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  • <div><p>Docs for <code>ble_gap_ext_adv_start</code> say duration is in ms, which is the same as for the legacy <code>ble_gap_adv_start</code> function, however this duration param appears to be passed...
  • segment gap

    2020-12-06 09:36:20
    vod_segment_duration 4000; vod dash; add_header Access-Control-Allow-Headers '*'; add_header Access-Control-Expose-Headers 'Server,range,Content-Length,Content-Range'; add_header ...
  • order_id : 1234 points to Order data : { username : xyz, duration: 2 months, membership_type: platinum } etc ..... so callback urls change for each users who is going to generate those new addresses ...
  • H.264 gap robustness

    2021-01-12 03:55:23
    - try playing back the resulting file in Quicktime and WMP and observe that the video plays, freezing on a single frame for the duration of the gap and then continuing <p>Given that the ffmpeg genpts ...
  • If I set event gap to 1 motion triggers 10-11 events of the same jpg. Another problem: Why it generates 10-11 jpegs with the same image? I can change the sources, It's not the first time I do it,...
  • Split extra gap duration between previous and next subtitle Number of short gaps trimmed: [--] Gap after (s) // last table column heading </code></pre>该提问来源于开源项目:SubtitleEdit/...
  • _gap.startScan(ble::scan_duration_t(100)); if (error) { print_error(error, "Error caused by Gap::startScan\r\n"); return; } printf("Scanning started\r\n"); </code></pre> <p>...
  • - When we reset the movie start_time, we store last_pts into base_pts plus 1 frame duration, because it takes at least 1 frame to change cnt->detecting_motion state. In effect, this gives us a ...
  • duration="PT6.4S"> <adaptationset id="0" contenttype="audio" lang="en" segmentalignment="true"> <role schemeiduri="...
  • _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE, test_duration); /* for example, ble::adv_duration_t test_duration(5000) for 5s timeout. */ </code></pre> <p>But we observed that BLE ...
  • should be the exact duration from the start of shot n to the start of shot n+1. This allows the exposure to be varied without changing the timelapse speed. What version of the product are you...
  • It took him about an hour, going by the duration of the 50x speed montage. He used a loose piece of rail that jumped around. Crappy anvil, jumping around, so I'd say it is anvil 1? Maybe this ...
  • while the actual gap may depend on how quickly the app recovers. </li><li> <p>Another thought is to introduce optional app checks b/w kills (though I wouldn't personally recommend it, one of the ...
  • (If the gap beetween subtitles is bigger than 100/150ms, only selected subtitle is affected)</li><li>Increase/decrease a subtitle frame by frame at the end of subtitle, but dragging the following ...
  • The two linear ramps of the same duration and starting time should cancel each other out perfectly in this scenario. <p>Observed Result: Even though we set the start time of the second source to be ...
  • shakaAssets.Feature.SEGMENT_LIST_DURATION, shakaAssets.Feature.HIGH_DEFINITION ], licenseServers: { 'com.microsoft.playready': 'https://content.uplynk.com/pr', '...
  • 一、背景 **链路层(LL)**控制设备的...GAP通信中角色,**中心设备(Central - 主机)**用来扫描和连接 外围设备(Peripheral - 从机)。 二、配置扫描参数 2.1 扫描参数相关宏 #define DEFAULT_SCAN_DURATION ...

    一、背景

    链路层(LL)控制设备的射频状态,有五个设备状态:待机、广播、扫描、初始化和连接。

    广播 为广播数据包,而 扫描 则是监听广播。

    GAP通信中角色,中心设备(Central - 主机)用来扫描和连接 外围设备(Peripheral - 从机)。

    本篇是关于配置以及启动或关闭扫描的流程,解析扫描到的广播数据包查看 CC2640R2F学习笔记(18)——GAP主机端获取从机广播数据

    二、配置扫描参数

    2.1 扫描参数相关宏

    // Enable/Disable Unlimited Scanning Feature
    #define ENABLE_UNLIMITED_SCAN_RES             FALSE
    
    // Maximum number of scan responses
    // this can only be set to 15 because that is the maximum
    // amount of item actions the menu module supports
    #define DEFAULT_MAX_SCAN_RES                  15
    
    #define DEFAULT_SCAN_DURATION                 4000   // 值越小,则发现的同一设备广播包越多
    #define DEFAULT_SCAN_WIND                     80
    #define DEFAULT_SCAN_INT                      80
    

    2.2 配置GAP参数值

    以SDK2.4 multi_role工程为例,在 multi_role_init() 初始化多角色应用程序函数中,

    /*===================================== 主机 =====================================*/
    /*------------------- 扫描参数 -------------------*/
    // 扫描处理周期,周期越短,处理次数越多
    GAP_SetParamValue(TGAP_GEN_DISC_SCAN, DEFAULT_SCAN_DURATION);
    
    // 扫描间隔
    GAP_SetParamValue(TGAP_CONN_SCAN_INT, DEFAULT_SCAN_INT);
    GAP_SetParamValue(TGAP_CONN_SCAN_WIND, DEFAULT_SCAN_WIND);
    GAP_SetParamValue(TGAP_CONN_HIGH_SCAN_INT, DEFAULT_SCAN_INT);
    GAP_SetParamValue(TGAP_CONN_HIGH_SCAN_WIND, DEFAULT_SCAN_WIND);
    GAP_SetParamValue(TGAP_GEN_DISC_SCAN_INT, DEFAULT_SCAN_INT);
    GAP_SetParamValue(TGAP_GEN_DISC_SCAN_WIND, DEFAULT_SCAN_WIND);
    GAP_SetParamValue(TGAP_LIM_DISC_SCAN_INT, DEFAULT_SCAN_INT);
    GAP_SetParamValue(TGAP_LIM_DISC_SCAN_WIND, DEFAULT_SCAN_WIND);
    GAP_SetParamValue(TGAP_CONN_EST_SCAN_INT, DEFAULT_SCAN_INT);
    GAP_SetParamValue(TGAP_CONN_EST_SCAN_WIND, DEFAULT_SCAN_WIND);
    

    2.3 配置GAP角色规范(Role Profile)

    以SDK2.4 multi_role工程为例,在 multi_role_init() 初始化多角色应用程序函数中,

     /*===================================== 主机 =====================================*/
    /*------------------- 扫描参数 -------------------*/
    // 设置扫描回应设备数
    uint8_t scanRes = 0;
    // In case that the Unlimited Scanning feature is disabled
    // send the number of scan results to the GAP
    if(ENABLE_UNLIMITED_SCAN_RES == FALSE)
    {
        scanRes = DEFAULT_MAX_SCAN_RES;    // 最大扫描回应设备数,如果广播的从机超过了15个,只能扫描到先回应的从机
    }
    
    GAPRole_SetParameter(GAPROLE_MAX_SCAN_RES, sizeof(uint8_t), &scanRes, NULL);
    

    三、执行扫描

    3.1 正在扫描标志

    以SDK2.4 multi_role工程为例,multi_role.c中局部变量

    static bool scanningStarted = FALSE;
    

    3.2 执行扫描函数

    原mr_doScan函数修改后

    /**
     @brief 执行扫描函数
     @param index 1 - 开启扫描;0 - 取消扫描
     @return TRUE - 成功;FALSE - 失败
    */
    bool mr_doScan(uint8_t index)
    {
        if(index)                                                           // 执行扫描
        {
            if(linkDB_NumActive() < maxNumBleConns)                         // 如果连接设备数未饱和
            {
                if(!scanningStarted)                                        // 不在扫描中
                {
                    scanningStarted = TRUE;                                 // 开始扫描标志置一
    
                    GAPRole_StartDiscovery(DEFAULT_DISCOVERY_MODE,          // 开始扫描
                                           DEFAULT_DISCOVERY_ACTIVE_SCAN,
                                           DEFAULT_DISCOVERY_WHITE_LIST);
    
                    return TRUE;
                }
                else                                                        // 正在扫描中
                {
                    return FALSE;
                }
            }
            else                                                            // 连接设备数饱和
            {
                return FALSE;
            }
        }
        else                                                                // 取消扫描
        {
            GAPRole_CancelDiscovery();
            return TRUE;
        }
    }
    

    四、开机扫描

    以SDK2.4 multi_role工程为例,在 multi_role_processRoleEvent() 处理多角色事件函数中,

    switch(pEvent->gap.opcode)
    {
        /*================================== 设备初始化完成事件 ==================================*/
        case GAP_DEVICE_INIT_DONE_EVENT:
        {
          ```
          ```
          mr_doScan(1);     // 开启扫描
        }
        break;
    }
    

    五、循环扫描

    以SDK2.4 multi_role工程为例,在 multi_role_processRoleEvent() 处理多角色事件函数中,

    switch(pEvent->gap.opcode)
    {
        /*===================================== 扫描完成事件 =====================================*/
        case GAP_DEVICE_DISCOVERY_EVENT:
        {
          if(pEvent->gap.hdr.status == SUCCESS)
          {
            uint8_t i;
    
            // 扫描完成,清除正在扫描标志
            scanningStarted = FALSE;
            ```
            ```
          }
    
          mr_doScan(1);    // 继续扫描
        }
        break;
    }
    

    • 由 Leung 写于 2019 年 3 月 21 日

    • 参考:simplelink_cc2640r2_sdk_2_40_00_32 [提取码:3pg6]

    展开全文
  • I dunno if this is expected due to #204 but it is really annoying, because more than often I have to reposition the handles because I want the gap. Especially when I made a cross with a strip that I ...
  • <p>Since last few days I am seeing an Cronjob failed email starting with 1 website and then a Cronjob execution successful email for another website after a gap of 1 hour. <p>Due to timezone ...
  • s no time gap between them, the new subtitle has a duration of -0.001. If I insert several more new subtitles after that, they all have a duration of -0.001, and the same start time as the first new ...
  • Approx a gap of 2 mins between every task. <h3>Your FULL config.json (remove your username, password, gmapkey and any other private info) <pre><code> { "auth_service": "ptc", "...
  • This matches up to the segment number of 799 with a segment duration of 2s. If I search to a timestamp in the video larger than 1598.033333, the video plays normally but fails as soon as I seek back...
  • 1. Only the pre-defined exposure times can be used and there is a big gap between 5 and 10 seconds. 2. 3. What is the expected output? What do you see instead? Please use labels and text to ...
  • <div><p>Create a ... await Future.delayed(Duration(seconds: 2)); print('abc'); } } <p>Put a breakpoint on the print statement and continue through it a few times. The call stack show as ...
  • <p>Here is a sample m3u8 list format, note the large gap between 50min:06s to 51min:04s, or jump for 54:58 to 25:08 of next hour. <h1>EXTM3U <h1>EXT-X-VERSION:7 <h1>EXT-X-TARGETDURATION:5 <h1>EXT-X-...
  • 函数 [f0_time,f0_value,SHR,f0_candidates]= pdaufft(audio_in,Fs,FFT_sample_duration,pda_threshold,audio_gap_time,CHECK_VOICING,med_smooth) %******************************************************** ****...
  • (total_length-train_duration-gap_duration)//valid_duration -- time_shift = valid_duratiopn n_possible_splits/n_slits so the CV spans the whole dataset. If train_duration is not passed but n_...
  • start(duration=10) [D][FreeRTOS.cpp:165] take(): Semaphore taking: name: ScanEnd (0x3ffdf3ec), owner: <n> for start [D][FreeRTOS.cpp:174] take(): Semaphore taken: name: ScanEnd (0x3ffdf3ec)...
  • mpd_utils.js:275 SegmentTimeline contains a large gap/overlap. The content may have errors in it. s…a.d…h.mpd.SegmentTimePoint {startTime: 6759155760, duration: 900480, repeat: 298} mpd_utils.js:275...
  • 扫描到的设备将会通过ESP_GAP_BLE_SCAN_RESULT_EVT事件返回,最后当duration超时时,会通过ESP_GAP_SEARCH_INQ_CMPL_EVT事件返回。 二、我的问题以及解决办法 项目中,我利用gatt client 作为中心设备,将gatt ...

    一、BLE 扫描流程
    在 ESP32 中,扫描设备主要是通过调⽤用esp_ble_gap_set_scan_params来设置扫描时的参数,然后调⽤用esp_ble_gap_start_scanning开始扫描。扫描到的设备将会通过ESP_GAP_BLE_SCAN_RESULT_EVT事件返回,最后当duration超时时,会通过ESP_GAP_SEARCH_INQ_CMPL_EVT事件返回。
    二、我的问题以及解决办法
    项目中,我利用gatt client 作为中心设备,将gatt server作为从设备,两者工作方式分别设计为 gatt client 持续工作,不断电,不停机。而gatt server 端设计由电池供电,这样的话,由于是电池供电,就存在server断电停机的可能,为了实现server重新上电后,两者必须立马建立新的连接,这样就要求 server停机后 client 进行永久扫描状态,esp_ble_gap_start_scanning就是扫描函数,其中duration参数用于设置扫描时长,单位为秒,但是我一直没找到如何实现永久扫面 我尝试将 duration=0xFFFF,也就是扫描65536秒 65536秒=18.02小时,这样还是不能实现永久扫描,我查阅相关资料,终于在一个小地方找到了这个方法,因此做个笔记,记录一下。

    当 duration 值为 0 时,将会永久扫描⽽而不不产⽣生超时。
    在这里插入图片描述

    展开全文

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