ARM_day7：实现三个按键中断

程序代码：

mykey.h:

cpp 复制代码

#ifndef __MYKEY_H__
#define __MYKEY_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
extern void printf(const char *fmt, ...);
void key1_int_config();
void key2_int_config();
void key3_int_config();
#endif

main.c:

cpp 复制代码

#include "mykey.h"

void delay_ms(int ms)

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

        }
    }
}
int main()
{
    //按键中断初始化
    key1_int_config();
    key2_int_config();
    key3_int_config();
    while(1)
    {
        printf("main func\n");
        delay_ms(1000);
    }
}

mykey.c:

cpp 复制代码

#include "mykey.h"
void key1_int_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF9为输入
    GPIOF->MODER &= (~(0X3<<18));
    //设置PF9产生EXTI9事件
    EXTI->EXTICR3 &= (~(0Xff<<8));
    EXTI->EXTICR3 |= (0X05<<8);
    //设置下降沿检测EXTI9事件
    EXTI->FTSR1 |= (0x1<<9);
    //取消EXTI9事件的屏蔽
    EXTI->C1IMR1 |= (0x1<<9);
    //全局使能99号中断
    GICD->ISENABLER[3] |= (0x1<<3);
    //设置99号中断优先级
    GICD->IPRIORITYR[24] &= (~(0X1f<<27));//最高优先级
    //设置99号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<24);
    //允许组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断优先级掩码
    GICC->PMR |=(0x1f<<3);
    //允许组0中断被转发给处理器
    GICC->CTRL |= 0X1;
}
void key2_int_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF7为输入
    GPIOF->MODER &= (~(0X3<<14));
    //设置PF7产生EXTI7事件
    EXTI->EXTICR2 &= (~(0Xff<<24));
    EXTI->EXTICR2 |= (0X05<<24);
    //设置下降沿检测EXTI7事件
    EXTI->FTSR1 |= (0x1<<7);
    //取消EXTI7事件的屏蔽
    EXTI->C1IMR1 |= (0x1<<7);
    //全局使能97号中断
    GICD->ISENABLER[3] |= (0x1<<1);
    //设置97号中断优先级
    GICD->IPRIORITYR[24] &= (~(0X1f<<11));
    //设置97号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<8);
    //允许组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断优先级掩码
    GICC->PMR |=(0x1f<<3);//最低优先级
    //允许组0中断被转发给处理器
    GICC->CTRL |= 0X1;
}
void key3_int_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //设置PF8为输入
    GPIOF->MODER &= (~(0X3<<16));
    //设置PF8产生EXTI8事件
    EXTI->EXTICR3 &= (~0Xff);
    EXTI->EXTICR3 |= 0X05;
    //设置下降沿检测EXTI8事件
    EXTI->FTSR1 |= (0x1<<8);
    //取消EXTI8事件的屏蔽
    EXTI->C1IMR1 |= (0x1<<8);
    //全局使能98号中断
    GICD->ISENABLER[3] |= (0x1<<2);
    //设置98号中断优先级
    GICD->IPRIORITYR[24] &= (~(0X1f<<19));
    //设置98号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<16);
    //允许组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断优先级掩码
    GICC->PMR |=(0x1f<<3);
    //允许组0中断被转发给处理器
    GICC->CTRL |= 0X1;
}

do_irq.c:

cpp 复制代码

#include "mykey.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{
    //获取中断号
    unsigned int irqno=(GICC->IAR&0X3ff);
    switch (irqno)
    {
        case  99:
            //中断处理逻辑
            printf("KEY1_INTC\n");
            //清除GICD中断标志
            GICD->ICPENDR[3] |= (0x1<<3);
            //清除EXTI中断触发标志
            EXTI->FPR1 |= (0X1<<9);
            break;
        case  97:
            //中断处理逻辑
            printf("KEY2_INTC\n");
            //清除GICD中断标志
            GICD->ICPENDR[3] |= (0x1<<3);
            //清除EXTI中断触发标志
            EXTI->FPR1 |= (0X1<<9);
            break;
        case  98:
            //中断处理逻辑
            printf("KEY3_INTC\n");
            //清除GICD中断标志
            GICD->ICPENDR[3] |= (0x1<<3);
            //清除EXTI中断触发标志
            EXTI->FPR1 |= (0X1<<9);
            break;
    }
    //清除IAR寄存器中保存的中断号
    GICC->EOIR=irqno;
}

运行结果：