练习：

封装exti，cic初始化函数
 

//EXTI初始化
void hal_key_exti_init(int id,int exticr,int mode){
    //获取偏移地址
    int address_offset = (id%4)*8;
    //获取寄存器编号
    int re_ser = (id/4)+1;
    //
    printf("address_offset=%d,re_ser=%d\n",address_offset,re_ser);
    //1.设置外部中断选择寄存器进行连接
    if(re_ser==1){
        EXTI->EXTICR1 &= ~(0xff<<address_offset);
        EXTI->EXTICR1 |= (exticr<<address_offset);
    }else if(re_ser==2){
        EXTI->EXTICR2 &= ~(0xff<<address_offset);
        EXTI->EXTICR2 |= (exticr<<address_offset);
    }else if(re_ser==3){
        EXTI->EXTICR3 &= ~(0xff<<address_offset);
        EXTI->EXTICR3 |= (exticr<<address_offset);
    }else if(re_ser==4){
        EXTI->EXTICR4 &= ~(0xff<<address_offset);
        EXTI->EXTICR4 |= (exticr<<address_offset);
    }
    //2.设置触发方式
    if(mode==1){
        EXTI->FTSR1 &= ~(0x1<<id);
        EXTI->RTSR1 |= (0x1<<id);
    }else if(mode==0){
        EXTI->RTSR1 &= ~(0x1<<id);
        EXTI->FTSR1 |= (0x1<<id);
    }
    //3.设置EXTI层中断不屏蔽
    EXTI->C1IMR1 |= (0x1<<id);
}

//GIC初始化
void hal_key_gic_init(int id,int interrupt_lv){
    //获取中断id对应使能寄存器偏移量
    int address_offset = id%32;
    //获取中断id对应使能寄存器
    int re_enable = id/32;
    //
     printf("address_offset=%d,re_enable=%d\n",address_offset,re_enable);
    //GICD
    //1.使能GICD组0
    GICD->CTRL |= (0x1<<0);
    //2.设置对应中断号使能
    GICD->ISENABLER[re_enable] |= (0x1<<address_offset);
    //2.设置GICD层中断优先级
    GICD->IPRIORITYR[re_enable*8] &= (~(interrupt_lv<<(address_offset*8+3)));
    //3.设置GICD层中断分配
    GICD->ITARGETSR[re_enable*8] &= (~(0x3<<(address_offset*8)));
    GICD->ITARGETSR[re_enable*8] |= (0x1<<(address_offset*8));
     
    //1.设置GICC层组0使能
    GICC->CTRL |= (0x1<<0);
    //2.设置GICC层中断优先级
     GICC->PMR &= (~(0x1f<<3));
    GICC->PMR |= (0x1f<<3);
}