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三个按键中断，控制对应灯亮灭

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

do_irq.c

#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{int irqno = (GICC->IAR & 0x3ff);switch(irqno){case 99:printf("KEY1_INT\n");led1_on();led2_off();led3_off();//求出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:printf("KEY2_INT\n");led1_off();led2_on();led3_off();GICD->ICPENDR[1] |= (0x1);EXTI->FPR1 |= (0x1<<7);break;case 98:printf("KEY3_INT\n");led1_off();led2_off();led3_on();GICD->ICPENDR[2] |= (0x1<<2);EXTI->FPR1 |= (0x1<<8);break;}GICC->EOIR = irqno;
}

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GICCGICD->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EXTI9事件EXTI->FTSR1 |=(0x1<<7);//设置EXTI7事件不屏蔽EXTI->C1IMR1 |=(0x1<<7);//GICO使能EXTI7(97号)中断GICD->ISENABLER[3] |=(0x1<<1);//GICO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GICCGICD->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EXTI9事件不屏蔽EXTI->C1IMR1 |=(0x1<<8);//GICO使能EXTI8(98号)中断GICD->ISENABLER[3] |=(0x1<<2);//GICO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GICCGICD->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);
}

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"stm32mp1xx_uart.h"void key1_it_config();
void key2_it_config();
void key3_it_config();void all_led_init();
void led1_on();
void led1_off();
void led2_on();
void led2_off();
void led3_on();
void led3_off();
#endif