初学Zigbee，做完第一个实验有几个问题想请教一下，希望可以回复的详细点。

a285051244

第一个实验是这样的，终端给协调器发送  D1  ，协调器接收到以后LED1闪烁并给终端发送 D1使终端LED1也闪烁。下面是sampleApp.c的代码。我有几个不懂的地方：
1.所有用户任务程序都是写在sampleApp.c里，终端和协调运行程序时处理事件顺序是怎么规定的。
2.以下程序怎么实现终端先给协调器发D1，然后协调器给终端再发D1。
3.程序中有写组播方式，和广播方式 ，最后为什么又是广播发送的。
void SampleApp_Init( uint8 task_id )
{ 
  SampleApp_TaskID = task_id;   //osal分配的任务ID随着用户添加任务的增多而改变
  SampleApp_NwkState = DEV_INIT;//设备状态设定为ZDO层中定义的初始化状态
  SampleApp_TransID = 0;        //消息发送ID（多消息时有顺序之分）
  
  // Device hardware initialization can be added here or in main() (Zmain.c).
  // If the hardware is application specific - add it here.
  // If the hardware is other parts of the device add it in main().

 #if defined ( BUILD_ALL_DEVICES )
  // The "Demo" target is setup to have BUILD_ALL_DEVICES and HOLD_AUTO_START
  // We are looking at a jumper (defined in SampleAppHw.c) to be jumpered
  // together - if they are - we will start up a coordinator. Otherwise,
  // the device will start as a router.
  if ( readCoordinatorJumper() )
    zgDeviceLogicalType = ZG_DEVICETYPE_COORDINATOR;
  else
    zgDeviceLogicalType = ZG_DEVICETYPE_ROUTER;
#endif // BUILD_ALL_DEVICES

//该段的意思是，如果设置了HOLD_AUTO_START宏定义，将会在启动芯片的时候会暂停启动
//流程，只有外部触发以后才会启动芯片。其实就是需要一个按钮触发它的启动流程。  
#if defined ( HOLD_AUTO_START )
  // HOLD_AUTO_START is a compile option that will surpress ZDApp
  //  from starting the device and wait for the application to
  //  start the device.
  ZDOInitDevice(0);
#endif

  // Setup for the periodic message's destination address 设置发送数据的方式和目的地址寻址模式
  // Broadcast to everyone 发送模式:广播发送
  SampleApp_Periodic_DstAddr.addrMode = (afAddrMode_t)AddrBroadcast;//广播
  SampleApp_Periodic_DstAddr.endPoint = SAMPLEAPP_ENDPOINT; //指定端点号
  SampleApp_Periodic_DstAddr.addr.shortAddr = 0xFFFF;//指定目的网络地址为广播地址

  // Setup for the flash command's destination address - Group 1 组播发送
  SampleApp_Flash_DstAddr.addrMode = (afAddrMode_t)afAddrGroup; //组寻址
  SampleApp_Flash_DstAddr.endPoint = SAMPLEAPP_ENDPOINT; //指定端点号
  SampleApp_Flash_DstAddr.addr.shortAddr = SAMPLEAPP_FLASH_GROUP;//组号0x0001

  // Fill out the endpoint description. 定义本设备用来通信的APS层端点描述符
  SampleApp_epDesc.endPoint = SAMPLEAPP_ENDPOINT; //指定端点号
  SampleApp_epDesc.task_id = &SampleApp_TaskID;   //SampleApp 描述符的任务ID
  SampleApp_epDesc.simpleDesc
            = (SimpleDescriptionFormat_t *)&SampleApp_SimpleDesc;//SampleApp简单描述符
  SampleApp_epDesc.latencyReq = noLatencyReqs;    //延时策略

  // Register the endpoint description with the AF
  afRegister( &SampleApp_epDesc );    //向AF层登记描述符

  // Register for all key events - This app will handle all key events
  RegisterForKeys( SampleApp_TaskID ); // 登记所有的按键事件

  // By default, all devices start out in Group 1
  SampleApp_Group.ID = 0x0001;//组号
  osal_memcpy( SampleApp_Group.name, "Group 1", 7  );//设定组名
  aps_AddGroup( SAMPLEAPP_ENDPOINT, &SampleApp_Group );//把该组登记添加到APS中

#if defined ( LCD_SUPPORTED )
  HalLcdWriteString( "SampleApp", HAL_LCD_LINE_1 ); //如果支持LCD，显示提示信息
#endif
}

/*********************************************************************
 * @fn      SampleApp_ProcessEvent
 *
 * @brief   Generic Application Task event processor.  This function
 *          is called to process all events for the task.  Events
 *          include timers, messages and any other user defined events.
 *
 * @param   task_id  - The OSAL assigned task ID.
 * @param   events - events to process.  This is a bit map and can
 *                   contain more than one event.
 *
 * @return  none
 */
//用户应用任务的事件处理函数
uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )
{
  afIncomingMSGPacket_t *MSGpkt;
  (void)task_id;  // Intentionally unreferenced parameter

  if ( events & SYS_EVENT_MSG ) //接收系统消息再进行判断
  {
    //接收属于本应用任务SampleApp的消息，以SampleApp_TaskID标记
    MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
    while ( MSGpkt )
    {
      switch ( MSGpkt->hdr.event )
      {
        // Received when a key is pressed
        case KEY_CHANGE://按键事件
          SampleApp_HandleKeys( ((keyChange_t *)MSGpkt)->state, ((keyChange_t *)MSGpkt)->keys );
          break;

        // Received when a messages is received (OTA) for this endpoint
        case AF_INCOMING_MSG_CMD://接收数据事件,调用函数AF_DataRequest()接收数据
          SampleApp_MessageMSGCB( MSGpkt );//调用回调函数对收到的数据进行处理
          break;

        // Received whenever the device changes state in the network
        case ZDO_STATE_CHANGE:
          //只要网络状态发生改变，就通过ZDO_STATE_CHANGE事件通知所有的任务。
          //同时完成对协调器，路由器，终端的设置
          SampleApp_NwkState = (devStates_t)(MSGpkt->hdr.status);
          //if ( (SampleApp_NwkState == DEV_ZB_COORD)//实验中协调器只接收数据所以取消发送事件
          if ( (SampleApp_NwkState == DEV_ROUTER) || (SampleApp_NwkState == DEV_END_DEVICE) )
          {
            // Start sending the periodic message in a regular interval.
            //这个定时器只是为发送周期信息开启的，设备启动初始化后从这里开始
            //触发第一个周期信息的发送，然后周而复始下去
            osal_start_timerEx( SampleApp_TaskID,
                              SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
                              SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT );
          }
          else
          {
            // Device is no longer in the network
          }
          break;

        default:
          break;
      }

      // Release the memory 事件处理完了，释放消息占用的内存
      osal_msg_deallocate( (uint8 *)MSGpkt );

      // Next - if one is available 指针指向下一个放在缓冲区的待处理的事件，
      //返回while ( MSGpkt )重新处理事件，直到缓冲区没有等待处理事件为止
      MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID );
    }

    // return unprocessed events 返回未处理的事件
    return (events ^ SYS_EVENT_MSG);
  }

  // Send a message out - This event is generated by a timer
  //  (setup in SampleApp_Init()).
  if ( events & SAMPLEAPP_SEND_PERIODIC_MSG_EVT )
  {
    // Send the periodic message 处理周期性事件，
    //利用SampleApp_SendPeriodicMessage()处理完当前的周期性事件，然后启动定时器
    //开启下一个周期性事情，这样一种循环下去，也即是上面说的周期性事件了，
    //可以做为传感器定时采集、上传任务
    SampleApp_SendPeriodicMessage();

    // Setup to send message again in normal period (+ a little jitter)
    osal_start_timerEx( SampleApp_TaskID, SAMPLEAPP_SEND_PERIODIC_MSG_EVT,
        (SAMPLEAPP_SEND_PERIODIC_MSG_TIMEOUT + (osal_rand() & 0x00FF)) );

    // return unprocessed events 返回未处理的事件
    return (events ^ SAMPLEAPP_SEND_PERIODIC_MSG_EVT);
  }

  // Discard unknown events
  return 0;
}

/*********************************************************************
 * Event Generation Functions
 */
/*********************************************************************
 * @fn      SampleApp_HandleKeys
 *
 * @brief   Handles all key events for this device.
 *
 * @param   shift - true if in shift/alt.
 * @param   keys - bit field for key events. Valid entries:
 *                 HAL_KEY_SW_2
 *                 HAL_KEY_SW_1
 *
 * @return  none
 */
void SampleApp_HandleKeys( uint8 shift, uint8 keys ) //此实验没有用到，后面再分析
{
  (void)shift;  // Intentionally unreferenced parameter
  
  if ( keys & HAL_KEY_SW_1 )
  {
    /* This key sends the Flash Command is sent to Group 1.
     * This device will not receive the Flash Command from this
     * device (even if it belongs to group 1).
     */
    SampleApp_SendFlashMessage( SAMPLEAPP_FLASH_DURATION );
  }

  if ( keys & HAL_KEY_SW_2 )
  {
    /* The Flashr Command is sent to Group 1.
     * This key toggles this device in and out of group 1.
     * If this device doesn't belong to group 1, this application
     * will not receive the Flash command sent to group 1.
     */
    aps_Group_t *grp;
    grp = aps_FindGroup( SAMPLEAPP_ENDPOINT, SAMPLEAPP_FLASH_GROUP );
    if ( grp )
    {
      // Remove from the group
      aps_RemoveGroup( SAMPLEAPP_ENDPOINT, SAMPLEAPP_FLASH_GROUP );
    }
    else
    {
      // Add to the flash group
      aps_AddGroup( SAMPLEAPP_ENDPOINT, &SampleApp_Group );
    }
  }
}

/*********************************************************************
 * LOCAL FUNCTIONS
 */

/*********************************************************************
 * @fn      SampleApp_MessageMSGCB
 *
 * @brief   Data message processor callback.  This function processes
 *          any incoming data - probably from other devices.  So, based
 *          on cluster ID, perform the intended action.
 *
 * @param   none
 *
 * @return  none
 */
//接收数据，参数为接收到的数据
void SampleApp_MessageMSGCB( afIncomingMSGPacket_t *pkt )
{
  uint16 flashTime;
  byte buf[3]; 

  switch ( pkt->clusterId ) //判断簇ID
  {
    case SAMPLEAPP_PERIODIC_CLUSTERID: //收到广播数据
      osal_memset(buf, 0 , 3);
      osal_memcpy(buf, pkt->cmd.Data, 2); //复制数据到缓冲区中
      
      if(buf[0]=='D' && buf[1]=='1')      //判断收到的数据是否为"D1"         
      {
          HalLedBlink(HAL_LED_1, 0, 50, 500);//如果是则Led1间隔500ms闪烁
#if defined(ZDO_COORDINATOR) //协调器收到"D1"后,返回"D1"给终端，让终端Led1也闪烁
          SampleApp_SendPeriodicMessage();
#endif
      }
      else
      {
          HalLedSet(HAL_LED_1, HAL_LED_MODE_ON);                   
      }
      break;

    case SAMPLEAPP_FLASH_CLUSTERID: //收到组播数据
      flashTime = BUILD_UINT16(pkt->cmd.Data[1], pkt->cmd.Data[2] );
      HalLedBlink( HAL_LED_4, 4, 50, (flashTime / 4) );
      break;
  }
}

/*********************************************************************
 * @fn      SampleApp_SendPeriodicMessage
 *
 * @brief   Send the periodic message.
 *
 * @param   none
 *
 * @return  none
 */
//分析发送周期信息
void SampleApp_SendPeriodicMessage( void )
{
  byte SendData[3]="D1";

  // 调用AF_DataRequest将数据无线广播出去
  if( AF_DataRequest( &SampleApp_Periodic_DstAddr,//发送目的地址＋端点地址和传送模式
                       &SampleApp_epDesc,//源(答复或确认)终端的描述（比如操作系统中任务ID等）源EP
                       SAMPLEAPP_PERIODIC_CLUSTERID, //被Profile指定的有效的集群号
                       2,       // 发送数据长度
                       SendData,// 发送数据缓冲区
                       &SampleApp_TransID,     // 任务ID号
                       AF_DISCV_ROUTE,      // 有效位掩码的发送选项
                       AF_DEFAULT_RADIUS ) == afStatus_SUCCESS )  //传送跳数，通常设置为AF_DEFAULT_RADIUS
  {
  }
  else
  {
    HalLedSet(HAL_LED_1, HAL_LED_MODE_ON);
    // Error occurred in request to send.
  }
}

/*********************************************************************
 * @fn      SampleApp_SendFlashMessage
 *
 * @brief   Send the flash message to group 1.
 *
 * @param   flashTime - in milliseconds
 *
 * @return  none
 */
void SampleApp_SendFlashMessage( uint16 flashTime ) //此实验没有用到，后面再分析
{
  uint8 buffer[3];
  buffer[0] = (uint8)(SampleAppFlashCounter++);
  buffer[1] = LO_UINT16( flashTime );
  buffer[2] = HI_UINT16( flashTime );

  if ( AF_DataRequest( &SampleApp_Flash_DstAddr, &SampleApp_epDesc,
                       SAMPLEAPP_FLASH_CLUSTERID,
                       3,
                       buffer,
                       &SampleApp_TransID,
                       AF_DISCV_ROUTE,
                       AF_DEFAULT_RADIUS ) == afStatus_SUCCESS )
  {
  }
  else
  {
    // Error occurred in request to send.
  }
}

a285051244

来人啊  来人啊

w417074951

回复【2楼】a285051244:
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不知道你现在搞懂没有，其实我早就看到你帖子，但是你的问题，我需要敲个长篇大论啊，所以一直没回，你要是还没解决，那我今天有时间的时候，给你回复把，就当练习打字了

a285051244

回复【3楼】w417074951:
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我的想法是不用讲理论的  因为资料上都有，我现在的想法是可不可以直接告诉我这个板子上哪些部分属于端口，这样我再结合 资料看看

w417074951

回复【4楼】a285051244:
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你有资料不去看，来这里问...我当初就没你这魄力，端口的话是指？endpoint？那看看这个帖子：http://blog.sina.com.cn/s/blog_7ca994b80100tsg5.html