作业：按键中断实现LED1、蜂鸣器、风扇 key_in.c: #include "key_in.h"void gpio_init(){//RCC使能//GPIOERCC->MP_AHB4ENSETR |= (0x1<<4);//GPIOBRCC->MP_AHB4ENSETR |= (0x1<<1);//PE10、PB6、PE9输出模式GPIOE->MODER &= ~(0x3<<20);GP