AT UART

AT组件如何解析数据里面包含(\r\n)数据?

发布于 2020-08-27 13:46:49 浏览：2041 订阅该版

geniusgogo 认证专家 2020-08-27

这家伙很懒，什么也没写！

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5 个回答

红枫认证专家 2020-08-27

这家伙很懒，什么也没写！

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ching 2020-09-02

这家伙很懒，什么也没写！

```c
static int at_recv_readline(at_client_t client)
{
    rt_size_t read_len = 0;
    char ch = 0, last_ch = 0;
    rt_bool_t is_full = RT_FALSE;

rt_memset(client->recv_line_buf, 0x00, client->recv_bufsz);
    client->recv_line_len = 0;

while (1)
    {
        at_client_getchar(client, &ch, RT_WAITING_FOREVER);

if (read_len < client->recv_bufsz)
        {
            client->recv_line_buf[read_len++] = ch;
            client->recv_line_len = read_len;
        }
        else
        {
            is_full = RT_TRUE;
        }

/* is newline or URC data */
        if ((ch == '\n' && last_ch == '\r') || (client->end_sign != 0 && ch == client->end_sign)
                || get_urc_obj(client))
        {
            if (is_full)
            {
                LOG_E("read line failed. The line data length is out of buffer size(%d)!", client->recv_bufsz);
                rt_memset(client->recv_line_buf, 0x00, client->recv_bufsz);
                client->recv_line_len = 0;
                return -RT_EFULL;
            }
            break;
        }
        last_ch = ch;
    }

#ifdef AT_PRINT_RAW_CMD
    at_print_raw_cmd("recvline", client->recv_line_buf, read_len);
#endif

return read_len;
}

static void client_parser(at_client_t client)
{
    const struct at_urc *urc;

while(1)
    {
        if (at_recv_readline(client) > 0)
        {
            if ((urc = get_urc_obj(client)) != RT_NULL)
            {
                /* current receive is request, try to execute related operations */
                if (urc->func != RT_NULL)
                {
                    urc->func(client, client->recv_line_buf, client->recv_line_len);
                }
            }
            else if (client->resp != RT_NULL)
            {
                at_response_t resp = client->resp;

/* current receive is response */
                client->recv_line_buf[client->recv_line_len - 1] = '\0';
                if (resp->buf_len + client->recv_line_len < resp->buf_size)
                {
                    /* copy response lines, separated by '\0' */
                    rt_memcpy(resp->buf + resp->buf_len, client->recv_line_buf, client->recv_line_len);

/* update the current response information */
                    resp->buf_len += client->recv_line_len;
                    resp->line_counts++;
                }
                else
                {
                    client->resp_status = AT_RESP_BUFF_FULL;
                    LOG_E("Read response buffer failed. The Response buffer size is out of buffer size(%d)!", resp->buf_size);
                }
                /* check response result */
                if (rt_memcmp(client->recv_line_buf, AT_RESP_END_OK, rt_strlen(AT_RESP_END_OK)) == 0
                        && resp->line_num == 0)
                {
                    /* get the end data by response result, return response state END_OK. */
                    client->resp_status = AT_RESP_OK;
                }
                else if (rt_strstr(client->recv_line_buf, AT_RESP_END_ERROR)
                        || (rt_memcmp(client->recv_line_buf, AT_RESP_END_FAIL, rt_strlen(AT_RESP_END_FAIL)) == 0))
                {
                    client->resp_status = AT_RESP_ERROR;
                }
                else if (resp->line_counts == resp->line_num && resp->line_num)
                {
                    /* get the end data by response line, return response state END_OK.*/
                    client->resp_status = AT_RESP_OK;
                }
                else
                {
                    continue;
                }

client->resp = RT_NULL;
                rt_sem_release(client->resp_notice);
            }
            else
            {
//                log_d("unrecognized line: %.*s", client->recv_line_len, client->recv_line_buf);
            }
        }
    }
}
```