STM32 多功能按键中断

key1 开关实现led1亮灭,key2开关实现蜂鸣器开关,key3开关实现风扇开关

main.c

#include "uart.h"
#include "key_it.h"
#include "led.h"
int main()
{char c;char *s;uart4_init();//串口初始化all_led_init();key_it_config();fengshan_init();key3_it_config();while(1){}return 0;
}

 按键功能函数 

#include"key_it.h"
void key3_it_config()
{	RCC->MP_AHB4ENSETR |= (0x1<<5);//PF8GPIOF->MODER &= (~(0x3<<16));//PF8EXTI->EXTICR3 &= (~(0xFF<<0));EXTI->EXTICR3 |= (0x5<<0);//设置触发方式为下降沿触发EXTI_FTSR1EXTI->FTSR1 |= (0x1<<8);//设置EXTI事件触发不屏蔽 EXTI_IMR1EXTI->C1IMR1 |=(0x1<<8);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);RCC->MP_AHB4ENSETR |= (0x1<<1);RCC->MP_AHB4ENSETR |= (0x1<<4);//设置PF9 PF7 PF8 GPIO_MODER输入//PF9GPIOF->MODER &= (~(0x3<<18)); //PF7GPIOF->MODER &= (~(0x3<<14));GICD->ISENABLER[3] |= (0x1<<2);   //PF8 98号中断 //PB6 蜂鸣器GPIOB->MODER &= (~(0x3<<12));GPIOB->MODER |=(0x1<<12);GPIOB->OTYPER &=(~(0x1<<6));GPIOB->OSPEEDR &= (~(0x3<<12));GPIOB->PUPDR &= (~(0x3<<12));//设置PF9 PF7 PF8产生EXTI事件 EXTI_EXTICRx//PF7EXTI->EXTICR2 &= (~(0xFF<<24));EXTI->EXTICR2 |= (0x5<<24);//pF9EXTI->EXTICR3 &= (~(0xFF)<<8);EXTI->EXTICR3 |= (0x5<<8);	//设置触发方式为下降沿触发EXTI_FTSR1EXTI->FTSR1 |= (0x7<<7);//设置EXTI事件触发不屏蔽 EXTI_IMR1EXTI->C1IMR1 |=(0x7<<7);//使能组0转发中断GICD_CTRLGICD->CTRL |=(0x1);//使能中断能转发到特定的CPU接口层GICD->ISENABLER[3] |= (0x1<<3);   //PF9 99号中断 GICD->ISENABLER[3] |= (0x1<<1);   //PF7 97号中断//GICD_IPRIOITYR设置中断优先级GICD->IPRIORITYR[24] &= (~(0x1F)<<11);//PF9GICD->IPRIORITYR[24] &= (~(0x1F<<27));//设置当前中断被转发特定的CPU接口层GICO_ITARGETSRxGICD->ITARGETSR[24] &= (~(0x3<<8));GICD->ITARGETSR[24] |= (0x1<<8);GICD->ITARGETSR[24] &= (~(0x3<<24));GICD->ITARGETSR[24] |= (0x1<<24);//使能CPU可以处理组0转发的中断GICD_CTLRGICC->CTRL |= 0x1;//设置中断优先级掩码GICC_CTKRGICC->PMR |= (0x1F<<3);GICC->CTRL |= (0x1);}
void fengshan_init()
{RCC->MP_AHB4ENSETR |= (0x1<<4);//PB9GPIOE->MODER &= (~(0x3<<18));GPIOE->MODER |= (0x1<<18);GPIOE->OTYPER &=(~(0x1<<9));GPIOE->OSPEEDR &= (~(0x3<<18));GPIOE->PUPDR &= (~(0x3<<18));
}

 头文件 key_it.h

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

 led的功能函数 led.c

#include"led.h"
//延时函数
void delay(int ms)
{int i,j;for(i=0;i<ms;i++){for(j=0;j<2000;j++);}
}//GPIO初始化
void all_led_init()
{//RCC使能RCC->MP_AHB4ENSETR |= (0x3<<20);//设置PE10 PF10 PE8为输出GPIOE->MODER &= (~(0x3<<20));GPIOE->MODER |= (0x1<<20);GPIOF->MODER &= (~(0x3<<20));GPIOF->MODER |= (0x1<<20);GPIOE->MODER &= (~(0x3<<16));GPIOE->MODER |= (0x1<<16);//设置推挽输出GPIOE->OTYPER &= (~(0x1<<10));GPIOF->OTYPER &= (~(0x1<<10));GPIOE->OTYPER &= (~(0x1<<8));//设置三个管脚低速输出GPIOE->OSPEEDR &= (~(0x3<<20));GPIOF->OSPEEDR &= (~(0x3<<20));GPIOE->OSPEEDR &= (~(0x3<<16));//设置三个管脚输出时无上拉电阻和下拉电阻GPIOE->PUPDR &= (~(0x3<<20));GPIOE->PUPDR &= (~(0x3<<20));GPIOE->PUPDR &= (~(0x3<<20));}

中断处理函数实现do_irq.c

#include "key_it.h"
#include "led.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
int flag=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\n");printf("key1 ID =%d\n",irqno);//LED亮if(flag==0){GPIOE->ODR |=(0x1<<10);flag=1;//GPIOE.odr &=(~(0x1<<10));//GPIOE.odr &= (~(0x1<<8));}else{flag=0;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://按键2中断处理printf("key2\n");printf("key2 ID =%d\n",irqno);if(flag==0){GPIOB->ODR |=(0x1<<6);flag=1;}else{flag=0;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://按键3中断处理printf("key3\n");printf("key3 ID =%d\n",irqno);if(flag==0){GPIOE->ODR |=(0x1<<9);flag=1;}else{flag=0;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);}//清除处理完的中断号GICC->EOIR=irqno;
}