRIORITYR[24] &= (~(0x1f<<27));
     GICD->IPRIORITYR[24] |= (0x0<<27);
     // 8.设置99号中断可以被CPU0处理
     GICD->ITARGETSR[24] &= (~(0x3<<24));
     GICD->ITARGETSR[24] |= (0x1<<24);
      //9.允许99号中断被转发到CPU接口层
      GICD->CTRL |= 0x1;
      //10.设置中断优先级掩码
      GICC->PMR |= (0x1f<<3);
      //11.允许中断被转发给CPU处理
      GICC->CTRL |=0x1;
    

}
void key2_it_config()
{
     //RCC使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
     //pf7
    GPIOF->MODER &= (~(0x3<<14));
    //设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx
    //pf7
    EXTI->EXTICR2 &=(~(0xFF<<24));
    EXTI->EXTICR2 |= (0x5<<24);
     //设置事件触发方式为下降沿触发EXTI_FTSR1
    //pf7
    EXTI->FTSR1 |= (0x1<<7);
      //设置EXTI事件触发不屏蔽EXTI_IMR1
    //PF7
    EXTI->C1IMR1 |= (0x1<<7);
     //使能中断能转发到特定的CPU接口层GICD_ISENABLERx
    //PF7 97号中断
    GICD->ISENABLER[3] |= (0X1<<1); 
    // GICD_ISENABLERx设置中断优先级
    //PF7
    GICD->IPRIORITYR[24] &= (~(0X1F<<11)); 
      //设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx
    //pf7 97中断
    GICD->ITARGETSR[24]  &= (~(0X3<<8));
    GICD->ITARGETSR[24] |= (0X1<<8);
    
}
void key3_it_config()
{
     //RCC使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    GPIOF->MODER &= (~(0x3<<16));
    EXTI->EXTICR3 &=(~(0xFF<<0));
    EXTI->EXTICR3 |= (0x5<<0);
    EXTI->FTSR1 |= (0x1<<8);
    EXTI->C1IMR1 |= (0x1<<8);
    GICD->ISENABLER[3] |= (0X1<<2); 
    GICD->IPRIORITYR[24] &= (~(0X1F<<19)); 
    GICD->ITARGETSR[24]  &= (~(0X3<<16));
    GICD->ITARGETSR[24] |= (0X1<<16);
}
  void gpio_it_config()
  {
      RCC->MC_AHB4ENSETR |= (0X1<<4);

      GPIOE->MODER &= (0X3<<20);
      GPIOE->MODER |= (0X1<<20);
      GPIOE->MODER &= (0X3<<16);
      GPIOE->MODER |= (0X1<<16);
      GPIOF->MODER &= (0X3<<20);
      GPIOF->MODER |= (0X1<<20);

      GPIOE->OTYPER &= (~(0X1<<10));
      GPIOF->OTYPER &= (~(0X1<<10));
      GPIOE->OTYPER &= (~(0X1<<8));

      GPIOE->OSPEEDR &= (~(0X3<<20));
      GPIOF->OSPEEDR &= (~(0X3<<20));
      GPIOE->OSPEEDR &= (~(0X3<<16));

      GPIOE->PUPDR &= (~(0X3<<20));
      GPIOF->PUPDR &= (~(0X3<<20));
      GPIOE->PUPDR &= (~(0X3<<16));
      
      GPIOE->ODR &= (~(0X1<<10));
      GPIOF->ODR &= (~(0X1<<10));
      GPIOE->ODR &= (~(0X1<<8));
   }

main.c

#include "gpio.h"

#include"key_inc.h"

//封装延时函数

void delay(int ms)

{

    int i,j;

    for(i=0;i<ms;i++)

    {

        for(j=0;j<2000;j++)

        {}



    }

}

int main()

{

    //按键中断的初始化

    key1_it_config();

	key2_it_config();

	key3_it_config();

	gpio_it_config();

    while(1)

    {



    }

    return 0;

}

do_irq.c

#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gpio.h"



void do_irq(void) 
{
        int irqno; 
   
    irqno = GICC->IAR & 0X3FF;
    switch (irqno)
    {
    case 99: 
   
 
            GPIOE->ODR |= (0X1<<10);
  
        
        // 清除挂起中断标志位GICD_ICPENDRx
        GICD->ICPENDR[3] |= (0x1 << 3);
        // 清除中断触发标志位EXTI_FPR1
        EXTI->FPR1 |= (0x1 << 9);
        break;
 
    case 97: 
 
   
            GPIOF->ODR |= (0X1<<10);
      
         
        // 清除挂起中断标志位GICD_ICPENDRx
        GICD->ICPENDR[3] |= (0x1 << 1);
        // 清除中断触发标志位EXTI_FPR1
        EXTI->FPR1 |= (0x1 << 7);
        break;
   
    case 98:
   
    
            GPIOE->ODR |= (0X1<<8);
      
   
       
        // 清除挂起中断标志位GICD_ICPENDRx
        GICD->ICPENDR[3] |= (0x1 << 2);
        // 清除中断触发标志位EXTI_FPR1
        EXTI->FPR1 |= (0x1 << 8);
        break;
    
    }
    // 清除处理完的中断号GICC_EOIR
    GICC->EOIR = irqno;
}