12.26作业

do_irq.c

#include"key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
    int a=(GICC->IAR  & 0x3ff);
    switch (a)
    {
    case 99://key1
                     led1_on();
                    //清除GICD的中断排队标志
                    GICD->ICPENDR[3] |=(0x1<<3);
                    //清除EXTI的事件触发标志
                    EXTI->FPR1 |=(0x1<<9);
                    break;
    case 97://key2
                     led1_off();
                     //清除GICD的中断排队标志
                    GICD->ICPENDR[3] |=(0x1<<1);
                    //清除EXTI的事件触发标志
                    EXTI->FPR1 |=(0x1<<7);
                    break;
    case 98:
                    printf("key3_int\n");
                    //清除GICD的中断排队标志
                    GICD->ICPENDR[3] |=(0x1<<2);
                    //清除EXTI的事件触发标志
                    EXTI->FPR1 |=(0x1<<8);
                    break;
    }
    GICC->EOIR =a;
}

key_it.h

#ifndef    __KEY_IT_H__
#define   __KEY_IT_H__

#include"stm32mp1xx_exti.h"
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_gic.h"
void key1_init();
void key2_init();
void key3_init();
void led1_init();
void led1_on();
void led1_off();

#endif

#include"key_it.h"

void key1_init()
{
  //使能时钟
  RCC->MP_AHB4ENSETR |=(0x1<<5); 
  //设置输入模式 PF9
  GPIOF->MODER &=(~(0x3<<18));

  //设置PF9作为EXTI9的事件输入
  EXTI->EXTICR3  &=(~(0xff<<8));
  EXTI->EXTICR3  |=(0x05<<8);
  //设置下降沿
  EXTI->FTSR1  |=(0x1<<9);
 //设置EXTi9事件不屏蔽
  EXTI->C1IMR1  |=(0x1<<9);

//使能GICD中断
GICD->ISENABLER[3]  |=(0x1<<3);
//设置GICD中断优先级
GICD->IPRIORITYR[24]  &=(~(0x1f<<27));
//设置cpu0处理当前中断
GICD->ITARGETSR[24]  |=(0x1<<24);
//全局使能使组0中断可以被转发到GICC
GICD->CTRL  |=(0x1);

//设置优先级掩码
GICC->PMR  |=(0x1f<<3);
//设置允许组0中断被cpu处理
GICC->CTRL |=(0x1);

}
void key2_init()
{
//设置PF7输入模式
GPIOF->MODER &=(~(0x3<<14));

//设置PF7作为EXTI7事件输入
EXTI->EXTICR2 &=(~(0xff<<24));
EXTI->EXTICR2 |=(0x5<<24);
//设置下降沿检测
EXTI->FTSR1 |=(0x1<<7);
//设置EXTI7事件不屏蔽
EXTI->C1IMR1 |=(0x1<<7);

//使能GICD中断
GICD->ISENABLER[3]  |=(0x1<<1);
//设置GICD中断优先级
GICD->IPRIORITYR[24]  &=(~(0x1f<<11));
//设置cpu0处理当前中断
GICD->ITARGETSR[24]  |=(0x1<<8);
//全局使能使组0中断可以被转发到GICC
GICD->CTRL  |=(0x1);

//设置优先级掩码
GICC->PMR  |=(0x1f<<3);
//设置允许组0中断被cpu处理
GICC->CTRL |=(0x1);
}
void key3_init()
{
//设置PF8输入模式
GPIOF->MODER &=(~(0x3<<16));

//设置PF8作为EXTI8事件输入
EXTI->EXTICR3 &=(~(0xff));
EXTI->EXTICR3 |=(0x5);
//设置下降沿检测
EXTI->FTSR1 |=(0x1<<8);
//设置EXTI7事件不屏蔽
EXTI->C1IMR1 |=(0x1<<8);

//使能GICD中断
GICD->ISENABLER[3]  |=(0x1<<2);
//设置GICD中断优先级
GICD->IPRIORITYR[24]  &=(~(0x1f<<19));
//设置cpu0处理当前中断
GICD->ITARGETSR[24]  |=(0x1<<16);
//全局使能使组0中断可以被转发到GICC
GICD->CTRL  |=(0x1);

//设置优先级掩码
GICC->PMR  |=(0x1f<<3);
//设置允许组0中断被cpu处理
GICC->CTRL |=(0x1);
}

void led1_init()
{
  //设置pe的时钟使能
  RCC->MC_AHB4ENSETR |=(0x1<<4);
    GPIOE->MODER &=(~(0X3<<20));//设置PE10输出
    GPIOE->MODER |= (0X1<<20);
    //设置PE10为推挽输出
    GPIOE->OTYPER &=(~(0x1<<10));
    //PE10为低速输出
    GPIOE->OSPEEDR &= (~(0x3<<20));
    //设置无上拉下拉
    GPIOE->PUPDR &= (~(0x3<<20));
}
void led1_on()
{
    GPIOE->ODR |= (0x1<<10);
}

void led1_off()
{
    GPIOE->ODR &= (~(0x1<<10));
}

main.c

#include "key_it.h"

void delay(int ms)

{

   int i,j;

   for(i=0;i