ulog

ULOG的LOG_HEX不打印

发布于 2022-03-11 18:26:47 浏览：1397 订阅该版

mysterywolf 认证专家 2022-03-27

https://github.com/mysterywolf

2 个回答

parjing 2022-03-14

认真学习

经过测试，新的ULOG代码在异步时，使用ringbuff进行线程间通信，而
![image.png](https://oss-club.rt-thread.org/uploads/20220314/3976dc0470a822581f199ebd29a0cdd3.png)
ringbuff只在函数ulog_raw里面初始化
```
void ulog_raw(const char *format, ...)
{
    rt_size_t log_len = 0;
    char *log_buf = NULL;
    va_list args;
    int fmt_result;

RT_ASSERT(ulog.init_ok);

#ifdef ULOG_USING_ASYNC_OUTPUT
    if (ulog.async_rb == NULL)
    {
        ulog.async_rb = rt_ringbuffer_create(ULOG_ASYNC_OUTPUT_BUF_SIZE);
    }
#endif

/* get log buffer */
    log_buf = get_log_buf();

/* lock output */
    output_lock();
    /* args point to the first variable parameter */
    va_start(args, format);

#ifdef ULOG_OUTPUT_FLOAT
    fmt_result = vsnprintf(log_buf, ULOG_LINE_BUF_SIZE, format, args);
#else
    fmt_result = rt_vsnprintf(log_buf, ULOG_LINE_BUF_SIZE, format, args);
#endif /* ULOG_OUTPUT_FLOAT */

va_end(args);

/* calculate log length */
    if ((fmt_result > -1) && (fmt_result <= ULOG_LINE_BUF_SIZE))
    {
        log_len = fmt_result;
    }
    else
    {
        log_len = ULOG_LINE_BUF_SIZE;
    }

/* do log output */
    do_output(LOG_LVL_DBG, NULL, RT_TRUE, log_buf, log_len);

/* unlock output */
    output_unlock();
}
```
我认为在这里初始化不怎么准确，而是应该放在ulog_async_init函数里面
```
int ulog_async_init(void)
{
    /* 此处为新增给ringbuff初始化*/
    if (ulog.async_rb == NULL)
    {
        ulog.async_rb = rt_ringbuffer_create(ULOG_ASYNC_OUTPUT_BUF_SIZE);
    }
    if (ulog.async_th == NULL)
    {
        /* async output thread */
        ulog.async_th = rt_thread_create("ulog_async", async_output_thread_entry, &ulog, ULOG_ASYNC_OUTPUT_THREAD_STACK,
                ULOG_ASYNC_OUTPUT_THREAD_PRIORITY, 20);
        if (ulog.async_th == NULL)
        {
            rt_kprintf("Error: ulog init failed! No memory for async output thread.\n");
            return -RT_ENOMEM;
        }
        /* async output thread startup */
        rt_thread_startup(ulog.async_th);
    }
    return 0;
}
```