实现三个按键的中断

main.c ：主函数初始化

#include "key_inc.h"
#include "uart4.h"
//封装延时函数
void delay(int ms)
{int i, j;for (i = 0; i < ms; i++){for (j = 0; j < 2000; j++);}
}
int main()
{char *s = "hello world";//串口初始化uart4_init();//按键中断的初始化all_key_init();key1_it_config();key2_it_config();key3_it_config();while (1){puts(s);delay(1000);}return 0;
}

do_irq.c ：处理中断信号

#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "uart4.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;void do_irq(void)
{//获取要处理的中断的中断号unsigned int irqno = GICC->IAR & 0x3ff;switch (irqno){case 99:puts("key1_intc");//清除GICD中断排队标志GICD->ICPENDR[3] |= (0X1 << 3);//清除EXTI中断触发标志EXTI->FPR1 |= (0X1 << 9);break;case 98:puts("key3_intc");//清除GICD中断排队标志GICD->ICPENDR[3] |= (0X1 << 2);//清除EXTI中断触发标志EXTI->FPR1 |= (0X1 << 8);break;case 97:puts("key2_intc");//清除GICD中断排队标志GICD->ICPENDR[3] |= (0X1 << 1);//清除EXTI中断触发标志EXTI->FPR1 |= (0X1 << 7);break;default:break;}//清除IAR寄存器中的中断号GICC->EOIR |= irqno;
}

key_inc.c :配置key

#include "key_inc.h"void all_key_init()
{//使能GPIOF外设时钟RCC->MP_AHB4ENSETR |= (0x1 << 5);
}void key1_it_config()
{//将PF9设置为输入模式GPIOF->MODER &= (~(0x3 << 18));//设置由PF9管脚产生EXTI9事件EXTI->EXTICR3 &= (~(0XFF << 8));EXTI->EXTICR3 |= (0X05 << 8);//通过下降沿检测EXTI9事件是否产生EXTI->FTSR1 |= (0x1 << 9);//取消EXTI9中断屏蔽EXTI->C1IMR1 |= (0x1 << 9);//设置EXTI9中断全局使能GICD->ISENABLER[3] |= (0x1 << 3);//设置中断优先级GICD->IPRIORITYR[24] &= (~(0x1f << 27));//设置CPU0处理当前中断GICD->ITARGETSR[24] |= (0x1 << 24);//设置组0中断可以被转发到GICC层GICD->CTRL |= 0X1;//设置中断优先级掩码GICC->PMR |= (0x1f << 3);//设置组0中断交给指定处理器处理GICC->CTRL |= 0x1;
}
void key2_it_config()
{//将PF7设置为输入模式GPIOF->MODER &= (~(0x3 << 14));//设置由PF7管脚产生EXTI7事件EXTI->EXTICR2 &= (~(0XFF << 24));EXTI->EXTICR2 |= (0X05 << 24);//通过下降沿检测EXTI7事件是否产生EXTI->FTSR1 |= (0x1 << 7);//取消EXTI7中断屏蔽EXTI->C1IMR1 |= (0x1 << 7);//设置EXTI7中断全局使能GICD->ISENABLER[3] |= (0x1 << 1);//设置中断优先级GICD->IPRIORITYR[24] &= (~(0x1f << 11));//设置CPU0处理当前中断GICD->ITARGETSR[24] |= (0x1 << 8);//设置组0中断可以被转发到GICC层GICD->CTRL |= 0X1;//设置中断优先级掩码GICC->PMR |= (0x1f << 3);//设置组0中断交给指定处理器处理GICC->CTRL |= 0x1;
}void key3_it_config()
{//将PF8设置为输入模式GPIOF->MODER &= (~(0x3 << 16));//设置由PF8管脚产生EXTI8事件EXTI->EXTICR3 &= (~(0XFF << 0));EXTI->EXTICR3 |= (0X05 << 0);//通过下降沿检测EXTI8事件是否产生EXTI->FTSR1 |= (0x1 << 8);//取消EXTI7中断屏蔽EXTI->C1IMR1 |= (0x1 << 8);//设置EXTI7中断全局使能GICD->ISENABLER[3] |= (0x1 << 2);//设置中断优先级GICD->IPRIORITYR[24] &= (~(0x1f << 19));//设置CPU0处理当前中断GICD->ITARGETSR[24] |= (0x1 << 16);//设置组0中断可以被转发到GICC层GICD->CTRL |= 0X1;//设置中断优先级掩码GICC->PMR |= (0x1f << 3);//设置组0中断交给指定处理器处理GICC->CTRL |= 0x1;
}

key_inc.h

#ifndef __KEY_INC_H__
#define __KEY_INC_H__#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"void all_key_init();
void key1_it_config();
void key2_it_config();
void key3_it_config();#endif