RS485软件包和串口如何使用？

发布于 2022-10-31 16:10:08 浏览：1488 订阅该版

1 个回答

crystal266 2022-10-31

嵌入式

1 控制台线程在文件 rt-thread/components/finsh/shell.c 中，线程的入口函数是 `finsh_thread_entry`，如果想改为 RS485 的就需要在里面修改，改起来还是有一些麻烦的，建议板子上预留一个普通串口做控制台。
```c
void finsh_thread_entry(void *parameter)
{
    int ch;

/* normal is echo mode */
#ifndef FINSH_ECHO_DISABLE_DEFAULT
    shell->echo_mode = 1;
#else
    shell->echo_mode = 0;
#endif

#ifndef FINSH_USING_MSH_ONLY
    finsh_init(&shell->parser);
#endif

#if !defined(RT_USING_POSIX) && defined(RT_USING_DEVICE)
    /* set console device as shell device */
    if (shell->device == RT_NULL)
    {
        rt_device_t console = rt_console_get_device();
        if (console)
        {
            finsh_set_device(console->parent.name);
        }
    }
#endif

```

2 控制行输入的命令示例如下：比如 rs485 create uart3 9600 0 1 1
```c
static const char *cmd_info[] =
{
    "Usage: \n",
    "rs485 create [serial] [baudrate] [parity] [pin] [level] - create rs485 instance.\n",
    "rs485 destory                                           - destory rs485 instance.\n",
    "rs485 set_recv_tmo [tmo_ms]                             - set recieve timeout.\n",
    "rs485 set_byte_tmo [tmo_ms]                             - set byte timeout.\n",
    "rs485 connect                                           - open rs485 connect.\n",
    "rs485 disconn                                           - close rs485 connect.\n",
    "rs485 recv [size]                                       - receive from rs485.\n",
    "rs485 send [size]                                       - send to rs485.\n",
    "rs485 cfg [baudrate] [databits] [parity] [stopbits]     - config rs485.\n",
    "rs485 send_then_recv [send_size] [recv_size]            - send to rs485 and then receive from rs485.\n",
    "\n"
};
```