AT Command

/**
 * @brief AT适配器
 */
static const at_adapter_t at_adapter = {
    .lock          = at_mutex_lock，           //多任务上锁(非OS下填NULL)
    .unlock        = at_mutex_unlock，         //多任务解锁(非OS下填NULL)
    .write         = at_device_write，         //数据写接口(非阻塞式)
    .read          = at_device_read，          //数据读接口(非阻塞式)
    .debug         = at_debug，                //调试打印接口(不需要则填NULL) 
    .recv_bufsize  = 256                       //接收缓冲区大小(按实际情况填写)
};

    at_obj_t *at_obj;
    //....
    at_obj = at_obj_create(&at_adapter);
    if (at_obj == NULL) {
        printf("at object create failed\r\n");
    }  
    //...

/**
 * @brief 轮询程序
 */
void at_device_process(void)
{
    static unsigned int timer;
    //为了加快AT命令处理响应速度，建议5ms以内轮询一次
    if (get_tick() - timer > 5) {
        timer = get_tick();
        at_obj_process(&at_obj);
    }    
}

=>  AT+CSQ
<=  +CSQ: <rssi>，<ber>
<=  OK

/**
 * @brief  命令响应处理程序
 */
static void csq_respose_callback(at_response_t *r)   
{
    int rssi， ber;
    //+CSQ: <rssi>，<ber>
    if (r->code == AT_RESP_OK) {
        //命令响应成功后，解析出rssi，ber.
        if (sscanf(r->prefix， "+CSQ:%d，%d"， &rssi， &ber) == 2) {
            printf("rssi:%d， ber:%d\r\n"， rssi， ber);
        }
    } else {
        printf("'CSQ' command response failed!\r\n");
    }
}  
/**
 * @brief  读CSQ值请求
 */
static void read_csq(void)
{
    //发送命令，超时时间为1000ms，重发次数为0
    at_send_singlline(at_obj， csq_respose_callback， 1000， 0， "AT+CSQ"); 
}

    cd ./at_chat/samples/linux
    make clean & make
    ./output/demo

*******************************************************
This is an asynchronous AT command framework.
Author:roger.luo, Mail:morro_luo@163.com
*******************************************************

Please input test item:
        1:Display memory information.
        2:Testing singlline command.
        3:Testing multiline commands.
        4:Testing variable parameter command.
        5:Testing response timeout retry.
        6:Testing response error retry.
        7:Testing command abort.
        8:Testing specific response prefix.
        9:Testing custom command.
        10:Testing buffer send.
        11:Testing 'at_do_work' 1.
        12:Testing read binary data via 'at work'.
        13:Testing capture unsolicited binary data.
        14:Testing at context interface.
*******************************************************
<=
+POWER:1
 ...
Device power on event detected!