12.26 stm32mp157按键中断

key.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"

void key1_it_config();
void key2_it_config();
void key3_it_config();
#endif

key.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exit9事件的输入
    EXTI->EXTICR3 &= (~(0xFF<<8));
    EXTI->EXTICR3 |= (0x05<<8);
    //设置下降沿使能检测EXTI9事件
    EXTI->FTSR1 |=(0x1<<9);
    //设置EXTI9时间不屏蔽
    EXTI->C1EMR1 |=(0x1<<9);
    //GICD使能EXIT9(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PF9管脚为输入
    GPIOF->MODER &= (~(0x3<<14));
    //设置PF9作为exit9事件的输入
    EXTI->EXTICR2 &= (~(0xFF<<24));
    EXTI->EXTICR2 |= (0x05<<24);
    //设置下降沿使能检测EXTI9事件
    EXTI->FTSR1 |=(0x1<<7);
    //设置EXTI9时间不屏蔽
    EXTI->C1EMR1 |=(0x1<<7);
    //GICD使能EXIT9(99号中断)
    GICD->ISENABLER[3] |= (0x1<<1);
    //GICD设置99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PF9管脚为输入
    GPIOF->MODER &= (~(0x3<<16));
    //设置PF9作为exit9事件的输入
    EXTI->EXTICR2 &= (~(0xFF));
    EXTI->EXTICR2 |= (0x05);
    //设置下降沿使能检测EXTI9事件
    EXTI->FTSR1 |=(0x1<<8);
    //设置EXTI9时间不屏蔽
    EXTI->C1EMR1 |=(0x1<<8);
    //GICD使能EXIT9(99号中断)
    GICD->ISENABLER[3] |= (0x1<<2);
    //GICD设置99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"
#include"led.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
    int irqno = (GICC->IAR & 0x3ff);
    switch (irqno)
    {
    case 99: //key1
        led1_on();
        printf("KEY1_INT\n");
        //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
        led2_on();
        printf("KEY2_INT\n");
        //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
        led3_on();
        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;

    default:
        break;
    }
    //清除中断号
    GICC->EOIR = irqno;
}

main.c

#include"led.h"

#include"key_it.h"



//自定义延时函数

void delay(int ms)

{



    int i,j;

    for(i=0;i