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
main.c
#include "gpio.h"
#include "key_it.h"int main()
{//中断初始化key3_it_config();key_it_config();led_init();beep_init();fan_init();while(1){//保证主程序不结束} return 0;
}
do_irq.c
#include "key_it.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;void delay(int ms){for(int i=0; i<ms; i++){for(int j=0; j<2000; j++){}}
}
unsigned int flag_led = 0;
unsigned int flag_beep = 0;
unsigned int flag_fan = 0;void do_irq(void)
{//保存中断号int irqno;printf("%d\n", irqno);irqno = GICC->IAR & 0x3FF;switch(irqno){case 99://按键1中断处理if(flag_led==0){GPIOE->ODR |= (0x1<<10);GPIOF->ODR |= (0x1<<10);GPIOE->ODR |= (0x1<<8);flag_led = 1;}else{GPIOE->ODR &= (~(0x1<<10));GPIOF->ODR &= (~(0x1<<10));GPIOE->ODR &= (~(0x1<<8));flag_led = 0;}//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if(flag_beep==0){GPIOB->ODR |= (0x1<<6);flag_beep = 1;}else{GPIOB->ODR &= (~(0x1<<6));flag_beep = 0;}//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if(flag_fan==0){GPIOE->ODR |= (0x1<<9);flag_fan = 1;}else{GPIOE->ODR &= (~(0x1<<9));flag_fan = 0;}//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;
}
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 led_init(){//将gpioe和GPIOF的时钟使能RCC->MP_AHB4ENSETR |= (0x3<<4);//将三盏灯对应的gpio口的模式设置为输出GPIOE->MODER &= (~(0x3<<20));GPIOE->MODER |= (0x1<<20);GPIOF->MODER &= (~(0x3<<20));GPIOF->MODER |= (0x1<<20);GPIOE->MODER &= (~(0x3<<16));GPIOE->MODER |= (0x1<<16);//将输出模式设置为推挽输出GPIOE->MODER |= (0x1<<10);GPIOF->MODER |= (0x1<<10);GPIOE->MODER |= (0x1<<8);//将输出设置为低速GPIOE->OSPEEDR &= (~(0x3<<20));GPIOF->OSPEEDR &= (~(0x3<<20));GPIOE->OSPEEDR &= (~(0x3<<16));//设置无上拉下拉电阻GPIOE->PUPDR &= (~(0x3<<20));GPIOF->PUPDR &= (~(0x3<<20));GPIOE->PUPDR &= (~(0x3<<16));
}void beep_init(){//将gpiob的时钟使能RCC->MP_AHB4ENSETR |= (0x1<<1);//讲蜂鸣器对应的PB6口的模式设置为输出模式GPIOB->MODER &= (~(0x3<<12));GPIOB->MODER |= (0x1<<12);//将输出模式设置为推挽输出GPIOB->MODER |= (0x1<<6);//讲输出设置为低速GPIOB->OSPEEDR &= (~(0x3<<12));//设置无上拉下拉电阻GPIOB->PUPDR &= (~(0x3<<12));
}void fan_init(){//将gpiob的时钟使能RCC->MP_AHB4ENSETR |= (0x1<<4);//讲风扇对应的PE9口的模式设置为输出模式GPIOE->MODER &= (~(0x3<<18));GPIOE->MODER |= (0x1<<18);//将输出模式设置为推挽输出GPIOE->MODER |= (0x1<<9);//讲输出设置为低速GPIOE->OSPEEDR &= (~(0x3<<18));//设置无上拉下拉电阻GPIOE->PUPDR &= (~(0x3<<18));
}
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 led_init();
void beep_init();
void fan_init();
#endif
效果图
