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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 "uart1.h"
#include "key_it.h"
int main()
{uart4_init();//串口初始化//中断初始化key_it_config();key3_it_config();gpio_start();while(1){//保证主程序不结束}return 0;
}

do_irp.c

#include "key_it.h"
#include "uart1.h"extern void printf(const char *fmt, ...);
unsigned int i = 0;
unsigned int num1=0,num2=0,num3=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");//灯亮if(num1 == 0){//PF10GPIOF->ODR |= (0x1<<10);//PE10 PE8GPIOE->ODR |= (0x5<<8);num1++;}//灯灭else if(num1 > 0){//PF10GPIOF->ODR &= ~(0x1<<10);//PE10 PE8GPIOE->ODR &= ~(0x5<<8);num1 = 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_FRR1EXTI->FPR1 |= (0x1<<9);break;case 97://key2//按键2中断处理printf("KEY2 INT\n");//蜂鸣器转if(num2 == 0){//PB6GPIOB->ODR |= (0x1<<6);num2++;}//蜂鸣器停else if(num2 > 0){//PB6GPIOB->ODR &= ~(0x1<<6);num2 = 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_FRR1EXTI->FPR1 |= (0x1<<7);break;case 98://key3//按键3中断处理printf("KEY3 INT\n");//风扇转if(num3 == 0){//PE9GPIOE->ODR |= (0x1<<9);num3++;}//风扇停else if(num3 > 0){//PE9GPIOE->ODR &= ~(0x1<<9);num3 = 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_FRR1EXTI->FPR1 |= (0x1<<8);break;}//清除处理完的中断号GICC_EOIRGICC->EOIR=irqno;
}

key_it.c

#include "key_it.h"
#include "uart1.h"extern void printf(const char *fmt, ...);
unsigned int i = 0;
unsigned int num1=0,num2=0,num3=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");//灯亮if(num1 == 0){//PF10GPIOF->ODR |= (0x1<<10);//PE10 PE8GPIOE->ODR |= (0x5<<8);num1++;}//灯灭else if(num1 > 0){//PF10GPIOF->ODR &= ~(0x1<<10);//PE10 PE8GPIOE->ODR &= ~(0x5<<8);num1 = 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_FRR1EXTI->FPR1 |= (0x1<<9);break;case 97://key2//按键2中断处理printf("KEY2 INT\n");//蜂鸣器转if(num2 == 0){//PB6GPIOB->ODR |= (0x1<<6);num2++;}//蜂鸣器停else if(num2 > 0){//PB6GPIOB->ODR &= ~(0x1<<6);num2 = 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_FRR1EXTI->FPR1 |= (0x1<<7);break;case 98://key3//按键3中断处理printf("KEY3 INT\n");//风扇转if(num3 == 0){//PE9GPIOE->ODR |= (0x1<<9);num3++;}//风扇停else if(num3 > 0){//PE9GPIOE->ODR &= ~(0x1<<9);num3 = 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_FRR1EXTI->FPR1 |= (0x1<<8);break;}//清除处理完的中断号GICC_EOIRGICC->EOIR=irqno;
}