AT指令文档

调用树

at_client_init();
	at_client_para_init();
		client_parser();

struct at_client
{
    rt_device_t device;

    at_status_t status;
    char end_sign;

    char *send_buf;
    /* The maximum supported send cmd length */
    rt_size_t send_bufsz;
    /* The length of last cmd */
    rt_size_t last_cmd_len;

    /* the current received one line data buffer */
    char *recv_line_buf;
    /* The length of the currently received one line data */
    rt_size_t recv_line_len;
    /* The maximum supported receive data length */
    rt_size_t recv_bufsz;
    rt_sem_t rx_notice;
    rt_mutex_t lock;

    at_response_t resp;
    rt_sem_t resp_notice;
    at_resp_status_t resp_status;

    struct at_urc_table *urc_table;
    rt_size_t urc_table_size;
    const struct at_urc *urc;

    rt_thread_t parser;
};

#define at_exec_cmd(resp, ...)                   at_obj_exec_cmd(at_client_get_first(), resp, __VA_ARGS__)
#define at_client_wait_connect(timeout)          at_client_obj_wait_connect(at_client_get_first(), timeout)
#define at_client_send(buf, size)                at_client_obj_send(at_client_get_first(), buf, size)
#define at_client_recv(buf, size, timeout)       at_client_obj_recv(at_client_get_first(), buf, size, timeout)
#define at_set_end_sign(ch)                      at_obj_set_end_sign(at_client_get_first(), ch)
#define at_set_urc_table(urc_table, table_sz)    at_obj_set_urc_table(at_client_get_first(), urc_table, table_sz)

AT指令发-收处理例程

/* disable echo */
 if (at_obj_exec_cmd(device->client, resp, "ATE0") != RT_EOK)
  {
      result = -RT_ERROR;
      goto __exit;
  }
  /* disable sleep mode  */
  if (at_obj_exec_cmd(device->client, resp, "AT+QSCLK=0") != RT_EOK)
  {
      result = -RT_ERROR;
      goto __exit;
  }
  /* Get the baudrate */
  if (at_obj_exec_cmd(device->client, resp, "AT+IPR?") != RT_EOK)
  {
      result = -RT_ERROR;
      goto __exit;
  }
/* check signal strength */
for (i = 0; i < CSQ_RETRY; i++)
{
    rt_thread_mdelay(1000);
    if (at_obj_exec_cmd(device->client, resp, "AT+CSQ") == RT_EOK)
    {
        int signal_strength = 0, err_rate = 0;

        if (at_resp_parse_line_args_by_kw(resp, "+CSQ:", "+CSQ: %d,%d", &signal_strength, &err_rate) > 0)
        {
            if ((signal_strength != 99) && (signal_strength != 0))
            {
                LOG_D("%s device signal strength: %d, channel bit error rate: %d",
                      device->name, signal_strength, err_rate);
                break;
            }
        }
    }
}