rt_kprintf串口概率输出异常

发布于 2022-06-20 00:17:40 浏览：547 订阅该版

RT-Thread Studio

版本: 2.2.3

RT-Thread系统版本4.0.2

芯片STM32G070RBT6

新建Rt-thread 项目，直接运行打印输出异常，代码如下。
```c
#include <rtthread.h>

#define DBG_TAG "main"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>
#include "stdio.h"
int main(void)
{
    int count = 1;

while (count++)
    {
        rt_kprintf("Hello RT-Thread %d!\r\n",count);
        rt_thread_mdelay(1000);
    }

return RT_EOK;
}
```

======================================
正常情况输出应该为每秒都会输出。
实际情况是每隔4秒才输出。

输出结果如下：
```
Hello RT-Thread 6!
Hello RT-Thread 10!
Hello RT-Thread 14!
Hello RT-Thread 18!
Hello RT-Thread 22!
Hello RT-Thread 26!
侶ello RT-Thread 47!
Hello RT-Thread 51!
Hello RT-Thread 55!
Hello RT-Thread 68!
Hello RT-Thread 72!
Hello RT-Thread 76!
Hello RT-Thread 89!
Hello RT-Thread 93!
Hello RT-Thread 106!
Hello RT-Thread 110!
Hello RT-Thread郒ello RT-Thread 123!
Hello RT-Thread 127!
Hello RT-Thread 136!
Hello RT-Thread 140!
Hello RT-Thread 149!
Hello RT-Thread 153!
Hello RT-Thread 162!
Hello RT-Thread 166!
Hello RT-Thread 175!
Hello RT-Thread 179!
Hello RT-Thread 188!
Hello RT-Thread 197!
Hello RT-Thread 201!
Hello RT-Thread 210!
Hello RT-Thread 219!
Hello RT-Thread 223!
Hello RT-Thread 232!
Hello RT-Thread 241!
Hello RT-Thread 245!
Hello RT-Thread 250!Hello RT-Thread 254!
Hello RT-Thread 263!
Hello RT-Thread 272!
Hello RT-Thread 281!
Hello RT-Thread 290!
Hello RT-Thread 294!
Hello RT-Thread 299!
Hello RT-Thread 303!
Hello RT-Thread 308!
Hello RT-Thread 312!
Hello RT-ThreHello RT-Thread 321!
Hello RT-THello RT-Thread 330!
Hello RT鼿ello RT-Thread 339!
Hello RT-Thread 348!
Hello RT-Thread 357!
Hello RT-Thread 362!
Hello RT-Thread 366!
Hello RT-Thread 371!
X毢?
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Hello RT-Thread 380!
Hello RT-Thread 389!
Hello RT-Thread 398!
Hello RT-Thread 407!
Hello RT-Thread 416!
Hello RT-Thread 421!
Hello RT-Thread 425!
Hello RT-Thread 430!
Hello RT-Thread 439!
Hello RT-Thread 448!
Hello RT-Thread 457!
Hello RT-Thread 462!
Hello RT-Thread 466!
Hello RT-Thread 471!
```