ARAM 中断实验

思路：按键->EXTI->GIC->CPU->异常向量表

//使能GPIOF时钟

//设置PF9管脚为输入(KEY1)

//设置PF9作为EXTI9事件的输入(事件编号对应管脚号)

//设置下降沿使能检测EXTI9事件 (也可设置上升沿没有下降沿严谨方便,不同场景不同选择)

//设置EXTI9事件不屏蔽? ?(只有不屏蔽中断事件才能继续执行)

//GICD使能EXTI9（99号）中断? (给中断信号使能)

//GICD 设置99号中断的优先级? ?(中断信号的优先级要设置的高)

//选择CPU0处理当前中断

//全局使能组0中断被转发到GICC? (在组0? 组1 选择 组0)

//设置中断的优先级掩码? （让掩码的优先级降到最低，使自己的中断优先级高于他）

//允许组0中断被CPU处理

irq就是IRQ中断

key_it.h

#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_gic.h"
#include"stm32mp1xx_exti.h"
#include"stm32mp1xx_rcc.h"
#include "led.h"
void key1_it_config();
void key2_it_config();
void key3_it_config();
void delay(int ms);
#endif

key_it.c

#include"key_it.h"
void key1_it_config()
{
    //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF9管脚为输入
    GPIOF->MODER &= (~(0x3<<18));
    //设置PF9作为EXTI9事件的输入
    EXTI->EXTICR3 &= (~(0x1f<<8));
    EXTI->EXTICR3 |= (0x05<<8);
    //设置下降沿使能检测EXTI9事件
    EXTI->FTSR1 |= (0x1<<9);
    //设置EXTI9事件不屏蔽
    EXTI->C1IMR1 |= (0x1<<9);
    //GICD使能EXTI9（99号）中断
    GICD->ISENABLER[3] |= (0x1<<3);
    //GICD 设置99号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<27));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<24);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0X1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1);
}
void key2_it_config()
{
    //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF7管脚为输入
    GPIOF->MODER &= (~(0x3<<14));
    //设置PF7作为EXTI7事件的输入
    EXTI->EXTICR2 &= (~(0x1f<<24));
    EXTI->EXTICR2 |= (0x05<<24);
    //设置下降沿使能检测EXTI7事件
    EXTI->FTSR1 |= (0x1<<7);
    //设置EXTI7事件不屏蔽
    EXTI->C1IMR1 |= (0x1<<7);
    //GICD使能EXTI7（97号）中断
    GICD->ISENABLER[3] |= (0x1<<1);
    //GICD 设置97号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<11));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<8);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0X1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1);
}
void key3_it_config()
{
    //使能GPIOF时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF8管脚为输入
    GPIOF->MODER &= (~(0x3<<16));
    //设置PF8作为EXTI8事件的输入
    EXTI->EXTICR3 &= (~(0x1f));
    EXTI->EXTICR3 |= (0x05);
    //设置下降沿使能检测EXTI8事件
    EXTI->FTSR1 |= (0x1<<8);
    //设置EXTI8事件不屏蔽
    EXTI->C1IMR1 |= (0x1<<8);
    //GICD使能EXTI8（98号）中断
    GICD->ISENABLER[3] |= (0x1<<2);
    //GICD 设置98号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<19));
    //选择CPU0处理当前中断
    GICD->ITARGETSR[24] |= (0x1<<16);
    //全局使能组0中断被转发到GICC
    GICD->CTRL |= (0X1);
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //允许组0中断被CPU处理
    GICC->CTRL |= (0x1); 
}

do_irq.c

#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
 
//延时函数
void delay(int ms)
{
  int i,j;
  for(i=0;i<ms;i++)
  {
    for(j=0;j<2000;j++);
  }
}
 
void do_irq(void)
{
    //LED灯初始化
    all_led_init();
 
    int irqno = (GICC->IAR & 0x3ff);
    switch (irqno)
    {
    case 99: // key1
        printf("KEY1_INT\n");
 
        //点亮两个灯
        led1_on();
        led3_on();
        delay(1000);
 
        //熄灭两个灯
        led1_off();
        led3_off();
        delay(1000);
 
        // 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
        printf("KEY2_INT\n");
 
        //点亮一个灯
        led1_on();
        delay(1000);
 
        //熄灭三个灯
        led1_off();
        led2_off();
        led3_off();
        delay(1000);
 
        // 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: // key3
        printf("KEY3_INT\n");
 
        //延时点亮三个灯，一个灯亮的同时下个灯灭
        led1_on();
        delay(1000);
 
        led1_off();
        led2_on();
        delay(1000);
 
        led2_off();
        led3_on();
        delay(1000);
 
        led3_off();
 
        // 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;
    }
    // 清除中断号
    GICC->EOIR = irqno;
}

main.c

#include "key_it.h"

void delay(int ms)
{
  int i,j;
  for(i=0;i<ms;i++)
  {
    for(j=0;j<2000;j++);
  }
}

int main()
{
  key1_it_config();
  key2_it_config();
  key3_it_config();
    while (1)
    {
        printf("do main...\n");
        delay(1000);
    }
}