串口中断发送在rt_show_version()时发生发送非空时，程序挂掉

发布于 2019-07-30 17:33:18 浏览：1620 订阅该版

当Finsh串口工作在中断发送时，在运行到`rt_show_version()`里打印信息时，
```c
if (serial->ops->putc(serial, *(char*)data) == -1)  <font color="#ff0000">//当put由于发送非空返回-1时</font>
        {
    rt_completion_wait(&(tx->completion), RT_WAITING_FOREVER); //运行到这里
    continue;
        }
```

```c
rt_err_t rt_completion_wait(struct rt_completion *completion,
                            rt_int32_t            timeout)
{
    rt_err_t result;
    rt_base_t level;
    rt_thread_t thread;
    RT_ASSERT(completion != RT_NULL);

result = RT_EOK;
    thread = rt_thread_self(); //由于此时在rt_show_version()处，尚未建立任务这里返回0x00000

level = rt_hw_interrupt_disable();
    if (completion->flag != RT_COMPLETED)
    {
        /* only one thread can suspend on complete */
        RT_ASSERT(rt_list_isempty(&(completion->suspended_list)));

if (timeout == 0)
        {
            result = -RT_ETIMEOUT;
            goto __exit;
        }
        else
        {
            /* reset thread error number */
            thread->error = RT_EOK;

/* suspend thread */
            rt_thread_suspend(thread); //这里会报错
            /* add to suspended list */
            rt_list_insert_before(&(completion->suspended_list),
                                  &(thread->tlist));

/* current context checking */
            RT_DEBUG_NOT_IN_INTERRUPT;

/* start timer */
            if (timeout > 0)
            {
                /* reset the timeout of thread timer and start it */
                rt_timer_control(&(thread->thread_timer),
                                 RT_TIMER_CTRL_SET_TIME,
                                 &timeout);
                rt_timer_start(&(thread->thread_timer));
            }
            /* enable interrupt */
            rt_hw_interrupt_enable(level);

/* do schedule */
            rt_schedule();

/* thread is waked up */
            result = thread->error;

level = rt_hw_interrupt_disable();
        }
    }
    /* clean completed flag */
    completion->flag = RT_UNCOMPLETED;

__exit:
    rt_hw_interrupt_enable(level);

return result;
}
```
程序会运行出错。。

解决方法：
finsh控制台不使用中断发送