结构体作为全局变量有问题？

发布于 2021-09-11 17:25:49 浏览：1704 订阅该版

出出啊 2021-09-11

恃人不如自恃，人之为己者不如己之自为也

骁骑校尉 2021-09-11

这家伙很懒，什么也没写！

出出啊 2021-09-11

恃人不如自恃，人之为己者不如己之自为也

骁骑校尉 2021-09-11

这家伙很懒，什么也没写！

出出啊 2021-09-11

恃人不如自恃，人之为己者不如己之自为也

骁骑校尉 2021-09-11

这家伙很懒，什么也没写！

出出啊 2021-09-11

恃人不如自恃，人之为己者不如己之自为也

出出啊 2021-09-11

恃人不如自恃，人之为己者不如己之自为也

骁骑校尉 2021-09-11

这家伙很懒，什么也没写！

骁骑校尉 2021-09-11

这家伙很懒，什么也没写！

@出出啊 老哥，我凌乱了，我重新复述一下我现在的代码
pid.c和.h中
```
/*结构体成员的定义*/
typedef struct
{
    float A0;          /**< The derived gain, A0 = Kp + Ki + Kd . */
    float A1;          /**< The derived gain, A1 = -Kp - 2Kd. */
    float A2;          /**< The derived gain, A2 = Kd . */
    float state[3];    /**< The state array of length 3. */
    float Kp;               /**< The proportional gain. */
    float Ki;               /**< The integral gain. */
    float Kd;               /**< The derivative gain. */
    float out;              /***输出****/
} pid_instance_f32;
/*初始化函数，这里修改为了传入指针，当然等会实例化结构体的时候(在main.c中)也有一点区别*/
void PidInit(pid_instance_f32 *pidCtrl_sp)
{
    pidCtrl_sp[0].Kp=0.5;
    pidCtrl_sp[0].Ki=1;
    pidCtrl_sp[0].Kd=0;
    pidCtrl_sp[0].out=0;
    pidCtrl_sp[0].A0 = pidCtrl_sp[0].Kp + pidCtrl_sp[0].Ki + pidCtrl_sp[0].Kd;
    pidCtrl_sp[0].A1 = -pidCtrl_sp[0].Kp - 2*pidCtrl_sp[0].Kd;
    pidCtrl_sp[0].A2 = pidCtrl_sp[0].Kd;
    sprintf(str_pr,"pidCtrl_sp.A0=%f\n",pidCtrl_sp[0].A0);
    rt_kprintf(str_pr);
    sprintf(str_pr,"pidCtrl_sp.A1=%f\n",pidCtrl_sp[0].A1);
    rt_kprintf(str_pr);
    sprintf(str_pr,"pidCtrl_sp.Kp=%f\n",pidCtrl_sp[0].Kp);
    rt_kprintf(str_pr);
    rt_kprintf("\n");
}
/*打印结构体成员数据的函数*/
void show_para(pid_instance_f32 *pidCtrl_sp)
{
    sprintf(str_pr,"pidCtrl_sp.A0=%f\n",pidCtrl_sp[0].A0);
    rt_kprintf(str_pr);
    sprintf(str_pr,"pidCtrl_sp.A1=%f\n",pidCtrl_sp[0].A1);
    rt_kprintf(str_pr);
    sprintf(str_pr,"pidCtrl_sp.Kp=%f\n",pidCtrl_sp[0].Kp);
    rt_kprintf(str_pr);
}
```
接下来是main.c中
```
int main(void)
{
    pid_instance_f32 *pidCtrl_sp = rt_malloc(1 * sizeof(pid_instance_f32));
    PidInit(pidCtrl_sp);
    show_para(pidCtrl_sp);
    while(1){
    ...}
```
这种情况下能够正常打印
![image.png](https://oss-club.rt-thread.org/uploads/20210911/71d7215554051cafaff611573988b859.png)