typedef应用

//#include

#define p(...) printf(__VA_ARGS__)

typedef struct xxx_reg{
    unsigned long reg1;
    unsigned long reg2;
    unsigned long reg3;
    unsigned long reg4;
    unsigned long reg5;
    unsigned long reg6;
    unsigned long reg7;
    unsigned long reg8;
    unsigned long reg9;
    unsigned long reg10;
    unsigned long reg11;
}xxx_reg_t1,xxx_reg_t2;     /*struct xxx_reg,xxx_reg_t1,xxx_reg_t2三个可以通用，害的我半天没有编译通过
                             这个技巧用来对那些长度不等的寄存器进行寻址和操作，
                             可以省去一堆的 #define REG1 *(volatile unsigned long *)0x30008000*/

struct xxx_reg_t *sp = (struct xxx_reg_t *)0x30008000;
int main(void)
{


    //sp->reg1 = 0x12121212;
    p("%x\n",(&sp->reg1));
    p("%x\n",(&sp->reg1));
    p("%x\n",(&sp->reg2));
    p("%x\n",(&sp->reg3));
    p("%x\n",(&sp->reg4));
    p("%x\n",(&sp->reg5));
    p("%x\n",(&sp->reg6));
    p("%x\n",(&sp->reg7));
    p("%x\n",(&sp->reg8));
    p("%x\n",(&sp->reg9));
    p("%x\n",(&sp->reg10));
    p("%x\n",(&sp->reg11));

    sp->reg1 &= ~(1<<11);    /*没有os就不会报错了*/
    return 0;
}
运行结果：
lzd@lzd-laptop:~/c_test$ ./a.out
30008000
30008000
30008004
30008008
3000800c
30008010
30008014
30008018
3000801c
30008020
30008024
30008028
Segmentation fault
lzd@lzd-laptop:~/c_test$