5 线程运行频率与设定频率不相符

发布于 2022-03-29 10:14:03 浏览：591 订阅该版

线程入口函数里写的是500ms刷新一次显示程序，但是从显示屏上看到的是2000ms才刷新一次，请问是什么问题？
```c
void Display_Time_entry(void *parameter)
{
    while (1)
    {
        now = time(RT_NULL);
//      rt_kprintf("%.*s\n", 25, ctime(&now));
        strcpy(buf,ctime(&now)) ;

ssd1306_SetCursor(0, 50);
        ssd1306_ShowNumber(0, 0, buf[11]-48, Font_7x10, White);
        ssd1306_ShowNumber(1, 0, buf[12]-48, Font_7x10, White);

ssd1306_SetCursor(14, 50);
        ssd1306_WriteChar(':', Font_7x10, White);

ssd1306_SetCursor(0, 50);
        ssd1306_ShowNumber(3, 0, buf[14]-48, Font_7x10,  White);
        ssd1306_ShowNumber(4, 0, buf[15]-48, Font_7x10, White);

ssd1306_SetCursor(35, 50);
        ssd1306_WriteChar(':', Font_7x10, White);

ssd1306_SetCursor(0, 50);
        ssd1306_ShowNumber(6, 0, buf[17]-48, Font_7x10, White);
        ssd1306_ShowNumber(7, 0, buf[18]-48, Font_7x10, White);

rt_thread_delay(500);

}
}

int Display_Time_Thread(void)
{
    rt_thread_t Display_Time= RT_NULL;

Display_Time = rt_thread_create("Display_Time",
                                      Display_Time_entry,
                                      RT_NULL,
                                      512,
                                      10,
                                      20);
    if (Display_Time != RT_NULL)
    {
        rt_thread_startup(Display_Time);
    }

return RT_EOK;
}
```
![image.png](https://oss-club.rt-thread.org/uploads/20220329/9f4a19f50fbeb3dce6b7b493b46a8c29.png)