操作系统任务初始化
void osalInitTasks( void )
{
uint8 taskID = 0;

// 分配内存，返回指向缓冲区的指针
tasksEvents = (uint16 *)osal_mem_alloc( sizeof( uint16 ) * tasksCnt);
// 设置所分配的内存空间单元值为0
osal_memset( tasksEvents, 0, (sizeof( uint16 ) * tasksCnt));

// 任务优先级由高向低依次排列，高优先级对应taskID 的值反而小
macTaskInit( taskID++ ); //macTaskInit(0) ，用户不需考虑
nwk_init( taskID++ ); //nwk_init(1)，用户不需考虑
Hal_Init( taskID++ ); //Hal_Init(2) ，用户需考虑
#if defined( MT_TASK )
MT_TaskInit( taskID++ );
#endif
APS_Init( taskID++ ); //APS_Init(3) ，用户不需考虑
#if defined ( ZIGBEE_FRAGMENTATION )
APSF_Init( taskID++ );
#endif
ZDApp_Init( taskID++ ); //ZDApp_Init(4) ，用户需考虑
#if defined ( ZIGBEE_FREQ_AGILITY ) || defined ( ZIGBEE_PANID_CONFLICT )
ZDNwkMgr_Init( taskID++ );
#endif
//用户创建的任务
SampleApp_Init( taskID ); // SampleApp_Init _Init(5) ，用户需考虑
}

用户创建的任务
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
}

enum
{
AddrNotPresent = 0, //间接传送
AddrGroup = 1, //组寻址
Addr16Bit = 2, //单点传送
Addr64Bit = 3,
AddrBroadcast = 15 //广播传送
};

//用户应用任务的事件处理函数 开始操作系统是不断查询是否有事件产生
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;
}

//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;
}
}

//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.
}
}