ARM day7

题目1：按键中断代码编写

代码：

main.c

#include "key_it.h"

#include "led.h"

void delay(int ms)

{

  int i,j;

  for(i=0;i

key_it.c

#include "key_it.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()
{

       //1.设置GPIOF时钟使能
         RCC->MP_AHB4ENSETR|=(0x1<<5);
      //2.将PF8管脚设置为输入
                    GPIOF->MODER &=(~(0x3<<16));
      // 3.设置由PF8产生EXTI9事件
              EXTI->EXTICR3 &= (~(0xff));
              EXTI->EXTICR3 |=(0X05);
       //4.设置EXTI8事件的检测方式为下降沿检测
              EXTI->FTSR1 |= (0X1<<8);
       //5.允许中断不屏蔽，可以被转发到GIC
      EXTI->C1IMR1 |=  (0X1<<8);
       //6.允许EXTI8（98号）中断被保存在组0中
        GICD->ISENABLER[3] |= (0X1<<2);
       //7.设置98号中断优先级
        GICD->IPRIORITYR[24] &= (~(0X1F<<19));
        GICD->IPRIORITYR[24] |= (0X0<<19);
       //8.设置98号中断可以被CPU0处理
              GICD->ITARGETSR[24] &= (~(0x3<<16));
     GICD->ITARGETSR[24] |= (0x1<<16);
       //9.允许98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 key3_it_config()
{
       //1.设置GPIOF时钟使能
         RCC->MP_AHB4ENSETR|=(0x1<<5);

       //2.将PF7管脚设置为输入
          GPIOF->MODER &=(~(0x3<<14));
      // 3.设置由PF7产生EXTI7事件
      EXTI->EXTICR2 &= (~(0XFF<<24));
      EXTI->EXTICR2 |= (0X05<<24);
       //4.设置EXTI7事件的检测方式为下降沿检测
       EXTI->FTSR1 |= (0X1<<7);
       //5.允许中断不屏蔽，可以被转发到GIC
      EXTI->C1IMR1 |= (0X1<<7);
       //6.允许EXTI7（97号）中断被保存在组0中
        GICD->ISENABLER[3] |= (0X1<<1);
       //7.设置97号中断优先级
        GICD->IPRIORITYR[24] &= (~(0X1F<<11));
        GICD->IPRIORITYR[24] |= (0X0<<11);
       //8.设置97号中断可以被CPU0处理
              GICD->ITARGETSR[24] &= (~(0x3<<8));
     GICD->ITARGETSR[24] |= (0x1<<8);
       //9.允许97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;
    
}

key_it.h

#ifndef __KEY_IT_H__
#define  __KEY_IT_H__
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h" 
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
extern void printf(const char *fmt, ...);

void key1_it_config();
void key2_it_config();
void key3_it_config();

#endif

do_irq.c

#include"key_it.h"
#include "led.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
int flag1=0,flag2=0,flag3=0;
void do_irq(void) 
{
     //获取中断号，根据中断号的不同进行不同的中断处理
    int irqno;
    irqno=GICC->IAR&0x3ff;
    switch(irqno)
    {
        case 99:
            printf("key1 int\n");
            if(flag1%2==0){
              myled1_on();
              flag1++;
              }
              else
              {
                  flag1++;
                  myled1_off();
              }
              
            //清除exti中断标志位
         EXTI->FPR1|=(0X1<<9);      
            //清除GICD中断标志位
          GICD->ICPENDR[3] = (0x1 << 3);
            break;
              case 98:
            printf("key2 int\n");
                   if(flag2%2==0){
              myled2_on();
              flag2++;
              }
              else
              {
                  flag2++;
                  myled2_off();
              }
            //清除exti中断标志位
            EXTI->FPR1|=(0X1<<8);      
            //清除GICD中断标志位
          GICD->ICPENDR[3] = (0x1 << 2);
            break;

              case 97:
            printf("key3 int\n");
                        if(flag3%2==0){
              myled3_on();
              flag3++;
              }
              else
              {
                  flag3++;
                  myled3_off();
              }
            //清除exti中断标志位
        EXTI->FPR1|=(0X1<<7);      
            //清除GICD中断标志位
          GICD->ICPENDR[3] = (0x1 << 1);
            break;            
    }
    //清除IAR寄存器的值
        GICC->EOIR = irqno;
}

现象：