ARM day4

实现三个按键中断代码

按键1中断控制LED1

按键2中断控制LED2

按键3中断控制LED3

key_it.c

#include"key_it.h"

//按键1中断的配置
void key1_config()
{
    //使能GPIOF外设时钟
    RCC->MP_AHB4ENSETR |= (0x1<<5);
    //将PF9设置为输入
    GPIOF->MODER &= (~(0x3<<18));
    //设置PF9生成EXTI9事件
    EXTI->EXTICR3 &= (~(0xff<<8));
    EXTI->EXTICR3 |= (0x05<<8);
    //设置下降沿检测EXTI9事件
    EXTI->FTSR1 |= (0x1<<9);
    //取消EXTI9的事件屏蔽
    EXTI->C1IMR1 |= (0X1<<9);
    //使能99号中断
    GICD->ISENABLER[3] |= (0X1<<3);
    //设置99号中断的优先级
    GICD->IPRIORITYR[24] &= (~(0x1f<<27));
    //设置99号中断的目标处理器
    GICD->ITARGETSR[24] |= (0x1<<24);
    //全局使能组0中断被转发到GICC层
    GICD->CTRL |= 0X1;
    //设置中断的优先级掩码
    GICC->PMR |= (0x1f<<3);
    //全局使能组0中断被转发给处理器
    GICC->CTRL |= (0x1);
}
//按键2中断的配置
void key2_config()
{
     //使能GPIOF外设