.设置按键中断，按键1按下，LED亮，再按一次，灭

按键2按下，蜂鸣器响。再按一次，不响

按键3按下，风扇转，再按一次，风扇停

头文件key_it.h

#ifndef __KEY_IT_H__
#define __KEY_IT_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
void key_it_config();
void key3_it_config();
void all_led_init();
void buzzer_init();
void fan_init();
#endif

源文件key_it.c

#include"key_it.h"void key3_it_config()
{//RCC使能GPIOF时钟RCC->MP_AHB4ENSETR |= (0x1<<5);GPIOF->MODER &= (~(0x3<<16));EXTI->EXTICR3 &=(~(0xFF<<0));EXTI->EXTICR3 |= (0x5<<0);EXTI->FTSR1 |= (0x1<<8);EXTI->C1IMR1 |= (0x1<<8);GICD->ISENABLER[3] |= (0X1<<2); GICD->IPRIORITYR[24] &= (~(0X1F<<19)); GICD->ITARGETSR[24]  &= (~(0X3<<16));GICD->ITARGETSR[24] |= (0X1<<16);
}
void key_it_config()
{//RCC使能GPIOF时钟RCC->MP_AHB4ENSETR |= (0x1<<5);//设置PF9 PF7 PF8GPIO输入//PF9GPIOF->MODER &= (~(0x3<<18));//PF8// GPIOF->MODER &= (~(0x3<<16));//pf7GPIOF->MODER &= (~(0x3<<14));//设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx//pf7EXTI->EXTICR2 &=(~(0xFF<<24));EXTI->EXTICR2 |= (0x5<<24);//pf8// EXTI->EXTICR3 &=(~(0xFF<<0));// EXTI->EXTICR3 |= (0x5<<0);//pf9EXTI->EXTICR3 &=(~(0xFF<<8));EXTI->EXTICR3 |= (0x5<<8);//设置事件触发方式为下降沿触发EXTI_FTSR1//pf7EXTI->FTSR1 |= (0x1<<7);//pf8// EXTI->FTSR1 |= (0x1<<8);//pf9EXTI->FTSR1 |= (0x1<<9);//设置EXTI事件触发不屏蔽EXTI_IMR1//PF7EXTI->C1IMR1 |= (0x1<<7);//PF8// EXTI->C1IMR1 |= (0x1<<8);//PF9EXTI->C1IMR1 |= (0x1<<9);//使能中断能转发到特定的CPU接口层GICD_ISENABLERx//PF7 97号中断GICD->ISENABLER[3] |= (0X1<<1); //PF78 98号中断// GICD->ISENABLER[3] |= (0X1<<2); //PF9 99号中断GICD->ISENABLER[3] |= (0X1<<3); // GICD_ISENABLERx设置中断优先级//PF7GICD->IPRIORITYR[24] &= (~(0X1F<<11)); //PF8// GICD->IPRIORITYR[24] &= (~(0X1F<<19)); //PF9GICD->IPRIORITYR[24] &= (~(0X1F<<27)); //设置当前中断被转发到哪一个CPU处理GICD_ITARGETSRx//pf7 97中断GICD->ITARGETSR[24]  &= (~(0X3<<8));GICD->ITARGETSR[24] |= (0X1<<8);//pf8 98中断// GICD->ITARGETSR[24]  &= (~(0X3<<16));// GICD->ITARGETSR[24] |= (0X1<<16);//pf9 99中断GICD->ITARGETSR[24]  &= (~(0X3<<24));GICD->ITARGETSR[24] |= (0X1<<24);//使能组0转发中断GICD_CTLRGICD->CTRL |= 0X1;//设置中断优先级掩码GICC_PMRGICC->PMR |= (0x1F<<3);//使能CPU可以处理组0转发的中断GICC_CTLRGICC->CTRL |= 0X1;    
}void all_led_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x3<<4);//设置PE10 PF10 PE8为输出GPIOE->MODER &= (~(0X3<<20));GPIOE->MODER |= (0X1<<20);//设置推挽输出GPIOE->OTYPER &= (~(0X1<<10));//设置三个管脚低速输出GPIOE->OSPEEDR &= (~(0X3<<20));//设置三个管脚输出时无上拉电阻和下拉电阻GPIOE->PUPDR &= (~(0X3<<20));
}
void buzzer_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x1<<1);//设置PE10 PF10 PE8为输出GPIOB->MODER &= (~(0X3<<12));GPIOB->MODER |= (0X1<<12);//设置推挽输出GPIOB->OTYPER &= (~(0X1<<6));//设置三个管脚低速输出GPIOB->OSPEEDR &= (~(0X3<<12));//设置三个管脚输出时无上拉电阻和下拉电阻GPIOB->PUPDR &= (~(0X3<<12));
}
void fan_init(){//RCC使能RCC->MP_AHB4ENSETR  |= (0x1<<4);//设置PE9为输出GPIOE->MODER &= (~(0X3<<18));GPIOE->MODER |= (0X1<<18);//设置推挽输出GPIOE->OTYPER &= (~(0X1<<9));//设置三个管脚低速输出GPIOE->OSPEEDR &= (~(0X3<<18));//设置三个管脚输出时无上拉电阻和下拉电阻    GPIOE->PUPDR &= (~(0X3<<18));
}

do_irq.c

#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void) 
{int irqno;//保存中断号irqno=GICC->IAR & 0X3FF;switch(irqno){case 99://key1//按键1中断处理printf("KEY1 INT\n");GPIOE->ODR ^=(0X1<<10);//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<3);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<9);break;case 97://key2//按键2中断处理printf("KEY2 INT\n");GPIOB->ODR ^=(0x1<<6);//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<1);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<7);break;case 98://key3//按键3中断处理printf("KEY3 INT\n");GPIOE->ODR ^=(0x1<<9);//清除挂起中断标志位GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1<<2);//清除中断触发标志位EXTI_FPR1EXTI->FPR1 |= (0x1<<8);break;}//清除处理完的中断号GICC_EOIRGICC->EOIR =irqno;
}

main.c

#include "uart.h"
#include "key_it.h"
int main()
{all_led_init();uart4_init();//串口初始化//中断初始化key_it_config();key3_it_config();buzzer_init();fan_init();while(1){//保证主程序不结束}return 0;
}

现象